diff --git a/.dockerignore b/.dockerignore
index 2c78951923..9f8a22d598 100644
--- a/.dockerignore
+++ b/.dockerignore
@@ -13,6 +13,7 @@
 !pgxn/
 !proxy/
 !safekeeper/
-!vendor/postgres/
+!vendor/postgres-v14/
+!vendor/postgres-v15/
 !workspace_hack/
 !neon_local/
diff --git a/.github/actions/run-python-test-set/action.yml b/.github/actions/run-python-test-set/action.yml
index 01ddced313..f04f5d11b8 100644
--- a/.github/actions/run-python-test-set/action.yml
+++ b/.github/actions/run-python-test-set/action.yml
@@ -88,7 +88,7 @@ runs:
         # PLATFORM will be embedded in the perf test report
         # and it is needed to distinguish different environments
         export PLATFORM=${PLATFORM:-github-actions-selfhosted}
-        export POSTGRES_DISTRIB_DIR=${POSTGRES_DISTRIB_DIR:-/tmp/neon/pg_install}
+        export POSTGRES_DISTRIB_DIR=${POSTGRES_DISTRIB_DIR:-/tmp/neon/pg_install/v14}
 
         if [ "${BUILD_TYPE}" = "remote" ]; then
           export REMOTE_ENV=1
diff --git a/.github/workflows/build_and_test.yml b/.github/workflows/build_and_test.yml
index 6fae36c6e4..6eddbc3335 100644
--- a/.github/workflows/build_and_test.yml
+++ b/.github/workflows/build_and_test.yml
@@ -78,8 +78,8 @@ jobs:
           fetch-depth: 1
 
       - name: Set pg revision for caching
-        id: pg_ver
-        run: echo ::set-output name=pg_rev::$(git rev-parse HEAD:vendor/postgres)
+        id: pg_v14_rev
+        run: echo ::set-output name=pg_rev::$(git rev-parse HEAD:vendor/postgres-v14)
         shell: bash -euxo pipefail {0}
 
       # Set some environment variables used by all the steps.
@@ -124,12 +124,12 @@ jobs:
             v7-${{ runner.os }}-${{ matrix.build_type }}-cargo-${{ matrix.rust_toolchain }}-${{ hashFiles('Cargo.lock') }}
             v7-${{ runner.os }}-${{ matrix.build_type }}-cargo-${{ matrix.rust_toolchain }}-
 
-      - name: Cache postgres build
+      - name: Cache postgres v14 build
         id: cache_pg
         uses: actions/cache@v3
         with:
-          path: tmp_install/
-          key: v1-${{ runner.os }}-${{ matrix.build_type }}-pg-${{ steps.pg_ver.outputs.pg_rev }}-${{ hashFiles('Makefile') }}
+          path: pg_install/v14
+          key: v1-${{ runner.os }}-${{ matrix.build_type }}-pg-${{ steps.pg_v14_rev.outputs.pg_rev }}-${{ hashFiles('Makefile') }}
 
       - name: Build postgres
         if: steps.cache_pg.outputs.cache-hit != 'true'
@@ -192,7 +192,7 @@ jobs:
         shell: bash -euxo pipefail {0}
 
       - name: Install postgres binaries
-        run: cp -a tmp_install /tmp/neon/pg_install
+        run: cp -a pg_install /tmp/neon/pg_install
         shell: bash -euxo pipefail {0}
 
       - name: Upload Neon artifact
@@ -447,7 +447,6 @@ jobs:
   compute-node-image:
     runs-on: dev
     container: gcr.io/kaniko-project/executor:v1.9.0-debug
-
     steps:
       - name: Checkout
         uses: actions/checkout@v1 # v3 won't work with kaniko
@@ -458,18 +457,57 @@ jobs:
       - name: Configure ECR login
         run: echo "{\"credsStore\":\"ecr-login\"}" > /kaniko/.docker/config.json
 
-      - name: Kaniko build compute node with extensions
-        run: /kaniko/executor --skip-unused-stages --snapshotMode=redo --cache=true --cache-repo 369495373322.dkr.ecr.eu-central-1.amazonaws.com/cache --snapshotMode=redo --context . --dockerfile Dockerfile.compute-node --destination 369495373322.dkr.ecr.eu-central-1.amazonaws.com/compute-node:$GITHUB_RUN_ID
+        # compute-node uses postgres 14, which is default now
+        # cloud repo depends on this image name, thus duplicating it
+        # remove compute-node when cloud repo is updated
+      - name: Kaniko build compute node with extensions v14 (compatibility)
+        run: /kaniko/executor --skip-unused-stages --snapshotMode=redo --cache=true --cache-repo 369495373322.dkr.ecr.eu-central-1.amazonaws.com/cache --snapshotMode=redo --context . --dockerfile Dockerfile.compute-node-v14 --destination 369495373322.dkr.ecr.eu-central-1.amazonaws.com/compute-node:$GITHUB_RUN_ID
+
+  compute-node-image-v14:
+    runs-on: dev
+    container: gcr.io/kaniko-project/executor:v1.9.0-debug
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v1 # v3 won't work with kaniko
+        with:
+          submodules: true
+          fetch-depth: 0
+
+      - name: Configure ECR login
+        run: echo "{\"credsStore\":\"ecr-login\"}" > /kaniko/.docker/config.json
+
+      - name: Kaniko build compute node with extensions v14
+        run: /kaniko/executor --skip-unused-stages  --snapshotMode=redo --cache=true --cache-repo 369495373322.dkr.ecr.eu-central-1.amazonaws.com/cache  --context . --dockerfile Dockerfile.compute-node-v14 --destination 369495373322.dkr.ecr.eu-central-1.amazonaws.com/compute-node-v14:$GITHUB_RUN_ID
+
+
+  compute-node-image-v15:
+    runs-on: dev
+    container: gcr.io/kaniko-project/executor:v1.9.0-debug
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v1 # v3 won't work with kaniko
+        with:
+          submodules: true
+          fetch-depth: 0
+
+      - name: Configure ECR login
+        run: echo "{\"credsStore\":\"ecr-login\"}" > /kaniko/.docker/config.json
+
+      - name: Kaniko build compute node with extensions v15
+        run: /kaniko/executor --skip-unused-stages --snapshotMode=redo --cache=true --cache-repo 369495373322.dkr.ecr.eu-central-1.amazonaws.com/cache --context . --dockerfile Dockerfile.compute-node-v15 --destination 369495373322.dkr.ecr.eu-central-1.amazonaws.com/compute-node-v15:$GITHUB_RUN_ID
 
   promote-images:
     runs-on: dev
-    needs: [ neon-image, compute-node-image, compute-tools-image ]
+    needs: [ neon-image, compute-node-image, compute-node-image-v14, compute-tools-image ]
     if: github.event_name != 'workflow_dispatch'
     container: amazon/aws-cli
     strategy:
       fail-fast: false
       matrix:
-        name: [ neon, compute-node, compute-tools ]
+        # compute-node uses postgres 14, which is default now
+        # cloud repo depends on this image name, thus duplicating it
+        # remove compute-node when cloud repo is updated
+        name: [ neon, compute-node, compute-node-v14, compute-tools ]
 
     steps:
       - name: Promote image to latest
@@ -501,6 +539,9 @@ jobs:
       - name: Pull compute node image from ECR
         run: crane pull 369495373322.dkr.ecr.eu-central-1.amazonaws.com/compute-node:latest compute-node
 
+      - name: Pull compute node v14 image from ECR
+        run: crane pull 369495373322.dkr.ecr.eu-central-1.amazonaws.com/compute-node-v14:latest compute-node-v14
+
       - name: Pull rust image from ECR
         run: crane pull 369495373322.dkr.ecr.eu-central-1.amazonaws.com/rust:pinned rust
 
@@ -519,6 +560,9 @@ jobs:
       - name: Push compute node image to Docker Hub
         run: crane push compute-node neondatabase/compute-node:${{needs.tag.outputs.build-tag}}
 
+      - name: Push compute node v14 image to Docker Hub
+        run: crane push compute-node-v14 neondatabase/compute-node-v14:${{needs.tag.outputs.build-tag}}
+
       - name: Push rust image to Docker Hub
         run: crane push rust neondatabase/rust:pinned
 
