diff --git a/.github/workflows/build_and_test.yml b/.github/workflows/build_and_test.yml
index 78deff6e85..880d6044f2 100644
--- a/.github/workflows/build_and_test.yml
+++ b/.github/workflows/build_and_test.yml
@@ -105,11 +105,11 @@ jobs:
       - name: Install Python deps
         run: ./scripts/pysync
 
-      - name: Run ruff to ensure code format
-        run: poetry run ruff .
+      - name: Run `ruff check` to ensure code format
+        run: poetry run ruff check .
 
-      - name: Run black to ensure code format
-        run: poetry run black --diff --check .
+      - name: Run `ruff format` to ensure code format
+        run: poetry run ruff format --check .
 
       - name: Run mypy to check types
         run: poetry run mypy .
diff --git a/docs/sourcetree.md b/docs/sourcetree.md
index 95bed83ae5..12fa80349e 100644
--- a/docs/sourcetree.md
+++ b/docs/sourcetree.md
@@ -129,13 +129,13 @@ Run `poetry shell` to activate the virtual environment.
 Alternatively, use `poetry run` to run a single command in the venv, e.g. `poetry run pytest`.
 
 ### Obligatory checks
-We force code formatting via `black`, `ruff`, and type hints via `mypy`.
+We force code formatting via `ruff`, and type hints via `mypy`.
 Run the following commands in the repository's root (next to `pyproject.toml`):
 
 ```bash
-poetry run black .  # All code is reformatted
-poetry run ruff .  # Python linter
-poetry run mypy .  # Ensure there are no typing errors
+poetry run ruff format . # All code is reformatted
+poetry run ruff check .  # Python linter
+poetry run mypy .        # Ensure there are no typing errors
 ```
 
 **WARNING**: do not run `mypy` from a directory other than the root of the repository.
diff --git a/poetry.lock b/poetry.lock
index c597d811bd..428698cb5a 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,4 +1,4 @@
-# This file is automatically @generated by Poetry 1.5.1 and should not be changed by hand.
+# This file is automatically @generated by Poetry 1.7.1 and should not be changed by hand.
 
 [[package]]
 name = "aiohttp"
@@ -288,55 +288,6 @@ files = [
     {file = "backoff-2.2.1.tar.gz", hash = "sha256:03f829f5bb1923180821643f8753b0502c3b682293992485b0eef2807afa5cba"},
 ]
 
