chore: raise MSRV to 1.94.0 for lance 14

lance 14.0.0-beta.1 requires rustc 1.94.0. The 1.91.0 dependency downgrades in the MSRV job no longer apply; only aws-smithy-types needs pinning, since 1.6.1+ requires 1.94.1.

.github/workflows/rust.yml

@@ -285,7 +285,7 @@ jobs:
     runs-on: ubuntu-24.04
     strategy:
       matrix:
-        msrv: ["1.91.0"] # This should match up with rust-version in Cargo.toml
+        msrv: ["1.94.0"] # This should match up with rust-version in Cargo.toml
     env:
       # Need up-to-date compilers for kernels
       CC: clang-18
@@ -308,40 +308,9 @@ jobs:
           # unreadable outside their own branch anyway, since GitHub scopes
           # caches to the creating ref.
           save-if: ${{ github.ref == 'refs/heads/main' }}
-      - name: Downgrade  dependencies
-        # These packages have newer requirements for MSRV
-        run: |
-          cargo update -p aws-sdk-bedrockruntime --precise 1.77.0
-          cargo update -p aws-sdk-dynamodb --precise 1.68.0
-          cargo update -p aws-config --precise 1.6.0
-          cargo update -p aws-sdk-kms --precise 1.63.0
-          cargo update -p aws-sdk-s3 --precise 1.79.0
-          cargo update -p aws-sdk-sso --precise 1.62.0
-          cargo update -p aws-sdk-ssooidc --precise 1.63.0
-          cargo update -p aws-sdk-sts --precise 1.63.0
-          # aws-runtime/sigv4/credential-types/types and the aws-smithy-*
-          # crates bumped their MSRV to 1.91.1 in late 2026; pin to the last
-          # 1.91.0-compatible versions. The order matters — each downgrade
-          # only succeeds once everything that still pins it at a higher
-          # version has itself been downgraded.
-          cargo update -p aws-runtime --precise 1.5.12
-          cargo update -p aws-types --precise 1.3.9
-          cargo update -p aws-sigv4 --precise 1.3.5
-          cargo update -p aws-credential-types --precise 1.2.8
-          # aws-smithy-checksums must stay at or above 0.63.13: OpenDAL's S3
-          # service needs crc-fast ~1.9, and older releases pin it to ~1.3.
-          cargo update -p aws-smithy-checksums --precise 0.63.13
-          cargo update -p aws-smithy-runtime --precise 1.9.3
-          cargo update -p aws-smithy-http --precise 0.62.6
-          cargo update -p aws-smithy-eventstream --precise 0.60.14
-          cargo update -p aws-smithy-http-client --precise 1.1.3
-          cargo update -p aws-smithy-observability --precise 0.1.4
-          cargo update -p aws-smithy-query --precise 0.60.8
-          cargo update -p aws-smithy-runtime-api --precise 1.9.3
-          cargo update -p aws-smithy-async --precise 1.2.7
-          cargo update -p aws-smithy-types --precise 1.3.6
-          cargo update -p aws-smithy-xml --precise 0.60.11
-          cargo update -p home --precise 0.5.9
+      - name: Downgrade dependencies
+        # aws-smithy-types 1.6.1+ requires rustc 1.94.1
+        run: cargo update -p aws-smithy-types --precise 1.5.0
       - name: cargo +${{ matrix.msrv }} check
         env:
           RUSTUP_TOOLCHAIN: ${{ matrix.msrv }}

Cargo.toml

@@ -10,7 +10,7 @@ repository = "https://github.com/lancedb/lancedb"
 description = "Serverless, low-latency vector database for AI applications"
 keywords = ["lancedb", "lance", "database", "vector", "search"]
 categories = ["database-implementations"]
-rust-version = "1.91.0"
+rust-version = "1.94.0"
 
 [workspace.dependencies]
 lance = { "version" = "=14.0.0-beta.1", default-features = false, "tag" = "v14.0.0-beta.1", "git" = "https://github.com/lance-format/lance.git" }

python/Cargo.toml

@@ -8,7 +8,7 @@ license.workspace = true
 repository.workspace = true
 keywords.workspace = true
 categories.workspace = true
-rust-version = "1.91.0"
+rust-version = "1.94.0"
 
 [lib]
 name = "_lancedb"