@@ -530,6 +574,7 @@ jobs:
           crane tag neondatabase/neon:${{needs.tag.outputs.build-tag}} latest
           crane tag neondatabase/compute-tools:${{needs.tag.outputs.build-tag}} latest
           crane tag neondatabase/compute-node:${{needs.tag.outputs.build-tag}} latest
+          crane tag neondatabase/compute-node-v14:${{needs.tag.outputs.build-tag}} latest
 
   calculate-deploy-targets:
     runs-on: [ self-hosted, Linux, k8s-runner ]
diff --git a/.github/workflows/codestyle.yml b/.github/workflows/codestyle.yml
index b64ea8a01f..a5e31d49ee 100644
--- a/.github/workflows/codestyle.yml
+++ b/.github/workflows/codestyle.yml
@@ -27,8 +27,10 @@ jobs:
         # Rust toolchains (e.g. nightly or 1.37.0), add them here.
         rust_toolchain: [1.58]
         os: [ubuntu-latest, macos-latest]
+        # To support several Postgres versions, add them here.
+        postgres_version: [v14, v15]
     timeout-minutes: 60
-    name: run regression test suite
+    name: check codestyle rust and postgres
     runs-on: ${{ matrix.os }}
 
     steps:
@@ -61,14 +63,14 @@ jobs:
 
       - name: Set pg revision for caching
         id: pg_ver
-        run: echo ::set-output name=pg_rev::$(git rev-parse HEAD:vendor/postgres)
+        run: echo ::set-output name=pg_rev::$(git rev-parse HEAD:vendor/postgres-${{matrix.postgres_version}})
 
-      - name: Cache postgres build
+      - name: Cache postgres ${{matrix.postgres_version}} build
         id: cache_pg
         uses: actions/cache@v3
         with:
           path: |
-            tmp_install/
+            pg_install/${{matrix.postgres_version}}
           key: ${{ runner.os }}-pg-${{ steps.pg_ver.outputs.pg_rev }}
 
       - name: Set extra env for macOS
@@ -90,10 +92,10 @@ jobs:
         if: failure()
         continue-on-error: true
         run: |
-          echo '' && echo '=== config.log ===' && echo ''
-          cat tmp_install/build/config.log
-          echo '' && echo '=== configure.log ===' && echo ''
-          cat tmp_install/build/configure.log
+          echo '' && echo '=== Postgres ${{matrix.postgres_version}} config.log ===' && echo ''
+          cat pg_install/build/${{matrix.postgres_version}}/config.log
+          echo '' && echo '=== Postgres ${{matrix.postgres_version}} configure.log ===' && echo ''
+          cat pg_install/build/${{matrix.postgres_version}}/configure.log
 
       - name: Cache cargo deps
         id: cache_cargo
diff --git a/.github/workflows/pg_clients.yml b/.github/workflows/pg_clients.yml
index 95052619cd..bf14865db2 100644
--- a/.github/workflows/pg_clients.yml
+++ b/.github/workflows/pg_clients.yml
@@ -52,7 +52,7 @@ jobs:
         REMOTE_ENV: 1
         BENCHMARK_CONNSTR: "${{ secrets.BENCHMARK_STAGING_CONNSTR }}"
 
-        POSTGRES_DISTRIB_DIR: /tmp/neon/pg_install
+        POSTGRES_DISTRIB_DIR: /tmp/neon/pg_install/v14
       shell: bash -euxo pipefail {0}
       run: |
         # Test framework expects we have psql binary;
diff --git a/.gitignore b/.gitignore
index ed718c8c79..618ff2c5b9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,6 @@
+/pg_install
 /target
 /tmp_check
-/tmp_install
 /tmp_check_cli
 __pycache__/
 test_output/
diff --git a/.gitmodules b/.gitmodules
index 8975c6e2fa..23765194c1 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,4 +1,8 @@
-[submodule "vendor/postgres"]
-	path = vendor/postgres
-	url = https://github.com/zenithdb/postgres
+[submodule "vendor/postgres-v14"]
+	path = vendor/postgres-v14
+	url = https://github.com/neondatabase/postgres.git
 	branch = main
+[submodule "vendor/postgres-v15"]
+	path = vendor/postgres-v15
+	url = https://github.com/neondatabase/postgres.git
+	branch = REL_15_STABLE_neon
diff --git a/Dockerfile b/Dockerfile
index aa31e227da..d379c05051 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,20 +5,24 @@
 ARG REPOSITORY=369495373322.dkr.ecr.eu-central-1.amazonaws.com
 ARG IMAGE=rust
 ARG TAG=pinned
+# ARGs don't get replaced in RUN commands in Kaniko
+# so use hardcoded value below
+# ARG PG_VERSION=v14
 
 # Build Postgres
 FROM $REPOSITORY/$IMAGE:$TAG AS pg-build
 WORKDIR /home/nonroot
 
-COPY --chown=nonroot vendor/postgres vendor/postgres
+ARG PG_VERSION=v14
+COPY --chown=nonroot vendor/postgres-v14 vendor/postgres-v14
 COPY --chown=nonroot pgxn pgxn
 COPY --chown=nonroot Makefile Makefile
 
 ENV BUILD_TYPE release
 RUN set -e \
-    && mold -run make -j $(nproc) -s neon-pg-ext \
-    && rm -rf tmp_install/build \
-    && tar -C tmp_install -czf /home/nonroot/postgres_install.tar.gz .
+    && mold -run make -j $(nproc) -s neon-pg-ext-v14 \
+    && rm -rf pg_install/v14/build \
+    && tar -C pg_install/v14 -czf /home/nonroot/postgres_install.tar.gz .
 
 # Build zenith binaries
 FROM $REPOSITORY/$IMAGE:$TAG AS build
@@ -35,7 +39,8 @@ ARG CACHEPOT_BUCKET=neon-github-dev
 #ARG AWS_ACCESS_KEY_ID
 #ARG AWS_SECRET_ACCESS_KEY
 
-COPY --from=pg-build /home/nonroot/tmp_install/include/postgresql/server tmp_install/include/postgresql/server
+ARG PG_VERSION=v14
+COPY --from=pg-build /home/nonroot/pg_install/v14/include/postgresql/server pg_install/v14/include/postgresql/server
 COPY . .
 
 # Show build caching stats to check if it was used in the end.
@@ -64,7 +69,9 @@ COPY --from=build --chown=zenith:zenith /home/nonroot/target/release/pageserver
 COPY --from=build --chown=zenith:zenith /home/nonroot/target/release/safekeeper /usr/local/bin
 COPY --from=build --chown=zenith:zenith /home/nonroot/target/release/proxy      /usr/local/bin
 
-COPY --from=pg-build /home/nonroot/tmp_install/ /usr/local/
+# v14 is default for now
+ARG PG_VERSION=v14
+COPY --from=pg-build /home/nonroot/pg_install/v14 /usr/local/
 COPY --from=pg-build /home/nonroot/postgres_install.tar.gz /data/
 
 # By default, pageserver uses `.neon/` working directory in WORKDIR, so create one and fill it with the dummy config.
diff --git a/Dockerfile.compute-node b/Dockerfile.compute-node-v14
similarity index 98%
rename from Dockerfile.compute-node
rename to Dockerfile.compute-node-v14
index 3298032030..8ddf752191 100644
--- a/Dockerfile.compute-node
+++ b/Dockerfile.compute-node-v14
@@ -2,6 +2,7 @@ ARG TAG=pinned
 # apparently, ARGs don't get replaced in RUN commands in kaniko
 # ARG POSTGIS_VERSION=3.3.0
 # ARG PLV8_VERSION=3.1.4
+# ARG PG_VERSION=v14
 