-[[package]]
-name = "black"
-version = "23.3.0"
-description = "The uncompromising code formatter."
-optional = false
-python-versions = ">=3.7"
-files = [
-    {file = "black-23.3.0-cp310-cp310-macosx_10_16_arm64.whl", hash = "sha256:0945e13506be58bf7db93ee5853243eb368ace1c08a24c65ce108986eac65915"},
-    {file = "black-23.3.0-cp310-cp310-macosx_10_16_universal2.whl", hash = "sha256:67de8d0c209eb5b330cce2469503de11bca4085880d62f1628bd9972cc3366b9"},
-    {file = "black-23.3.0-cp310-cp310-macosx_10_16_x86_64.whl", hash = "sha256:7c3eb7cea23904399866c55826b31c1f55bbcd3890ce22ff70466b907b6775c2"},
-    {file = "black-23.3.0-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:32daa9783106c28815d05b724238e30718f34155653d4d6e125dc7daec8e260c"},
-    {file = "black-23.3.0-cp310-cp310-win_amd64.whl", hash = "sha256:35d1381d7a22cc5b2be2f72c7dfdae4072a3336060635718cc7e1ede24221d6c"},
-    {file = "black-23.3.0-cp311-cp311-macosx_10_16_arm64.whl", hash = "sha256:a8a968125d0a6a404842fa1bf0b349a568634f856aa08ffaff40ae0dfa52e7c6"},
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-    {file = "black-23.3.0-cp38-cp38-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:562bd3a70495facf56814293149e51aa1be9931567474993c7942ff7d3533961"},
-    {file = "black-23.3.0-cp38-cp38-win_amd64.whl", hash = "sha256:e198cf27888ad6f4ff331ca1c48ffc038848ea9f031a3b40ba36aced7e22f2c8"},
-    {file = "black-23.3.0-cp39-cp39-macosx_10_16_arm64.whl", hash = "sha256:3238f2aacf827d18d26db07524e44741233ae09a584273aa059066d644ca7b30"},
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-    {file = "black-23.3.0-cp39-cp39-win_amd64.whl", hash = "sha256:6b39abdfb402002b8a7d030ccc85cf5afff64ee90fa4c5aebc531e3ad0175ddb"},
-    {file = "black-23.3.0-py3-none-any.whl", hash = "sha256:ec751418022185b0c1bb7d7736e6933d40bbb14c14a0abcf9123d1b159f98dd4"},
-    {file = "black-23.3.0.tar.gz", hash = "sha256:1c7b8d606e728a41ea1ccbd7264677e494e87cf630e399262ced92d4a8dac940"},
-]
-
-[package.dependencies]
-click = ">=8.0.0"
-mypy-extensions = ">=0.4.3"
-packaging = ">=22.0"
-pathspec = ">=0.9.0"
-platformdirs = ">=2"
-tomli = {version = ">=1.1.0", markers = "python_version < \"3.11\""}
-typing-extensions = {version = ">=3.10.0.0", markers = "python_version < \"3.10\""}
-
-[package.extras]
-colorama = ["colorama (>=0.4.3)"]
-d = ["aiohttp (>=3.7.4)"]
-jupyter = ["ipython (>=7.8.0)", "tokenize-rt (>=3.2.0)"]
-uvloop = ["uvloop (>=0.15.2)"]
-
 [[package]]
 name = "boto3"
 version = "1.34.11"
@@ -1627,17 +1578,6 @@ files = [
     {file = "packaging-23.0.tar.gz", hash = "sha256:b6ad297f8907de0fa2fe1ccbd26fdaf387f5f47c7275fedf8cce89f99446cf97"},
 ]
 
-[[package]]
-name = "pathspec"
-version = "0.9.0"
-description = "Utility library for gitignore style pattern matching of file paths."
-optional = false
-python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
-files = [
-    {file = "pathspec-0.9.0-py2.py3-none-any.whl", hash = "sha256:7d15c4ddb0b5c802d161efc417ec1a2558ea2653c2e8ad9c19098201dc1c993a"},
-    {file = "pathspec-0.9.0.tar.gz", hash = "sha256:e564499435a2673d586f6b2130bb5b95f04a3ba06f81b8f895b651a3c76aabb1"},
-]
-
 [[package]]
 name = "pbr"
 version = "5.9.0"
@@ -1649,21 +1589,6 @@ files = [
     {file = "pbr-5.9.0.tar.gz", hash = "sha256:e8dca2f4b43560edef58813969f52a56cef023146cbb8931626db80e6c1c4308"},
 ]
 
-[[package]]
-name = "platformdirs"
-version = "2.5.2"
-description = "A small Python module for determining appropriate platform-specific dirs, e.g. a \"user data dir\"."
-optional = false
-python-versions = ">=3.7"
-files = [
-    {file = "platformdirs-2.5.2-py3-none-any.whl", hash = "sha256:027d8e83a2d7de06bbac4e5ef7e023c02b863d7ea5d079477e722bb41ab25788"},
-    {file = "platformdirs-2.5.2.tar.gz", hash = "sha256:58c8abb07dcb441e6ee4b11d8df0ac856038f944ab98b7be6b27b2a3c7feef19"},
-]
-
-[package.extras]
-docs = ["furo (>=2021.7.5b38)", "proselint (>=0.10.2)", "sphinx (>=4)", "sphinx-autodoc-typehints (>=1.12)"]
-test = ["appdirs (==1.4.4)", "pytest (>=6)", "pytest-cov (>=2.7)", "pytest-mock (>=3.6)"]
-
 [[package]]
 name = "pluggy"
 version = "1.0.0"
@@ -2207,28 +2132,28 @@ pyasn1 = ">=0.1.3"
 
