Run all CI on 3.15

.github/workflows/diff_shades.yml

@@ -2,7 +2,7 @@ name: diff-shades
 
 on:
   push:
-    branches: [main]
+    branches: main
     paths:
       - src/**
       - pyproject.toml
@@ -44,8 +44,8 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
         with:
-          python-version: "3.14"
-          pip-version: "25.3"
+          python-version: "3.15"
+          pip-version: "26.1"
           pip-install: --group diff-shades --group diff-shades-comment
 
       - name: Calculate run configuration & metadata
@@ -74,8 +74,8 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
         with:
-          python-version: "3.14"
-          pip-version: "25.3"
+          python-version: "3.15"
+          pip-version: "26.1"
           pip-install: --group diff-shades
 
       - name: Configure git
@@ -130,8 +130,8 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
         with:
-          python-version: "3.14"
-          pip-version: "25.3"
+          python-version: "3.15"
+          pip-version: "26.1"
           pip-install: --group diff-shades
 
       - name: Configure git
@@ -179,7 +179,7 @@ jobs:
 
   compare:
     name: compare / ${{ matrix.mode }}
-    needs: ["configure", "analysis-base", "analysis-target"]
+    needs: [configure, analysis-base, analysis-target]
     if: ${{ !cancelled() }}
     runs-on: ubuntu-latest
     strategy:
@@ -199,8 +199,8 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
         with:
-          python-version: "3.14"
-          pip-version: "25.3"
+          python-version: "3.15"
+          pip-version: "26.1"
           pip-install: --group diff-shades --group diff-shades-comment
 
       - name: Generate HTML diff report

.github/workflows/diff_shades_comment.yml

@@ -81,8 +81,8 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
         with:
-          python-version: "3.14"
-          pip-version: "25.3"
+          python-version: "3.15"
+          pip-version: "26.1"
           pip-install: --group diff-shades-comment
 
       - name: Get PR number

.github/workflows/docs.yml

@@ -2,10 +2,10 @@ name: docs
 
 on:
   push:
-    paths: ["docs/**", "src/**", "pyproject.toml", ".github/workflows/docs.yml"]
+    paths: [docs/**, src/**, pyproject.toml, .github/workflows/docs.yml]
 
   pull_request:
-    paths: ["docs/**", "src/**", "pyproject.toml", ".github/workflows/docs.yml"]
+    paths: [docs/**, src/**, pyproject.toml, .github/workflows/docs.yml]
 
 permissions:
   contents: read
@@ -33,8 +33,8 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
         with:
-          python-version: "3.14"
-          pip-version: "25.3"
+          python-version: "3.15"
+          pip-version: "26.1"
           pip-install: -e .[d] --group docs
 
       - name: Build documentation

.github/workflows/fuzz.yml

@@ -24,8 +24,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        # TODO: add 3.15; relies on libcst which doesn't support 3.15 yet
-        python-version: ["3.10", "3.11", "3.12", "3.13", "3.14"]
+        python-version: ["3.10", "3.11", "3.12", "3.13", "3.14", "3.15"]
 
     steps:
       - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
@@ -37,7 +36,7 @@ jobs:
         with:
           python-version: ${{ matrix.python-version }}
           allow-prereleases: true
-          pip-version: "25.3"
+          pip-version: "26.1"
           pip-install: --group tox
 
       - name: Run fuzz tests

.github/workflows/lint.yml

@@ -30,8 +30,8 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
         with:
-          python-version: "3.14"
-          pip-version: "25.3"
+          python-version: "3.15"
+          pip-version: "26.1"
           pip-install: -e . --group tox
 
       - name: Run pre-commit hooks

.github/workflows/post_release.yml

@@ -44,8 +44,8 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
         with:
-          python-version: "3.14"
-          pip-version: "25.3"
+          python-version: "3.15"
+          pip-version: "26.1"
 
       - run: python scripts/release.py -a
 

.github/workflows/publish_binaries.yml

@@ -50,8 +50,8 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
         with:
-          python-version: "3.14"
-          pip-version: "25.3"
+          python-version: "3.15"
+          pip-version: "26.1"
           pip-install: .[colorama] --group pyinstaller
 
       - name: Build executable with PyInstaller

.github/workflows/pypi_upload.yml

@@ -26,8 +26,8 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
         with:
-          python-version: "3.14"
-          pip-version: "25.3"
+          python-version: "3.15"
+          pip-version: "26.1"
           pip-install: --group cibw
 