 #
 # Layer "build-deps"
@@ -16,7 +17,7 @@ RUN apt update &&  \
 # Build Postgres from the neon postgres repository.
 #
 FROM build-deps AS pg-build
-COPY vendor/postgres postgres
+COPY vendor/postgres-v14 postgres
 RUN cd postgres && \
     ./configure CFLAGS='-O2 -g3' --enable-debug --with-uuid=ossp && \
     make MAKELEVEL=0 -j $(getconf _NPROCESSORS_ONLN) -s install && \
@@ -28,8 +29,8 @@ RUN cd postgres && \
 #
 # Layer "postgis-build"
 # Build PostGIS from the upstream PostGIS mirror.
-# 
-# PostGIS compiles against neon postgres sources without changes. Perhaps we 
+#
+# PostGIS compiles against neon postgres sources without changes. Perhaps we
 # could even use the upstream binaries, compiled against vanilla Postgres, but
 # it would require some investigation to check that it works, and also keeps
 # working in the future. So for now, we compile our own binaries.
diff --git a/Dockerfile.compute-node-v15 b/Dockerfile.compute-node-v15
new file mode 100644
index 0000000000..f949ef7680
--- /dev/null
+++ b/Dockerfile.compute-node-v15
@@ -0,0 +1,172 @@
+#
+# This file is identical to the Dockerfile.compute-node-v14 file
+# except for the version of Postgres that is built.
+#
+
+ARG TAG=pinned
+# apparently, ARGs don't get replaced in RUN commands in kaniko
+# ARG POSTGIS_VERSION=3.3.0
+# ARG PLV8_VERSION=3.1.4
+# ARG PG_VERSION=v15
+
+#
+# Layer "build-deps"
+#
+FROM debian:bullseye-slim AS build-deps
+RUN apt update &&  \
+    apt install -y git autoconf automake libtool build-essential bison flex libreadline-dev zlib1g-dev libxml2-dev \
+    libcurl4-openssl-dev libossp-uuid-dev
+
+#
+# Layer "pg-build"
+# Build Postgres from the neon postgres repository.
+#
+FROM build-deps AS pg-build
+COPY vendor/postgres-v15 postgres
+RUN cd postgres && \
+    ./configure CFLAGS='-O2 -g3' --enable-debug --with-uuid=ossp && \
+    make MAKELEVEL=0 -j $(getconf _NPROCESSORS_ONLN) -s install && \
+    make MAKELEVEL=0 -j $(getconf _NPROCESSORS_ONLN) -s -C contrib/ install && \
+    # Install headers
+    make MAKELEVEL=0 -j $(getconf _NPROCESSORS_ONLN) -s -C src/include install && \
+    make MAKELEVEL=0 -j $(getconf _NPROCESSORS_ONLN) -s -C src/interfaces/libpq install
+
+#
+# Layer "postgis-build"
+# Build PostGIS from the upstream PostGIS mirror.
+#
+# PostGIS compiles against neon postgres sources without changes. Perhaps we
+# could even use the upstream binaries, compiled against vanilla Postgres, but
+# it would require some investigation to check that it works, and also keeps
+# working in the future. So for now, we compile our own binaries.
+FROM build-deps AS postgis-build
+COPY --from=pg-build /usr/local/pgsql/ /usr/local/pgsql/
+RUN apt update && \
+    apt install -y gdal-bin libgdal-dev libprotobuf-c-dev protobuf-c-compiler xsltproc wget
+
+RUN wget https://download.osgeo.org/postgis/source/postgis-3.3.0.tar.gz && \
+    tar xvzf postgis-3.3.0.tar.gz && \
+    cd postgis-3.3.0 && \
+    ./autogen.sh && \
+    export PATH="/usr/local/pgsql/bin:$PATH" && \
+    ./configure && \
+    make -j $(getconf _NPROCESSORS_ONLN) install && \
+    cd extensions/postgis && \
+    make clean && \
+    make -j $(getconf _NPROCESSORS_ONLN) install && \
+    echo 'trusted = true' >> /usr/local/pgsql/share/extension/postgis.control && \
+    echo 'trusted = true' >> /usr/local/pgsql/share/extension/postgis_raster.control && \
+    echo 'trusted = true' >> /usr/local/pgsql/share/extension/postgis_tiger_geocoder.control && \
+    echo 'trusted = true' >> /usr/local/pgsql/share/extension/postgis_topology.control
+
+#
+# Layer "plv8-build"
+# Build plv8
+#
+FROM build-deps AS plv8-build
+COPY --from=postgis-build /usr/local/pgsql/ /usr/local/pgsql/
+RUN apt update && \
+    apt install -y git curl wget make ninja-build build-essential libncurses5 python3-dev pkg-config libc++-dev libc++abi-dev libglib2.0-dev
+
+# https://github.com/plv8/plv8/issues/475
+# Debian bullseye provides binutils 2.35 when >= 2.38 is necessary
+RUN echo "deb http://ftp.debian.org/debian testing main" >> /etc/apt/sources.list && \
+    echo "APT::Default-Release \"stable\";" > /etc/apt/apt.conf.d/default-release && \
+    apt update && \
+    apt install -y --no-install-recommends -t testing binutils
+
+RUN wget https://github.com/plv8/plv8/archive/refs/tags/v3.1.4.tar.gz && \
+    tar xvzf v3.1.4.tar.gz && \
+    cd plv8-3.1.4 && \
+    export PATH="/usr/local/pgsql/bin:$PATH" && \
+    make -j $(getconf _NPROCESSORS_ONLN) && \
+    make -j $(getconf _NPROCESSORS_ONLN) install && \
+    rm -rf /plv8-* && \
+    echo 'trusted = true' >> /usr/local/pgsql/share/extension/plv8.control
+
+#
+# Layer "neon-pg-ext-build"
+# compile neon extensions
+#
+FROM build-deps AS neon-pg-ext-build
+COPY --from=postgis-build /usr/local/pgsql/ /usr/local/pgsql/
+COPY pgxn/ pgxn/
+
+RUN make -j $(getconf _NPROCESSORS_ONLN) \
+        PG_CONFIG=/usr/local/pgsql/bin/pg_config \
+        -C pgxn/neon \
+        -s install
+
+# Compile and run the Neon-specific `compute_ctl` binary
+FROM 369495373322.dkr.ecr.eu-central-1.amazonaws.com/rust:$TAG AS compute-tools
+USER nonroot
+# Copy entire project to get Cargo.* files with proper dependencies for the whole project
+COPY --chown=nonroot . .
+RUN cd compute_tools && cargo build --locked --profile release-line-debug-size-lto
+
+#
+# Clean up postgres folder before inclusion
+#
+FROM neon-pg-ext-build AS postgres-cleanup-layer
+COPY --from=neon-pg-ext-build /usr/local/pgsql /usr/local/pgsql
+
+# Remove binaries from /bin/ that we won't use (or would manually copy & install otherwise)
+RUN cd /usr/local/pgsql/bin && rm ecpg raster2pgsql shp2pgsql pgtopo_export pgtopo_import pgsql2shp
+
+# Remove headers that we won't need anymore - we've completed installation of all extensions
+RUN rm -r /usr/local/pgsql/include
+
+# Remove now-useless PGXS src infrastructure
+RUN rm -r /usr/local/pgsql/lib/pgxs/src
+
+# Remove static postgresql libraries - all compilation is finished, so we
+# can now remove these files - they must be included in other binaries by now
+# if they were to be used by other libraries.
+RUN rm /usr/local/pgsql/lib/lib*.a
+
+#
+# Final layer
+# Put it all together into the final image
+#
+FROM debian:bullseye-slim
+# Add user postgres
+RUN mkdir /var/db && useradd -m -d /var/db/postgres postgres && \
+    echo "postgres:test_console_pass" | chpasswd && \
+    mkdir /var/db/postgres/compute && mkdir /var/db/postgres/specs && \
+    chown -R postgres:postgres /var/db/postgres && \
+    chmod 0750 /var/db/postgres/compute && \
+    echo '/usr/local/lib' >> /etc/ld.so.conf && /sbin/ldconfig
+
+# TODO: Check if we can make the extension setup more modular versus a linear build
+# currently plv8-build copies the output /usr/local/pgsql from postgis-build, etc#
+COPY --from=postgres-cleanup-layer --chown=postgres /usr/local/pgsql /usr/local
+COPY --from=compute-tools --chown=postgres /home/nonroot/target/release-line-debug-size-lto/compute_ctl /usr/local/bin/compute_ctl
+
+# Install:
+# libreadline8 for psql
+# libossp-uuid16 for extension ossp-uuid
+# libgeos, libgdal, libproj and libprotobuf-c1 for PostGIS
+# GLIBC 2.34 for plv8.
+#     Debian bullseye provides GLIBC 2.31, so we install the library from testing
+#
+# Lastly, link compute_ctl into zenith_ctl while we're at it,
+# so that we don't need to put this in another layer.
+RUN apt update &&  \
+    apt install --no-install-recommends -y \
+        libreadline8 \
+        libossp-uuid16 \
+        libgeos-c1v5 \
+        libgdal28 \
+        libproj19 \
+        libprotobuf-c1 && \
+    rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* && \
+    echo "Installing GLIBC 2.34" && \
+    echo "deb http://ftp.debian.org/debian testing main" >> /etc/apt/sources.list && \
+    echo "APT::Default-Release \"stable\";" > /etc/apt/apt.conf.d/default-release && \
+    apt update && \
+    apt install -y --no-install-recommends -t testing libc6 && \
+    rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* && \
+    ln /usr/local/bin/compute_ctl /usr/local/bin/zenith_ctl
+
+USER postgres
+ENTRYPOINT ["/usr/local/bin/compute_ctl"]
diff --git a/Dockerfile.compute-node.legacy b/Dockerfile.compute-node.legacy
index ba34e2486f..7689167156 100644
--- a/Dockerfile.compute-node.legacy
+++ b/Dockerfile.compute-node.legacy
@@ -37,7 +37,8 @@ RUN adduser postgres
 RUN mkdir /pg && chown postgres:postgres /pg
 
 # Copy source files
-COPY ./vendor/postgres /pg/
+# version 14 is default for now
+COPY ./vendor/postgres-v14 /pg/
 COPY ./pgxn /pg/
 
 # Build and install Postgres locally
diff --git a/Makefile b/Makefile
index 9d7e1497e5..0b2b097ebc 100644
--- a/Makefile
+++ b/Makefile
@@ -1,15 +1,7 @@
 ROOT_PROJECT_DIR := $(dir $(abspath $(lastword $(MAKEFILE_LIST))))
 