 [[package]]
 name = "ruff"
-version = "0.0.269"
-description = "An extremely fast Python linter, written in Rust."
+version = "0.1.11"
+description = "An extremely fast Python linter and code formatter, written in Rust."
 optional = false
 python-versions = ">=3.7"
 files = [
-    {file = "ruff-0.0.269-py3-none-macosx_10_7_x86_64.whl", hash = "sha256:3569bcdee679045c09c0161fabc057599759c49219a08d9a4aad2cc3982ccba3"},
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 ]
 
 [[package]]
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-    {file = "wrapt-1.14.1-cp311-cp311-win32.whl", hash = "sha256:358fe87cc899c6bb0ddc185bf3dbfa4ba646f05b1b0b9b5a27c2cb92c2cea204"},
-    {file = "wrapt-1.14.1-cp311-cp311-win_amd64.whl", hash = "sha256:26046cd03936ae745a502abf44dac702a5e6880b2b01c29aea8ddf3353b68224"},
     {file = "wrapt-1.14.1-cp35-cp35m-manylinux1_i686.whl", hash = "sha256:43ca3bbbe97af00f49efb06e352eae40434ca9d915906f77def219b88e85d907"},
     {file = "wrapt-1.14.1-cp35-cp35m-manylinux1_x86_64.whl", hash = "sha256:6b1a564e6cb69922c7fe3a678b9f9a3c54e72b469875aa8018f18b4d1dd1adf3"},
     {file = "wrapt-1.14.1-cp35-cp35m-manylinux2010_i686.whl", hash = "sha256:00b6d4ea20a906c0ca56d84f93065b398ab74b927a7a3dbd470f6fc503f95dc3"},
@@ -2743,4 +2658,4 @@ cffi = ["cffi (>=1.11)"]
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.9"
-content-hash = "8de8b05a9b35a6f76da7d7e3652ddbb521f1eca53fce7b933f537080a9d6eada"
+content-hash = "35c237fe6a9278b2dc65b06ed96bde5afb9e393d52c01b00c59acf1df3a8d482"
diff --git a/pre-commit.py b/pre-commit.py
index dc0b9ed588..c5ed63ac44 100755
--- a/pre-commit.py
+++ b/pre-commit.py
@@ -36,17 +36,17 @@ def rustfmt(fix_inplace: bool = False, no_color: bool = False) -> str:
     return cmd
 
 
-def black(fix_inplace: bool) -> str:
-    cmd = "poetry run black"
-    if not fix_inplace:
-        cmd += " --diff --check"
+def ruff_check(fix_inplace: bool) -> str:
+    cmd = "poetry run ruff check"
+    if fix_inplace:
+        cmd += " --fix"
     return cmd
 
 
-def ruff(fix_inplace: bool) -> str:
-    cmd = "poetry run ruff"
-    if fix_inplace:
-        cmd += " --fix"
+def ruff_format(fix_inplace: bool) -> str:
+    cmd = "poetry run ruff format"
+    if not fix_inplace:
+        cmd += " --diff --check"
     return cmd
 
 
@@ -109,16 +109,16 @@ if __name__ == "__main__":
         no_color=args.no_color,
     )
     check(
-        name="black",
+        name="ruff check",
         suffix=".py",
-        cmd=black(fix_inplace=args.fix_inplace),
+        cmd=ruff_check(fix_inplace=args.fix_inplace),
         changed_files=files,
         no_color=args.no_color,
     )
     check(
-        name="ruff",
+        name="ruff format",
         suffix=".py",
-        cmd=ruff(fix_inplace=args.fix_inplace),
+        cmd=ruff_format(fix_inplace=args.fix_inplace),
         changed_files=files,
         no_color=args.no_color,
     )
diff --git a/pyproject.toml b/pyproject.toml
index 18c8ece4a7..bb04123e05 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -40,22 +40,13 @@ pytest-split = "^0.8.1"
 zstandard = "^0.21.0"
 