       - name: generate matrix
@@ -55,7 +55,7 @@ jobs:
         run: |
           {
             CIBW_BUILD="cp310-*" cibuildwheel --print-build-identifiers --platform linux | pyp 'json.dumps({"only": x, "os": "ubuntu-latest"})'
-            CIBW_BUILD="cp314-*" cibuildwheel --print-build-identifiers --platform windows | pyp 'json.dumps({"only": x, "os": "windows-latest"})'
+            CIBW_BUILD="cp315-*" cibuildwheel --print-build-identifiers --platform windows | pyp 'json.dumps({"only": x, "os": "windows-latest"})'
           } | pyp 'json.dumps(list(map(json.loads, lines)))' > /tmp/matrix
         env:
           CIBW_ARCHS_LINUX: x86_64
@@ -79,8 +79,8 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
         with:
-          python-version: "3.14"
-          pip-version: "25.3"
+          python-version: "3.15"
+          pip-version: "26.1"
           pip-install: --group cibw
 
       - name: Run cibuildwheel
@@ -104,8 +104,8 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
         with:
-          python-version: "3.14"
-          pip-version: "25.3"
+          python-version: "3.15"
+          pip-version: "26.1"
           pip-install: --group hatch
 
       - name: Build wheel and source distributions

.github/workflows/release_tests.yml

@@ -41,7 +41,7 @@ jobs:
         with:
           python-version: ${{ matrix.python-version }}
           allow-prereleases: true
-          pip-version: "25.3"
+          pip-version: "26.1"
           pip-install: --group coverage
 
       - name: Print Python Version

.github/workflows/test.yml

@@ -37,15 +37,14 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version:
-          ["3.10", "3.11", "3.12.10", "3.13", "3.14", "3.15", "pypy3.11-v7.3.22"]
+        python-version: ["3.10", "3.11", "3.12.10", "3.13", "3.14", "3.15", "pypy3.11"]
         os: [ubuntu-latest, macOS-latest, windows-latest, windows-11-arm]
         exclude:
           # setup-python only supports CPython 3.11+ on arm64 windows
           - os: windows-11-arm
             python-version: "3.10"
           - os: windows-11-arm
-            python-version: "pypy3.11-v7.3.22"
+            python-version: "pypy3.11"
 
     steps:
       - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
@@ -57,7 +56,7 @@ jobs:
         with:
           python-version: ${{ matrix.python-version }}
           allow-prereleases: true
-          pip-version: "25.3"
+          pip-version: "26.1"
           pip-install: --group tox
 
       - name: Unit tests
@@ -116,8 +115,8 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
         with:
-          python-version: "3.14"
-          pip-version: "25.3"
+          python-version: "3.15"
+          pip-version: "26.1"
           pip-install: -e .[uvloop]
 
       - name: Format ourselves

.github/workflows/zizmor.yml

@@ -2,10 +2,10 @@ name: zizmor
 
 on:
   push:
-    branches: ["main"]
-    paths: ["**.yml"]
+    branches: main
+    paths: "**.yml"
   pull_request:
-    paths: ["**.yml"]
+    paths: "**.yml"
 
 permissions: {}
 

.readthedocs.yaml

@@ -6,7 +6,7 @@ formats:
 build:
   os: ubuntu-lts-latest
   tools:
-    python: "3.13"
+    python: "3.15"
   jobs:
     install:
       - pip install --upgrade pip

CHANGES.md

@@ -13,6 +13,10 @@
 
 <!-- Include any especially major or disruptive changes here -->
 
+- Python 3.15 support (#5101)
+- Add support for unpacking in comprehensions (PEP 798) and for lazy imports (PEP 810),
+  both new syntactic features in Python 3.15 (#5048)
+
 ### Stable style
 
 <!-- Changes that affect Black's stable style -->

Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3.13-slim AS builder
+FROM python:3.15-slim AS builder
 
 RUN mkdir /src
 COPY . /src/
@@ -16,7 +16,7 @@ RUN cd /src \
     && pip install --no-cache-dir dist/*-cp* \
     && pip install black[colorama,d,uvloop]
 
-FROM python:3.13-slim
+FROM python:3.15-slim
 
 # copy only Python packages to limit the image size
 COPY --from=builder /opt/venv /opt/venv

docs/integrations/github_actions.md

@@ -67,7 +67,7 @@ requests (for example from forks), prefer setting `with.version` explicitly.
 ```yaml
 - uses: actions/setup-python@v6
   with:
-    python-version: "3.13"
+    python-version: "3.15"
 - uses: psf/black@stable
   with:
     options: "--check --verbose"

plugin/black.vim

@@ -86,6 +86,7 @@ function BlackComplete(ArgLead, CmdLine, CursorPos)
 \       'target_version=py312',
 \       'target_version=py313',
 \       'target_version=py314',
+\       'target_version=py315',
 \   ]
 endfunction