-# Where to install Postgres, default is ./tmp_install, maybe useful for package managers
-POSTGRES_INSTALL_DIR ?= $(ROOT_PROJECT_DIR)/tmp_install
-
-# Seccomp BPF is only available for Linux
-UNAME_S := $(shell uname -s)
-ifeq ($(UNAME_S),Linux)
-	SECCOMP = --with-libseccomp
-else
-	SECCOMP =
-endif
+# Where to install Postgres, default is ./pg_install, maybe useful for package managers
+POSTGRES_INSTALL_DIR ?= $(ROOT_PROJECT_DIR)/pg_install/
 
 #
 # We differentiate between release / debug build types using the BUILD_TYPE
@@ -28,6 +20,13 @@ else
 	$(error Bad build type '$(BUILD_TYPE)', see Makefile for options)
 endif
 
+# Seccomp BPF is only available for Linux
+UNAME_S := $(shell uname -s)
+ifeq ($(UNAME_S),Linux)
+	PG_CONFIGURE_OPTS += --with-libseccomp
+endif
+
+
 # macOS with brew-installed openssl requires explicit paths
 # It can be configured with OPENSSL_PREFIX variable
 UNAME_S := $(shell uname -s)
@@ -48,75 +47,136 @@ CARGO_CMD_PREFIX += $(if $(filter n,$(MAKEFLAGS)),,+)
 CARGO_CMD_PREFIX += CARGO_TERM_PROGRESS_WHEN=never CI=1
 
 #
-# Top level Makefile to build Zenith and PostgreSQL
+# Top level Makefile to build Neon and PostgreSQL
 #
 .PHONY: all
-all: zenith postgres neon-pg-ext
+all: neon postgres neon-pg-ext
 
-### Zenith Rust bits
+### Neon Rust bits
 #
 # The 'postgres_ffi' depends on the Postgres headers.
-.PHONY: zenith
-zenith: postgres-headers
-	+@echo "Compiling Zenith"
+.PHONY: neon
+neon: postgres-v14-headers
+	+@echo "Compiling Neon"
 	$(CARGO_CMD_PREFIX) cargo build $(CARGO_BUILD_FLAGS)
 
 ### PostgreSQL parts
-$(POSTGRES_INSTALL_DIR)/build/config.status:
-	+@echo "Configuring postgres build"
-	mkdir -p $(POSTGRES_INSTALL_DIR)/build
-	(cd $(POSTGRES_INSTALL_DIR)/build && \
-	$(ROOT_PROJECT_DIR)/vendor/postgres/configure CFLAGS='$(PG_CFLAGS)' \
+# The rules are duplicated for Postgres v14 and 15. We may want to refactor
+# to avoid the duplication in the future, but it's tolerable for now.
+#
+$(POSTGRES_INSTALL_DIR)/build/v14/config.status:
+	+@echo "Configuring Postgres v14 build"
+	mkdir -p $(POSTGRES_INSTALL_DIR)/build/v14
+	(cd $(POSTGRES_INSTALL_DIR)/build/v14 && \
+	$(ROOT_PROJECT_DIR)/vendor/postgres-v14/configure CFLAGS='$(PG_CFLAGS)' \
 		$(PG_CONFIGURE_OPTS) \
-		$(SECCOMP) \
-		--prefix=$(abspath $(POSTGRES_INSTALL_DIR)) > configure.log)
+		--prefix=$(abspath $(POSTGRES_INSTALL_DIR))/v14 > configure.log)
 
-# nicer alias for running 'configure'
-.PHONY: postgres-configure
-postgres-configure: $(POSTGRES_INSTALL_DIR)/build/config.status
+$(POSTGRES_INSTALL_DIR)/build/v15/config.status:
+	+@echo "Configuring Postgres v15 build"
+	mkdir -p $(POSTGRES_INSTALL_DIR)/build/v15
+	(cd $(POSTGRES_INSTALL_DIR)/build/v15 && \
+	$(ROOT_PROJECT_DIR)/vendor/postgres-v15/configure CFLAGS='$(PG_CFLAGS)' \
+		$(PG_CONFIGURE_OPTS) \
+		--prefix=$(abspath $(POSTGRES_INSTALL_DIR))/v15 > configure.log)
 
-# Install the PostgreSQL header files into $(POSTGRES_INSTALL_DIR)/include
-.PHONY: postgres-headers
-postgres-headers: postgres-configure
-	+@echo "Installing PostgreSQL headers"
-	$(MAKE) -C $(POSTGRES_INSTALL_DIR)/build/src/include MAKELEVEL=0 install
+# nicer alias to run 'configure'
+.PHONY: postgres-v14-configure
+postgres-v14-configure: $(POSTGRES_INSTALL_DIR)/build/v14/config.status
 
-# Compile and install PostgreSQL and contrib/neon
-.PHONY: postgres
-postgres: postgres-configure \
-		  postgres-headers # to prevent `make install` conflicts with zenith's `postgres-headers`
-	+@echo "Compiling PostgreSQL"
-	$(MAKE) -C $(POSTGRES_INSTALL_DIR)/build MAKELEVEL=0 install
-	+@echo "Compiling libpq"
-	$(MAKE) -C $(POSTGRES_INSTALL_DIR)/build/src/interfaces/libpq install
-	+@echo "Compiling pg_buffercache"
-	$(MAKE) -C $(POSTGRES_INSTALL_DIR)/build/contrib/pg_buffercache install
-	+@echo "Compiling pageinspect"
-	$(MAKE) -C $(POSTGRES_INSTALL_DIR)/build/contrib/pageinspect install
+.PHONY: postgres-v15-configure
+postgres-v15-configure: $(POSTGRES_INSTALL_DIR)/build/v15/config.status
 
-.PHONY: postgres-clean
-postgres-clean:
-	$(MAKE) -C $(POSTGRES_INSTALL_DIR)/build MAKELEVEL=0 clean
-	$(MAKE) -C $(POSTGRES_INSTALL_DIR)/build/contrib/pg_buffercache clean
-	$(MAKE) -C $(POSTGRES_INSTALL_DIR)/build/contrib/pageinspect clean
-	$(MAKE) -C $(POSTGRES_INSTALL_DIR)/build/src/interfaces/libpq clean
+# Install the PostgreSQL header files into $(POSTGRES_INSTALL_DIR)/<version>/include
+.PHONY: postgres-v14-headers
+postgres-v14-headers: postgres-v14-configure
+	+@echo "Installing PostgreSQL v14 headers"
+	$(MAKE) -C $(POSTGRES_INSTALL_DIR)/build/v14/src/include MAKELEVEL=0 install
 