 [tool.poetry.group.dev.dependencies]
-black = "^23.3.0"
 mypy = "==1.3.0"
-ruff = "^0.0.269"
+ruff = "^0.1.11"
 
 [build-system]
 requires = ["poetry-core>=1.0.0"]
 build-backend = "poetry.core.masonry.api"
 
-[tool.black]
-line-length = 100
-extend-exclude = '''
-/(
-    vendor
-)/
-'''
-
 [tool.mypy]
 exclude = "^vendor/"
 check_untyped_defs = true
@@ -82,7 +73,9 @@ ignore_missing_imports = true
 [tool.ruff]
 target-version = "py39"
 extend-exclude = ["vendor/"]
-ignore = ["E501"]
+ignore = [
+    "E501", # Line too long, we don't want to be too strict about it
+]
 select = [
     "E", # pycodestyle
     "F", # Pyflakes
@@ -90,3 +83,4 @@ select = [
     "W", # pycodestyle
     "B", # bugbear
 ]
+line-length = 100 # this setting is rather guidance, it won't fail if it can't make the shorter
diff --git a/scripts/export_import_between_pageservers.py b/scripts/export_import_between_pageservers.py
index ff584bd4b0..980f343047 100755
--- a/scripts/export_import_between_pageservers.py
+++ b/scripts/export_import_between_pageservers.py
@@ -63,7 +63,7 @@ def subprocess_capture(capture_dir: str, cmd: List[str], **kwargs: Any) -> str:
     If those files already exist, we will overwrite them.
     Returns basepath for files with captured output.
     """
-    assert type(cmd) is list
+    assert isinstance(cmd, list)
     base = os.path.basename(cmd[0]) + "_{}".format(global_counter())
     basepath = os.path.join(capture_dir, base)
     stdout_filename = basepath + ".stdout"
diff --git a/scripts/reformat b/scripts/reformat
index 8688044f66..3533c4dcb8 100755
--- a/scripts/reformat
+++ b/scripts/reformat
@@ -6,5 +6,5 @@ set -euox pipefail
 echo 'Reformatting Rust code'
 cargo fmt
 echo 'Reformatting Python code'
-poetry run ruff --fix test_runner scripts
-poetry run black test_runner scripts
+poetry run ruff check --fix test_runner scripts
+poetry run ruff format test_runner scripts
diff --git a/test_runner/fixtures/neon_fixtures.py b/test_runner/fixtures/neon_fixtures.py
index f33e17a76a..001d4e23a9 100644
--- a/test_runner/fixtures/neon_fixtures.py
+++ b/test_runner/fixtures/neon_fixtures.py
@@ -1101,8 +1101,8 @@ class AbstractNeonCli(abc.ABC):
         If `local_binpath` is true, then we are invoking a test utility
         """
 
-        assert type(arguments) == list
-        assert type(self.COMMAND) == str
+        assert isinstance(arguments, list)
+        assert isinstance(self.COMMAND, str)
 
         if local_binpath:
             # Test utility
diff --git a/test_runner/fixtures/pageserver/http.py b/test_runner/fixtures/pageserver/http.py
index ccacc0a987..a779dcc436 100644
--- a/test_runner/fixtures/pageserver/http.py
+++ b/test_runner/fixtures/pageserver/http.py
@@ -365,9 +365,9 @@ class PageserverHttpClient(requests.Session):
         assert isinstance(res, dict)
         assert TenantId(res["id"]) == tenant_id
         size = res["size"]
-        assert type(size) == int
+        assert isinstance(size, int)
         inputs = res["inputs"]
-        assert type(inputs) is dict
+        assert isinstance(inputs, dict)
         return (size, inputs)
 