-neon-pg-ext: postgres
-	+@echo "Compiling neon"
-	$(MAKE) PG_CONFIG=$(POSTGRES_INSTALL_DIR)/bin/pg_config \
-		-C $(ROOT_PROJECT_DIR)/pgxn/neon install
-	+@echo "Compiling neon_test_utils"
-	$(MAKE) PG_CONFIG=$(POSTGRES_INSTALL_DIR)/bin/pg_config \
-		-C $(ROOT_PROJECT_DIR)/pgxn/neon_test_utils install
+.PHONY: postgres-v15-headers
+postgres-v15-headers: postgres-v15-configure
+	+@echo "Installing PostgreSQL v15 headers"
+	$(MAKE) -C $(POSTGRES_INSTALL_DIR)/build/v15/src/include MAKELEVEL=0 install
+
+# Compile and install PostgreSQL
+.PHONY: postgres-v14
+postgres-v14: postgres-v14-configure \
+		  postgres-v14-headers # to prevent `make install` conflicts with neon's `postgres-headers`
+	+@echo "Compiling PostgreSQL v14"
+	$(MAKE) -C $(POSTGRES_INSTALL_DIR)/build/v14 MAKELEVEL=0 install
+	+@echo "Compiling libpq v14"
+	$(MAKE) -C $(POSTGRES_INSTALL_DIR)/build/v14/src/interfaces/libpq install
+	+@echo "Compiling pg_buffercache v14"
+	$(MAKE) -C $(POSTGRES_INSTALL_DIR)/build/v14/contrib/pg_buffercache install
+	+@echo "Compiling pageinspect v14"
+	$(MAKE) -C $(POSTGRES_INSTALL_DIR)/build/v14/contrib/pageinspect install
+
+.PHONY: postgres-v15
+postgres-v15: postgres-v15-configure \
+		  postgres-v15-headers # to prevent `make install` conflicts with neon's `postgres-headers`
+	+@echo "Compiling PostgreSQL v15"
+	$(MAKE) -C $(POSTGRES_INSTALL_DIR)/build/v15 MAKELEVEL=0 install
+	+@echo "Compiling libpq v15"
+	$(MAKE) -C $(POSTGRES_INSTALL_DIR)/build/v15/src/interfaces/libpq install
+	+@echo "Compiling pg_buffercache v15"
+	$(MAKE) -C $(POSTGRES_INSTALL_DIR)/build/v15/contrib/pg_buffercache install
+	+@echo "Compiling pageinspect v15"
+	$(MAKE) -C $(POSTGRES_INSTALL_DIR)/build/v15/contrib/pageinspect install
+
+# shorthand to build all Postgres versions
+postgres: postgres-v14 postgres-v15
+
+.PHONY: postgres-v14-clean
+postgres-v14-clean:
+	$(MAKE) -C $(POSTGRES_INSTALL_DIR)/build/v14 MAKELEVEL=0 clean
+	$(MAKE) -C $(POSTGRES_INSTALL_DIR)/build/v14/contrib/pg_buffercache clean
+	$(MAKE) -C $(POSTGRES_INSTALL_DIR)/build/v14/contrib/pageinspect clean
+	$(MAKE) -C $(POSTGRES_INSTALL_DIR)/build/v14/src/interfaces/libpq clean
+
+.PHONY: postgres-v15-clean
+postgres-v15-clean:
+	$(MAKE) -C $(POSTGRES_INSTALL_DIR)/build/v15 MAKELEVEL=0 clean
+	$(MAKE) -C $(POSTGRES_INSTALL_DIR)/build/v15/contrib/pg_buffercache clean
+	$(MAKE) -C $(POSTGRES_INSTALL_DIR)/build/v15/contrib/pageinspect clean
+	$(MAKE) -C $(POSTGRES_INSTALL_DIR)/build/v15/src/interfaces/libpq clean
+
+neon-pg-ext-v14: postgres-v14
+	+@echo "Compiling neon v14"
+	mkdir -p $(POSTGRES_INSTALL_DIR)/build/neon-v14
+	(cd $(POSTGRES_INSTALL_DIR)/build/neon-v14 && \
+	$(MAKE) PG_CONFIG=$(POSTGRES_INSTALL_DIR)/v14/bin/pg_config \
+		-f $(ROOT_PROJECT_DIR)/pgxn/neon/Makefile install)
+	+@echo "Compiling neon_test_utils" v14
+	mkdir -p $(POSTGRES_INSTALL_DIR)/build/neon-test-utils-v14
+	(cd $(POSTGRES_INSTALL_DIR)/build/neon-test-utils-v14 && \
+	$(MAKE) PG_CONFIG=$(POSTGRES_INSTALL_DIR)/v14/bin/pg_config \
+		-f $(ROOT_PROJECT_DIR)/pgxn/neon_test_utils/Makefile install)
+
+neon-pg-ext-v15: postgres-v15
+	+@echo "Compiling neon v15"
+	mkdir -p $(POSTGRES_INSTALL_DIR)/build/neon-v15
+	(cd $(POSTGRES_INSTALL_DIR)/build/neon-v15 && \
+	$(MAKE) PG_CONFIG=$(POSTGRES_INSTALL_DIR)/v15/bin/pg_config \
+		-f $(ROOT_PROJECT_DIR)/pgxn/neon/Makefile install)
+	+@echo "Compiling neon_test_utils" v15
+	mkdir -p $(POSTGRES_INSTALL_DIR)/build/neon-test-utils-v15
+	(cd $(POSTGRES_INSTALL_DIR)/build/neon-test-utils-v15 && \
+	$(MAKE) PG_CONFIG=$(POSTGRES_INSTALL_DIR)/v15/bin/pg_config \
+		-f $(ROOT_PROJECT_DIR)/pgxn/neon_test_utils/Makefile install)
 
 .PHONY: neon-pg-ext-clean
 	$(MAKE) -C $(ROOT_PROJECT_DIR)/pgxn/neon clean
 	$(MAKE) -C $(ROOT_PROJECT_DIR)/pgxn/neon_test_utils clean
 
+neon-pg-ext: neon-pg-ext-v14 neon-pg-ext-v15
+postgres-headers: postgres-v14-headers postgres-v15-headers
+postgres-clean: postgres-v14-clean postgres-v15-clean
+
 # This doesn't remove the effects of 'configure'.
 .PHONY: clean
 clean:
-	cd $(POSTGRES_INSTALL_DIR)/build && $(MAKE) clean
+	cd $(POSTGRES_INSTALL_DIR)/build/v14 && $(MAKE) clean
+	cd $(POSTGRES_INSTALL_DIR)/build/v15 && $(MAKE) clean
 	$(CARGO_CMD_PREFIX) cargo clean
 	cd pgxn/neon && $(MAKE) clean
 	cd pgxn/neon_test_utils && $(MAKE) clean
diff --git a/NOTICE b/NOTICE
index 47cc4e798f..4fbec9763b 100644
--- a/NOTICE
+++ b/NOTICE
@@ -1,5 +1,5 @@
 Neon
 Copyright 2022 Neon Inc.
 
-The PostgreSQL submodule in vendor/postgres is licensed under the
-PostgreSQL license. See vendor/postgres/COPYRIGHT.
+The PostgreSQL submodules in vendor/postgres-v14 and vendor/postgres-v15 are licensed under the
+PostgreSQL license. See vendor/postgres-v14/COPYRIGHT and vendor/postgres-v15/COPYRIGHT.
diff --git a/README.md b/README.md
index f557b19987..57d0a144cb 100644
--- a/README.md
+++ b/README.md
@@ -25,6 +25,7 @@ Pageserver consists of:
 - WAL receiver - service that receives WAL from WAL service and stores it in the repository.
 - Page service - service that communicates with compute nodes and responds with pages from the repository.
 - WAL redo - service that builds pages from base images and WAL records on Page service request
+
 ## Running local installation
 
 
@@ -101,7 +102,7 @@ make -j`sysctl -n hw.logicalcpu`
 ```
 
 #### Dependency installation notes
-To run the `psql` client, install the `postgresql-client` package or modify `PATH` and `LD_LIBRARY_PATH` to include `tmp_install/bin` and `tmp_install/lib`, respectively.
+To run the `psql` client, install the `postgresql-client` package or modify `PATH` and `LD_LIBRARY_PATH` to include `pg_install/bin` and `pg_install/lib`, respectively.
 
 To run the integration tests or Python scripts (not required to use the code), install
 Python (3.9 or higher), and install python3 packages using `./scripts/pysync` (requires [poetry](https://python-poetry.org/)) in the project directory.
@@ -208,7 +209,7 @@ Ensure your dependencies are installed as described [here](https://github.com/ne
 
 ```sh
 git clone --recursive https://github.com/neondatabase/neon.git
-make # builds also postgres and installs it to ./tmp_install
+make # builds also postgres and installs it to ./pg_install
 ./scripts/pytest
 ```
 
diff --git a/control_plane/src/local_env.rs b/control_plane/src/local_env.rs
index 75e552f6cc..c4a61dbd7b 100644
--- a/control_plane/src/local_env.rs
+++ b/control_plane/src/local_env.rs
@@ -289,13 +289,13 @@ impl LocalEnv {
         let mut env: LocalEnv = toml::from_str(toml)?;
 
         // Find postgres binaries.
-        // Follow POSTGRES_DISTRIB_DIR if set, otherwise look in "tmp_install".
+        // Follow POSTGRES_DISTRIB_DIR if set, otherwise look in "pg_install/v14".
         if env.pg_distrib_dir == Path::new("") {
             if let Some(postgres_bin) = env::var_os("POSTGRES_DISTRIB_DIR") {
                 env.pg_distrib_dir = postgres_bin.into();
             } else {
                 let cwd = env::current_dir()?;
-                env.pg_distrib_dir = cwd.join("tmp_install")
+                env.pg_distrib_dir = cwd.join("pg_install/v14")
             }
         }
 
diff --git a/docs/settings.md b/docs/settings.md
index 5a0e976b47..30db495dbe 100644
--- a/docs/settings.md
+++ b/docs/settings.md
@@ -157,7 +157,7 @@ for other files and for sockets for incoming connections.
 A directory with Postgres installation to use during pageserver activities.
 Inside that dir, a `bin/postgres` binary should be present.
 
-The default distrib dir is `./tmp_install/`.
+The default distrib dir is `./pg_install/`.
 
 #### workdir (-D)
 
diff --git a/docs/sourcetree.md b/docs/sourcetree.md
index 88f4b0e559..f3bc9230e2 100644
--- a/docs/sourcetree.md
+++ b/docs/sourcetree.md
@@ -40,15 +40,15 @@ and create new databases and accounts (control plane API in our case).
 
 Integration tests, written in Python using the `pytest` framework.
 
-`/vendor/postgres`:
+`/vendor/postgres-v14`:
 
 PostgreSQL source tree, with the modifications needed for Neon.
 
-`/vendor/postgres/contrib/neon`:
+`/pgxn/neon`:
 
 PostgreSQL extension that implements storage manager API and network communications with remote page server.
 
-`/vendor/postgres/contrib/neon_test_utils`:
+`/pgxn/neon_test_utils`:
 
 PostgreSQL extension that contains functions needed for testing and debugging.
 
diff --git a/libs/postgres_ffi/build.rs b/libs/postgres_ffi/build.rs
index 69b2711c22..19507f0557 100644
--- a/libs/postgres_ffi/build.rs
+++ b/libs/postgres_ffi/build.rs
@@ -47,14 +47,17 @@ fn main() {
     println!("cargo:rerun-if-changed=bindgen_deps.h");
 
     // Finding the location of C headers for the Postgres server:
-    // - if POSTGRES_INSTALL_DIR is set look into it, otherwise look into `<project_root>/tmp_install`
-    // - if there's a `bin/pg_config` file use it for getting include server, otherwise use `<project_root>/tmp_install/include/postgresql/server`
+    // - if POSTGRES_INSTALL_DIR is set look into it, otherwise look into `<project_root>/pg_install`
+    // - if there's a `bin/pg_config` file use it for getting include server, otherwise use `<project_root>/pg_install/v14/include/postgresql/server`
     let mut pg_install_dir = if let Some(postgres_install_dir) = env::var_os("POSTGRES_INSTALL_DIR")
     {
         postgres_install_dir.into()
     } else {
-        PathBuf::from("tmp_install")
+        PathBuf::from("pg_install")
     };
+    // Currently, we only expect to find PostgreSQL v14 sources, in "pg_install/v14". In the
+    // future, we will run this for all supported PostgreSQL versions.
+    pg_install_dir.push("v14");
 
     if pg_install_dir.is_relative() {
         let cwd = env::current_dir().unwrap();
diff --git a/libs/postgres_ffi/src/xlog_utils.rs b/libs/postgres_ffi/src/xlog_utils.rs
index e7838c3f2c..0d9aaa4708 100644
--- a/libs/postgres_ffi/src/xlog_utils.rs
+++ b/libs/postgres_ffi/src/xlog_utils.rs
@@ -449,7 +449,7 @@ mod tests {
             .join("..")
             .join("..");
         let cfg = Conf {
-            pg_distrib_dir: top_path.join("tmp_install"),
+            pg_distrib_dir: top_path.join("pg_install/v14"),
             datadir: top_path.join(format!("test_output/{}", test_name)),
         };
         if cfg.datadir.exists() {
diff --git a/libs/postgres_ffi/wal_craft/src/bin/wal_craft.rs b/libs/postgres_ffi/wal_craft/src/bin/wal_craft.rs
index 938f8f421b..2a607db6dc 100644
--- a/libs/postgres_ffi/wal_craft/src/bin/wal_craft.rs
+++ b/libs/postgres_ffi/wal_craft/src/bin/wal_craft.rs
@@ -37,7 +37,7 @@ fn main() -> Result<()> {
                     Arg::new("pg-distrib-dir")
                         .long("pg-distrib-dir")
                         .takes_value(true)
-                        .help("Directory with Postgres distribution (bin and lib directories, e.g. tmp_install)")
+                        .help("Directory with Postgres distribution (bin and lib directories, e.g. pg_install/v14)")
                         .default_value("/usr/local")
                 )
         )
diff --git a/pageserver/src/config.rs b/pageserver/src/config.rs
index c1c4169e14..fb70ea327d 100644
--- a/pageserver/src/config.rs
+++ b/pageserver/src/config.rs
@@ -205,7 +205,7 @@ impl Default for PageServerConfigBuilder {
             workdir: Set(PathBuf::new()),
             pg_distrib_dir: Set(env::current_dir()
                 .expect("cannot access current directory")
-                .join("tmp_install")),
+                .join("pg_install/v14")),
             auth_type: Set(AuthType::Trust),
             auth_validation_public_key_path: Set(None),
             remote_storage_config: Set(None),
diff --git a/pgxn/neon/inmem_smgr.c b/pgxn/neon/inmem_smgr.c
index 7840292b08..13fd4d50b6 100644
--- a/pgxn/neon/inmem_smgr.c
+++ b/pgxn/neon/inmem_smgr.c
@@ -29,6 +29,10 @@
 #include "storage/relfilenode.h"
 #include "storage/smgr.h"
 
+#if PG_VERSION_NUM >= 150000
+#include "access/xlogutils.h"
+#endif
+
 /* Size of the in-memory smgr */
 #define MAX_PAGES 64
 
diff --git a/pgxn/neon/pagestore_smgr.c b/pgxn/neon/pagestore_smgr.c
index 21d6dfec52..e3f083fd43 100644
--- a/pgxn/neon/pagestore_smgr.c
+++ b/pgxn/neon/pagestore_smgr.c
@@ -64,6 +64,11 @@
 #include "catalog/pg_tablespace_d.h"
 #include "postmaster/autovacuum.h"
 
+#if PG_VERSION_NUM >= 150000
+#include "access/xlogutils.h"
+#include "access/xlogrecovery.h"
+#endif
+
 /*
  * If DEBUG_COMPARE_LOCAL is defined, we pass through all the SMGR API
  * calls to md.c, and *also* do the calls to the Page Server. On every
@@ -645,7 +650,11 @@ zenith_get_request_lsn(bool *latest, RelFileNode rnode, ForkNumber forknum, Bloc
 		 * _bt_blwritepage logs the full page without flushing WAL before
 		 * smgrextend (files are fsynced before build ends).
 		 */
+#if PG_VERSION_NUM >= 150000
+		flushlsn = GetFlushRecPtr(NULL);
+#else
 		flushlsn = GetFlushRecPtr();
+#endif
 		if (lsn > flushlsn)
 		{
 			elog(DEBUG5, "last-written LSN %X/%X is ahead of last flushed LSN %X/%X",
diff --git a/pgxn/neon/relsize_cache.c b/pgxn/neon/relsize_cache.c
index 8dfcffe1d1..31021f3e41 100644
--- a/pgxn/neon/relsize_cache.c
+++ b/pgxn/neon/relsize_cache.c
@@ -24,6 +24,9 @@
 #include "utils/dynahash.h"
 #include "utils/guc.h"
 
+#if PG_VERSION_NUM >= 150000
+#include "miscadmin.h"
+#endif
 
 typedef struct
 {
@@ -41,6 +44,10 @@ static HTAB *relsize_hash;
 static LWLockId relsize_lock;
 static int	relsize_hash_size;
 static shmem_startup_hook_type prev_shmem_startup_hook = NULL;
+#if PG_VERSION_NUM >= 150000
+static shmem_request_hook_type prev_shmem_request_hook = NULL;
+static void relsize_shmem_request(void);