     def tenant_size_debug(self, tenant_id: TenantId) -> str:
diff --git a/test_runner/performance/test_perf_olap.py b/test_runner/performance/test_perf_olap.py
index 1e6e9a0174..8a9509ea44 100644
--- a/test_runner/performance/test_perf_olap.py
+++ b/test_runner/performance/test_perf_olap.py
@@ -42,9 +42,10 @@ def test_clickbench_create_pg_stat_statements(remote_compare: RemoteCompare):
 # Please do not alter the label for the query, as it is used to identify it.
 # Labels for ClickBench queries match the labels in ClickBench reports
 # on https://benchmark.clickhouse.com/ (the DB size may differ).
+#
+# Disable auto formatting for the list of queries so that it's easier to read
+# fmt: off
 QUERIES: Tuple[LabelledQuery, ...] = (
-    # Disable `black` formatting for the list of queries so that it's easier to read
-    # fmt: off
     ### ClickBench queries:
     LabelledQuery("Q0",  r"SELECT COUNT(*) FROM hits;"),
     LabelledQuery("Q1",  r"SELECT COUNT(*) FROM hits WHERE AdvEngineID <> 0;"),
@@ -96,8 +97,8 @@ QUERIES: Tuple[LabelledQuery, ...] = (
     # LabelledQuery("NQ0", r"..."),
     # LabelledQuery("NQ1", r"..."),
     # ...
-    # fmt: on
 )
+# fmt: on
 
 EXPLAIN_STRING: str = "EXPLAIN (ANALYZE, VERBOSE, BUFFERS, COSTS, SETTINGS, FORMAT JSON)"
 
diff --git a/test_runner/performance/test_wal_backpressure.py b/test_runner/performance/test_wal_backpressure.py
index 3cb4b667ff..7eb244d378 100644
--- a/test_runner/performance/test_wal_backpressure.py
+++ b/test_runner/performance/test_wal_backpressure.py
@@ -32,8 +32,7 @@ def pg_compare(request) -> PgCompare:
     else:
         assert (
             len(x) == 2
-        ), f"request param ({request.param}) should have a format of \
-        `neon_{{safekeepers_enable_fsync}}`"
+        ), f"request param ({request.param}) should have a format of `neon_{{safekeepers_enable_fsync}}`"
 
         # `NeonCompare` interface
         neon_env_builder = request.getfixturevalue("neon_env_builder")
diff --git a/test_runner/regress/test_attach_tenant_config.py b/test_runner/regress/test_attach_tenant_config.py
index 32397bbcc1..ed389b1aa2 100644
--- a/test_runner/regress/test_attach_tenant_config.py
+++ b/test_runner/regress/test_attach_tenant_config.py
@@ -194,12 +194,13 @@ def test_fully_custom_config(positive_env: NeonEnv):
     assert set(our_tenant_config.effective_config.keys()) == set(
         fully_custom_config.keys()
     ), "ensure we cover all config options"
-    assert {
-        k: initial_tenant_config.effective_config[k] != our_tenant_config.effective_config[k]
-        for k in fully_custom_config.keys()
-    } == {
-        k: True for k in fully_custom_config.keys()
-    }, "ensure our custom config has different values than the default config for all config options, so we know we overrode everything"
+    assert (
+        {
+            k: initial_tenant_config.effective_config[k] != our_tenant_config.effective_config[k]
+            for k in fully_custom_config.keys()
+        }
+        == {k: True for k in fully_custom_config.keys()}
+    ), "ensure our custom config has different values than the default config for all config options, so we know we overrode everything"
 
     ps_http.tenant_detach(tenant_id)
     env.pageserver.tenant_attach(tenant_id, config=fully_custom_config)
diff --git a/test_runner/regress/test_compatibility.py b/test_runner/regress/test_compatibility.py
index 5a9c2782e6..f9d6d0a934 100644
--- a/test_runner/regress/test_compatibility.py
+++ b/test_runner/regress/test_compatibility.py
@@ -186,9 +186,7 @@ def test_backward_compatibility(
         else:
             raise
 
-    assert (
-        not breaking_changes_allowed
-    ), "Breaking changes are allowed by ALLOW_BACKWARD_COMPATIBILITY_BREAKAGE, but the test has passed without any breakage"
+    assert not breaking_changes_allowed, "Breaking changes are allowed by ALLOW_BACKWARD_COMPATIBILITY_BREAKAGE, but the test has passed without any breakage"
 
 
 @check_ondisk_data_compatibility_if_enabled
@@ -247,9 +245,7 @@ def test_forward_compatibility(
         else:
             raise
 
-    assert (
-        not breaking_changes_allowed
-    ), "Breaking changes are allowed by ALLOW_FORWARD_COMPATIBILITY_BREAKAGE, but the test has passed without any breakage"
+    assert not breaking_changes_allowed, "Breaking changes are allowed by ALLOW_FORWARD_COMPATIBILITY_BREAKAGE, but the test has passed without any breakage"
 
 
 def check_neon_works(env: NeonEnv, test_output_dir: Path, sql_dump_path: Path, repo_dir: Path):
diff --git a/test_runner/regress/test_crafted_wal_end.py b/test_runner/regress/test_crafted_wal_end.py
index 7ec901af34..01ecc2b95f 100644
--- a/test_runner/regress/test_crafted_wal_end.py
+++ b/test_runner/regress/test_crafted_wal_end.py
@@ -2,7 +2,6 @@ import pytest
 from fixtures.log_helper import log
 from fixtures.neon_fixtures import NeonEnvBuilder, WalCraft
 
-
 # Restart nodes with WAL end having specially crafted shape, like last record
 # crossing segment boundary, to test decoding issues.
 
diff --git a/test_runner/regress/test_layer_eviction.py b/test_runner/regress/test_layer_eviction.py
index 2cd2406065..efba2033fb 100644
--- a/test_runner/regress/test_layer_eviction.py
+++ b/test_runner/regress/test_layer_eviction.py
@@ -102,9 +102,7 @@ def test_basic_eviction(
         ), f"Did not expect to find {local_layer} layer after evicting"
 
     empty_layers = list(filter(lambda path: path.name != "metadata", timeline_path.glob("*")))
-    assert (
-        not empty_layers
-    ), f"After evicting all layers, timeline {tenant_id}/{timeline_id} should have no layers locally, but got: {empty_layers}"
+    assert not empty_layers, f"After evicting all layers, timeline {tenant_id}/{timeline_id} should have no layers locally, but got: {empty_layers}"
 
     evicted_layer_map_info = client.layer_map_info(tenant_id=tenant_id, timeline_id=timeline_id)
     assert (
diff --git a/test_runner/regress/test_pageserver_api.py b/test_runner/regress/test_pageserver_api.py
index 573d2139ce..e29db1e252 100644
--- a/test_runner/regress/test_pageserver_api.py
+++ b/test_runner/regress/test_pageserver_api.py
@@ -145,8 +145,7 @@ def expect_updated_msg_lsn(
     last_msg_lsn = Lsn(timeline_details["last_received_msg_lsn"])
     assert (
         prev_msg_lsn is None or prev_msg_lsn < last_msg_lsn
-    ), f"the last received message's LSN {last_msg_lsn} hasn't been updated \
-        compared to the previous message's LSN {prev_msg_lsn}"
+    ), f"the last received message's LSN {last_msg_lsn} hasn't been updated compared to the previous message's LSN {prev_msg_lsn}"
 
     return last_msg_lsn
 
diff --git a/test_runner/regress/test_tenant_detach.py b/test_runner/regress/test_tenant_detach.py
index 0dcbb23ad4..c6dbc77885 100644
--- a/test_runner/regress/test_tenant_detach.py
+++ b/test_runner/regress/test_tenant_detach.py
@@ -391,8 +391,7 @@ def test_tenant_detach_ignored_tenant(neon_simple_env: NeonEnv):
     tenants_after_detach = [tenant["id"] for tenant in client.tenant_list()]
     assert (
         tenant_id not in tenants_after_detach
-    ), f"Ignored and then detached tenant {tenant_id} \
-        should not be present in pageserver's memory"
+    ), f"Ignored and then detached tenant {tenant_id} should not be present in pageserver's memory"
 