+#endif
 
 /*
  * Size of a cache entry is 20 bytes. So this default will take about 1.2 MB,
@@ -158,10 +165,31 @@ relsize_hash_init(void)
 
 	if (relsize_hash_size > 0)
 	{
+#if PG_VERSION_NUM >= 150000
+		prev_shmem_request_hook = shmem_request_hook;
+		shmem_request_hook = relsize_shmem_request;
+#else
 		RequestAddinShmemSpace(hash_estimate_size(relsize_hash_size, sizeof(RelSizeEntry)));
 		RequestNamedLWLockTranche("neon_relsize", 1);
+#endif
 
 		prev_shmem_startup_hook = shmem_startup_hook;
 		shmem_startup_hook = zenith_smgr_shmem_startup;
 	}
 }
+
+#if PG_VERSION_NUM >= 150000
+/*
+ * shmem_request hook: request additional shared resources.  We'll allocate or
+ * attach to the shared resources in zenith_smgr_shmem_startup().
+ */
+static void
+relsize_shmem_request(void)
+{
+	if (prev_shmem_request_hook)
+		prev_shmem_request_hook();
+
+	RequestAddinShmemSpace(hash_estimate_size(relsize_hash_size, sizeof(RelSizeEntry)));
+	RequestNamedLWLockTranche("neon_relsize", 1);
+}
+#endif
diff --git a/pgxn/neon/walproposer.c b/pgxn/neon/walproposer.c
index 3baa4802b0..a769a5216b 100644
--- a/pgxn/neon/walproposer.c
+++ b/pgxn/neon/walproposer.c
@@ -39,6 +39,10 @@
 #include "access/xact.h"
 #include "access/xlogdefs.h"
 #include "access/xlogutils.h"
+#include "access/xloginsert.h"
+#if PG_VERSION_NUM >= 150000
+#include "access/xlogrecovery.h"
+#endif
 #include "storage/latch.h"
 #include "miscadmin.h"
 #include "pgstat.h"
@@ -165,7 +169,10 @@ static bool backpressure_throttling_impl(void);
 
 static process_interrupts_callback_t PrevProcessInterruptsCallback;
 static shmem_startup_hook_type prev_shmem_startup_hook_type;
-
+#if PG_VERSION_NUM >= 150000
+static shmem_request_hook_type prev_shmem_request_hook = NULL;
+static void walproposer_shmem_request(void);
+#endif
 
 
 void pg_init_walproposer(void)
@@ -221,19 +228,38 @@ static void nwp_register_gucs(void)
 		GUC_UNIT_MS,
 		NULL, NULL, NULL
 	);
-	
+
 }
 
 /* shmem handling */
 
 static void nwp_prepare_shmem(void)
 {
+#if PG_VERSION_NUM >= 150000
+		prev_shmem_request_hook = shmem_request_hook;
+		shmem_request_hook = walproposer_shmem_request;
+#else
 	RequestAddinShmemSpace(WalproposerShmemSize());
-
+#endif
 	prev_shmem_startup_hook_type = shmem_startup_hook;
 	shmem_startup_hook = nwp_shmem_startup_hook;
 }
 
+#if PG_VERSION_NUM >= 150000
+/*
+ * shmem_request hook: request additional shared resources.  We'll allocate or
+ * attach to the shared resources in nwp_shmem_startup_hook().
+ */
+static void
+walproposer_shmem_request(void)
+{
+	if (prev_shmem_request_hook)
+		prev_shmem_request_hook();
+
+	RequestAddinShmemSpace(WalproposerShmemSize());
+}
+#endif
+
 static void nwp_shmem_startup_hook(void)
 {
 	if (prev_shmem_startup_hook_type)
@@ -248,6 +274,10 @@ static void nwp_shmem_startup_hook(void)
 void
 WalProposerMain(Datum main_arg)
 {
+#if PG_VERSION_NUM >= 150000
+	TimeLineID tli;
+#endif
+
 	/* Establish signal handlers. */
 	pqsignal(SIGUSR1, procsignal_sigusr1_handler);
 	pqsignal(SIGHUP, SignalHandlerForConfigReload);
@@ -255,9 +285,14 @@ WalProposerMain(Datum main_arg)
 
 	BackgroundWorkerUnblockSignals();
 
+#if PG_VERSION_NUM >= 150000
+	// FIXME pass proper tli to WalProposerInit ?
+	GetXLogReplayRecPtr(&tli);
+	WalProposerInit(GetFlushRecPtr(NULL), GetSystemIdentifier());
+#else
 	GetXLogReplayRecPtr(&ThisTimeLineID);
-
 	WalProposerInit(GetFlushRecPtr(), GetSystemIdentifier());
+#endif
 
 	last_reconnect_attempt = GetCurrentTimestamp();
 
@@ -468,7 +503,12 @@ WalProposerInitImpl(XLogRecPtr flushRecPtr, uint64 systemId)
 		!HexDecodeString(greetRequest.ztenantid, zenith_tenant_walproposer, 16))
 		elog(FATAL, "Could not parse neon.tenant_id, %s", zenith_tenant_walproposer);
 
+#if PG_VERSION_NUM >= 150000
+// FIXME don't use hardcoded timeline id
+	greetRequest.timeline = 1;
+#else
 	greetRequest.timeline = ThisTimeLineID;
+#endif
 	greetRequest.walSegSize = wal_segment_size;
 
 	InitEventSet();
@@ -1702,7 +1742,12 @@ SendAppendRequests(Safekeeper *sk)
 				 &sk->outbuf.data[sk->outbuf.len],
 				 req->beginLsn,
 				 req->endLsn - req->beginLsn,
+				 #if PG_VERSION_NUM >= 150000
+				 // FIXME don't use hardcoded timelineid here
+				 1,
+				 #else
 				 ThisTimeLineID,
+				 #endif
 				 &errinfo))
 		{
 			WALReadRaiseError(&errinfo);
@@ -2373,8 +2418,11 @@ backpressure_lag_impl(void)
 		XLogRecPtr writePtr;
 		XLogRecPtr flushPtr;
 		XLogRecPtr applyPtr;
+#if PG_VERSION_NUM >= 150000
+		XLogRecPtr myFlushLsn = GetFlushRecPtr(NULL);
+#else
 		XLogRecPtr myFlushLsn = GetFlushRecPtr();
-
+#endif
 		replication_feedback_get_lsns(&writePtr, &flushPtr, &applyPtr);
 #define MB ((XLogRecPtr)1024*1024)
 
diff --git a/pgxn/neon/walproposer_utils.c b/pgxn/neon/walproposer_utils.c
index 7b96fd580c..417a8c4586 100644
--- a/pgxn/neon/walproposer_utils.c
+++ b/pgxn/neon/walproposer_utils.c
@@ -21,6 +21,11 @@
 #include <netinet/tcp.h>
 #include <unistd.h>
 
+#if PG_VERSION_NUM >= 150000
+#include "access/xlogutils.h"
+#include "access/xlogrecovery.h"
+#endif
+
 /*
  * These variables are used similarly to openLogFile/SegNo,
  * but for walproposer to write the XLOG during recovery. walpropFileTLI is the TimeLineID
@@ -85,7 +90,11 @@ static volatile sig_atomic_t replication_active = false;
 typedef void (*WalSndSendDataCallback) (void);
 static void WalSndLoop(WalSndSendDataCallback send_data);
 static void XLogSendPhysical(void);
+#if PG_VERSION_NUM >= 150000
+static XLogRecPtr GetStandbyFlushRecPtr(TimeLineID *tli);
+#else
 static XLogRecPtr GetStandbyFlushRecPtr(void);
+#endif
 
 static void WalSndSegmentOpen(XLogReaderState *state, XLogSegNo nextSegNo,
 							  TimeLineID *tli_p);
@@ -222,10 +231,10 @@ SafekeeperStateDesiredEvents(SafekeeperState state)
 			result = WL_SOCKET_READABLE;
 			break;
 
-		/* 
+		/*
 		 * Flush states require write-ready for flushing.
 		 * Active state does both reading and writing.
-		 * 
+		 *
 		 * TODO: SS_ACTIVE sometimes doesn't need to be write-ready. We should
 		 * 	check sk->flushWrite here to set WL_SOCKET_WRITEABLE.
 		 */
@@ -398,12 +407,21 @@ XLogWalPropWrite(char *buf, Size nbytes, XLogRecPtr recptr)
 
 		if (walpropFile < 0)
 		{
+			#if PG_VERSION_NUM >= 150000
+			// FIXME Is it ok to use hardcoded value here?
+			TimeLineID tli = 1;
+			#else
 			bool		use_existent = true;
-
+			#endif
 			/* Create/use new log file */
 			XLByteToSeg(recptr, walpropSegNo, wal_segment_size);
+			#if PG_VERSION_NUM >= 150000
+			walpropFile = XLogFileInit(walpropSegNo, tli);
+			walpropFileTLI = tli;
+			#else
 			walpropFile = XLogFileInit(walpropSegNo, &use_existent, false);
 			walpropFileTLI = ThisTimeLineID;
+			#endif
 		}
 
 		/* Calculate the start offset of the received logs */
@@ -488,11 +506,14 @@ void
 StartProposerReplication(StartReplicationCmd *cmd)
 {
 	XLogRecPtr	FlushPtr;
+	TimeLineID	currTLI;
 
+	#if PG_VERSION_NUM < 150000
 	if (ThisTimeLineID == 0)
 		ereport(ERROR,
 				(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
 					errmsg("IDENTIFY_SYSTEM has not been run before START_REPLICATION")));
+	#endif
 
 	/* create xlogreader for physical replication */
 	xlogreader =
@@ -534,10 +555,19 @@ StartProposerReplication(StartReplicationCmd *cmd)
 	 * Select the timeline. If it was given explicitly by the client, use
 	 * that. Otherwise use the timeline of the last replayed record, which is
 	 * kept in ThisTimeLineID.
-	 * 
+	 *
 	 * Neon doesn't currently use PG Timelines, but it may in the future, so
 	 * we keep this code around to lighten the load for when we need it.
 	 */
+#if PG_VERSION_NUM >= 150000