 
 # Creates a tenant, and detaches it with extra paremeter that forces ignored tenant detach.
@@ -430,8 +429,7 @@ def test_tenant_detach_regular_tenant(neon_simple_env: NeonEnv):
     tenants_after_detach = [tenant["id"] for tenant in client.tenant_list()]
     assert (
         tenant_id not in tenants_after_detach
-    ), f"Ignored and then detached tenant {tenant_id} \
-        should not be present in pageserver's memory"
+    ), f"Ignored and then detached tenant {tenant_id} should not be present in pageserver's memory"
 
 
 def test_detach_while_attaching(
@@ -817,9 +815,7 @@ def test_metrics_while_ignoring_broken_tenant_and_reloading(
         if found_broken:
             break
         time.sleep(0.5)
-    assert (
-        found_broken
-    ), f"broken should still be in set, but it is not in the tenant state count: broken={broken}, broken_set={broken_set}"
+    assert found_broken, f"broken should still be in set, but it is not in the tenant state count: broken={broken}, broken_set={broken_set}"
 
     env.pageserver.tenant_load(env.initial_tenant)
 
@@ -837,6 +833,4 @@ def test_metrics_while_ignoring_broken_tenant_and_reloading(
             break
         time.sleep(0.5)
 
-    assert (
-        found_active
-    ), f"reloaded tenant should be active, and broken tenant set item removed: active={active}, broken_set={broken_set}"
+    assert found_active, f"reloaded tenant should be active, and broken tenant set item removed: active={active}, broken_set={broken_set}"
diff --git a/test_runner/regress/test_tenant_relocation.py b/test_runner/regress/test_tenant_relocation.py
index dcd7232b1b..1887bca23b 100644
--- a/test_runner/regress/test_tenant_relocation.py
+++ b/test_runner/regress/test_tenant_relocation.py
@@ -161,12 +161,10 @@ def switch_pg_to_new_pageserver(
     files_before_detach = os.listdir(timeline_to_detach_local_path)
     assert (
         "metadata" in files_before_detach
-    ), f"Regular timeline {timeline_to_detach_local_path} should have the metadata file,\
-            but got: {files_before_detach}"
+    ), f"Regular timeline {timeline_to_detach_local_path} should have the metadata file, but got: {files_before_detach}"
     assert (
         len(files_before_detach) >= 2
-    ), f"Regular timeline {timeline_to_detach_local_path} should have at least one layer file,\
-            but got {files_before_detach}"
+    ), f"Regular timeline {timeline_to_detach_local_path} should have at least one layer file, but got {files_before_detach}"
 
     return timeline_to_detach_local_path
 
diff --git a/test_runner/regress/test_tenants_with_remote_storage.py b/test_runner/regress/test_tenants_with_remote_storage.py
index 07fb6dc5ca..6f05d7f7cb 100644
--- a/test_runner/regress/test_tenants_with_remote_storage.py
+++ b/test_runner/regress/test_tenants_with_remote_storage.py
@@ -201,8 +201,8 @@ def test_tenants_attached_after_download(neon_env_builder: NeonEnvBuilder):
         len(restored_timelines) == 1
     ), f"Tenant {tenant_id} should have its timeline reattached after its layer is downloaded from the remote storage"
     restored_timeline = restored_timelines[0]
-    assert restored_timeline["timeline_id"] == str(
-        timeline_id
+    assert (
+        restored_timeline["timeline_id"] == str(timeline_id)
     ), f"Tenant {tenant_id} should have its old timeline {timeline_id} restored from the remote storage"
 
     # Check that we had to retry the downloads
@@ -280,8 +280,8 @@ def test_tenant_redownloads_truncated_file_on_startup(
         len(restored_timelines) == 1
     ), f"Tenant {tenant_id} should have its timeline reattached after its layer is downloaded from the remote storage"
     retored_timeline = restored_timelines[0]
-    assert retored_timeline["timeline_id"] == str(
-        timeline_id
+    assert (
+        retored_timeline["timeline_id"] == str(timeline_id)
     ), f"Tenant {tenant_id} should have its old timeline {timeline_id} restored from the remote storage"
 
     # Request non-incremental logical size. Calculating it needs the layer file that