+	if (am_cascading_walsender)
+	{
+		/* this also updates ThisTimeLineID */
+		FlushPtr = GetStandbyFlushRecPtr(&currTLI);
+	}
+	else
+		FlushPtr = GetFlushRecPtr(&currTLI);
+#else
 	if (am_cascading_walsender)
 	{
 		/* this also updates ThisTimeLineID */
@@ -546,12 +576,16 @@ StartProposerReplication(StartReplicationCmd *cmd)
 	else
 		FlushPtr = GetFlushRecPtr();
 
+	currTLI = ThisTimeLineID;
+#endif
+
+
 	if (cmd->timeline != 0)
 	{
 		XLogRecPtr	switchpoint;
 
 		sendTimeLine = cmd->timeline;
-		if (sendTimeLine == ThisTimeLineID)
+		if (sendTimeLine == currTLI)
 		{
 			sendTimeLineIsHistoric = false;
 			sendTimeLineValidUpto = InvalidXLogRecPtr;
@@ -566,7 +600,7 @@ StartProposerReplication(StartReplicationCmd *cmd)
 			 * Check that the timeline the client requested exists, and the
 			 * requested start location is on that timeline.
 			 */
-			timeLineHistory = readTimeLineHistory(ThisTimeLineID);
+			timeLineHistory = readTimeLineHistory(currTLI);
 			switchpoint = tliSwitchPoint(cmd->timeline, timeLineHistory,
 										 &sendTimeLineNextTLI);
 			list_free_deep(timeLineHistory);
@@ -605,7 +639,7 @@ StartProposerReplication(StartReplicationCmd *cmd)
 	}
 	else
 	{
-		sendTimeLine = ThisTimeLineID;
+		sendTimeLine = currTLI;
 		sendTimeLineValidUpto = InvalidXLogRecPtr;
 		sendTimeLineIsHistoric = false;
 	}
@@ -710,6 +744,34 @@ StartProposerReplication(StartReplicationCmd *cmd)
 	EndReplicationCommand("START_STREAMING");
 }
 
+#if PG_VERSION_NUM >= 150000
+static XLogRecPtr
+GetStandbyFlushRecPtr(TimeLineID *tli)
+{
+	XLogRecPtr	replayPtr;
+	TimeLineID	replayTLI;
+	XLogRecPtr	receivePtr;
+	TimeLineID	receiveTLI;
+	XLogRecPtr	result;
+
+	/*
+	 * We can safely send what's already been replayed. Also, if walreceiver
+	 * is streaming WAL from the same timeline, we can send anything that it
+	 * has streamed, but hasn't been replayed yet.
+	 */
+
+	receivePtr = GetWalRcvFlushRecPtr(NULL, &receiveTLI);
+	replayPtr = GetXLogReplayRecPtr(&replayTLI);
+
+	*tli = replayTLI;
+
+	result = replayPtr;
+	if (receiveTLI == replayTLI && receivePtr > replayPtr)
+		result = receivePtr;
+
+	return result;
+}
+#else
 /*
  * Returns the latest point in WAL that has been safely flushed to disk, and
  * can be sent to the standby. This should only be called when in recovery,
@@ -744,6 +806,9 @@ GetStandbyFlushRecPtr(void)
 
 	return result;
 }
+#endif
+
+
 
 /* XLogReaderRoutine->segment_open callback */
 static void
@@ -878,6 +943,7 @@ XLogSendPhysical(void)
 	XLogRecPtr	startptr;
 	XLogRecPtr	endptr;
 	Size		nbytes PG_USED_FOR_ASSERTS_ONLY;
+	TimeLineID currTLI;
 
 	/* If requested switch the WAL sender to the stopping state. */
 	if (got_STOPPING)
@@ -919,9 +985,12 @@ XLogSendPhysical(void)
 		 * FlushPtr that was calculated before it became historic.
 		 */
 		bool		becameHistoric = false;
-
+#if PG_VERSION_NUM >= 150000
+		SendRqstPtr = GetStandbyFlushRecPtr(&currTLI);
+#else
 		SendRqstPtr = GetStandbyFlushRecPtr();
-
+		currTLI = ThisTimeLineID;
+#endif
 		if (!RecoveryInProgress())
 		{
 			/*
@@ -935,10 +1004,10 @@ XLogSendPhysical(void)
 		{
 			/*
 			 * Still a cascading standby. But is the timeline we're sending
-			 * still the one recovery is recovering from? ThisTimeLineID was
+			 * still the one recovery is recovering from? currTLI was
 			 * updated by the GetStandbyFlushRecPtr() call above.
 			 */
-			if (sendTimeLine != ThisTimeLineID)
+			if (sendTimeLine != currTLI)
 				becameHistoric = true;
 		}
 
@@ -951,7 +1020,7 @@ XLogSendPhysical(void)
 			 */
 			List	   *history;
 
-			history = readTimeLineHistory(ThisTimeLineID);
+			history = readTimeLineHistory(currTLI);
 			sendTimeLineValidUpto = tliSwitchPoint(sendTimeLine, history, &sendTimeLineNextTLI);
 
 			Assert(sendTimeLine < sendTimeLineNextTLI);
@@ -974,7 +1043,11 @@ XLogSendPhysical(void)
 		 * primary: if the primary subsequently crashes and restarts, standbys
 		 * must not have applied any WAL that got lost on the primary.
 		 */
+		#if PG_VERSION_NUM >= 150000
+		SendRqstPtr = GetFlushRecPtr(NULL);
+		#else
 		SendRqstPtr = GetFlushRecPtr();
+		#endif
 	}
 
 	/*
diff --git a/test_runner/fixtures/neon_fixtures.py b/test_runner/fixtures/neon_fixtures.py
index 8ffb2eb829..b47e560325 100644
--- a/test_runner/fixtures/neon_fixtures.py
+++ b/test_runner/fixtures/neon_fixtures.py
@@ -59,7 +59,7 @@ Env = Dict[str, str]
 Fn = TypeVar("Fn", bound=Callable[..., Any])
 
 DEFAULT_OUTPUT_DIR = "test_output"
-DEFAULT_POSTGRES_DIR = "tmp_install"
+DEFAULT_POSTGRES_DIR = "pg_install/v14"
 DEFAULT_BRANCH_NAME = "main"
 
 BASE_PORT = 15000
@@ -188,7 +188,7 @@ def can_bind(host: str, port: int) -> bool:
     Check whether a host:port is available to bind for listening
 
     Inspired by the can_bind() perl function used in Postgres tests, in
-    vendor/postgres/src/test/perl/PostgresNode.pm
+    vendor/postgres-v14/src/test/perl/PostgresNode.pm
     """
     with closing(socket.socket(socket.AF_INET, socket.SOCK_STREAM)) as sock:
         # TODO: The pageserver and safekeepers don't use SO_REUSEADDR at the
diff --git a/test_runner/regress/test_pg_regress.py b/test_runner/regress/test_pg_regress.py
index 119528b8f9..aa5a65f446 100644
--- a/test_runner/regress/test_pg_regress.py
+++ b/test_runner/regress/test_pg_regress.py
@@ -26,8 +26,8 @@ def test_pg_regress(neon_simple_env: NeonEnv, test_output_dir: Path, pg_bin, cap
     (runpath / "testtablespace").mkdir(parents=True)
 
     # Compute all the file locations that pg_regress will need.
-    build_path = os.path.join(pg_distrib_dir, "build/src/test/regress")
-    src_path = os.path.join(base_dir, "vendor/postgres/src/test/regress")
+    build_path = os.path.join(pg_distrib_dir, "../build/v14/src/test/regress")
+    src_path = os.path.join(base_dir, "vendor/postgres-v14/src/test/regress")
     bindir = os.path.join(pg_distrib_dir, "bin")
     schedule = os.path.join(src_path, "parallel_schedule")
     pg_regress = os.path.join(build_path, "pg_regress")
@@ -80,8 +80,8 @@ def test_isolation(neon_simple_env: NeonEnv, test_output_dir: Path, pg_bin, caps
     (runpath / "testtablespace").mkdir(parents=True)
 
     # Compute all the file locations that pg_isolation_regress will need.
-    build_path = os.path.join(pg_distrib_dir, "build/src/test/isolation")
-    src_path = os.path.join(base_dir, "vendor/postgres/src/test/isolation")
+    build_path = os.path.join(pg_distrib_dir, "../build/v14/src/test/isolation")
+    src_path = os.path.join(base_dir, "vendor/postgres-v14/src/test/isolation")
     bindir = os.path.join(pg_distrib_dir, "bin")
     schedule = os.path.join(src_path, "isolation_schedule")
     pg_isolation_regress = os.path.join(build_path, "pg_isolation_regress")
@@ -124,7 +124,7 @@ def test_sql_regress(neon_simple_env: NeonEnv, test_output_dir: Path, pg_bin, ca
 
     # Compute all the file locations that pg_regress will need.
     # This test runs neon specific tests
-    build_path = os.path.join(pg_distrib_dir, "build/src/test/regress")
+    build_path = os.path.join(pg_distrib_dir, "../build/v14/src/test/regress")
     src_path = os.path.join(base_dir, "test_runner/sql_regress")
     bindir = os.path.join(pg_distrib_dir, "bin")
     schedule = os.path.join(src_path, "parallel_schedule")
diff --git a/vendor/postgres b/vendor/postgres-v14
similarity index 100%
rename from vendor/postgres
rename to vendor/postgres-v14
diff --git a/vendor/postgres-v15 b/vendor/postgres-v15
new file mode 160000
index 0000000000..26c6466873
--- /dev/null
+++ b/vendor/postgres-v15
@@ -0,0 +1 @@
+Subproject commit 26c64668736b729a3e4c02c6fc0a84544118df26