From 7f0ffea7bcc6fa10bad5b0bb92b517d749213c58 Mon Sep 17 00:00:00 2001
From: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>
Date: Sun, 20 Sep 2026 17:05:47 +0300
Subject: [PATCH 1/3] Add support for Python 3.15

---
 .github/workflows/test.yml              | 19 +++++++++++++++++++
 ci/templates/.github/workflows/test.yml |  1 +
 pyproject.toml                          |  1 +
 tox.ini                                 |  2 +-
 4 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 7e12f6de..0cbf7acf 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -150,6 +150,24 @@ jobs:
             python_arch: 'arm64'
             tox_env: 'py314-pytest90-xdist38-coverage713'
             os: 'macos-latest'
+          - name: 'py315-pytest90-xdist38-coverage713 (ubuntu)'
+            python: '3.15'
+            toxpython: 'python3.15'
+            python_arch: 'x64'
+            tox_env: 'py315-pytest90-xdist38-coverage713'
+            os: 'ubuntu-latest'
+          - name: 'py315-pytest90-xdist38-coverage713 (windows)'
+            python: '3.15'
+            toxpython: 'python3.15'
+            python_arch: 'x64'
+            tox_env: 'py315-pytest90-xdist38-coverage713'
+            os: 'windows-latest'
+          - name: 'py315-pytest90-xdist38-coverage713 (macos)'
+            python: '3.15'
+            toxpython: 'python3.15'
+            python_arch: 'arm64'
+            tox_env: 'py315-pytest90-xdist38-coverage713'
+            os: 'macos-latest'
           - name: 'pypy310-pytest90-xdist38-coverage713 (ubuntu)'
             python: 'pypy-3.10'
             toxpython: 'pypy3.10'
@@ -230,6 +248,7 @@ jobs:
       with:
         python-version: ${{ matrix.python }}
         architecture: ${{ matrix.python_arch }}
+        allow-prereleases: true
     - name: install dependencies
       run: |
         python -mpip install --progress-bar=off -r ci/requirements.txt
diff --git a/ci/templates/.github/workflows/test.yml b/ci/templates/.github/workflows/test.yml
index 08f90d1b..2374ed02 100644
--- a/ci/templates/.github/workflows/test.yml
+++ b/ci/templates/.github/workflows/test.yml
@@ -95,6 +95,7 @@ jobs:
       with:
         python-version: {{ '${{ matrix.python }}' }}
         architecture: {{ '${{ matrix.python_arch }}' }}
+        allow-prereleases: true
     - name: install dependencies
       run: |
         python -mpip install --progress-bar=off -r ci/requirements.txt
diff --git a/pyproject.toml b/pyproject.toml
index c1641b10..0e5e7407 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -40,6 +40,7 @@ classifiers = [
     "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: 3.13",
     "Programming Language :: Python :: 3.14",
+    "Programming Language :: Python :: 3.15",
     "Programming Language :: Python :: Implementation :: CPython",
     "Programming Language :: Python :: Implementation :: PyPy",
     "Topic :: Software Development :: Testing",
diff --git a/tox.ini b/tox.ini
index 07548537..5e920ce5 100644
--- a/tox.ini
+++ b/tox.ini
@@ -15,7 +15,7 @@ envlist =
     clean,
     check,
     docs,
-    {py310,py311,py312,py313,py314,pypy310,pypy311}-{pytest90}-{xdist38}-{coverage713},
+    {py310,py311,py312,py313,py314,py315,pypy310,pypy311}-{pytest90}-{xdist38}-{coverage713},
     {py39,pypy39}-{pytest80}-{xdist38}-{coverage710},
     report
 ignore_basepython_conflict = true

From fbd01a385fc91808c99efcf826b102aa174f23fd Mon Sep 17 00:00:00 2001
From: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>
Date: Sun, 20 Sep 2026 17:26:38 +0300
Subject: [PATCH 2/3] Drop support for EOL Python 3.9

---
 .github/workflows/test.yml | 36 ------------------------------------
 pyproject.toml             |  5 ++---
 src/pytest_cov/engine.py   |  3 +--
 tox.ini                    |  1 -
 4 files changed, 3 insertions(+), 42 deletions(-)

diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 0cbf7acf..32b59e49 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -204,42 +204,6 @@ jobs:
             python_arch: 'arm64'
             tox_env: 'pypy311-pytest90-xdist38-coverage713'
             os: 'macos-latest'
-          - name: 'py39-pytest80-xdist38-coverage710 (ubuntu)'
-            python: '3.9'
-            toxpython: 'python3.9'
-            python_arch: 'x64'
-            tox_env: 'py39-pytest80-xdist38-coverage710'
-            os: 'ubuntu-latest'
-          - name: 'py39-pytest80-xdist38-coverage710 (windows)'
-            python: '3.9'
-            toxpython: 'python3.9'
-            python_arch: 'x64'
-            tox_env: 'py39-pytest80-xdist38-coverage710'
-            os: 'windows-latest'
-          - name: 'py39-pytest80-xdist38-coverage710 (macos)'
-            python: '3.9'
-            toxpython: 'python3.9'
-            python_arch: 'arm64'
-            tox_env: 'py39-pytest80-xdist38-coverage710'
-            os: 'macos-latest'
-          - name: 'pypy39-pytest80-xdist38-coverage710 (ubuntu)'
-            python: 'pypy-3.9'
-            toxpython: 'pypy3.9'
-            python_arch: 'x64'
-            tox_env: 'pypy39-pytest80-xdist38-coverage710'
-            os: 'ubuntu-latest'
-          - name: 'pypy39-pytest80-xdist38-coverage710 (windows)'
-            python: 'pypy-3.9'
-            toxpython: 'pypy3.9'
-            python_arch: 'x64'
-            tox_env: 'pypy39-pytest80-xdist38-coverage710'
-            os: 'windows-latest'
-          - name: 'pypy39-pytest80-xdist38-coverage710 (macos)'
-            python: 'pypy-3.9'
-            toxpython: 'pypy3.9'
-            python_arch: 'arm64'
-            tox_env: 'pypy39-pytest80-xdist38-coverage710'
-            os: 'macos-latest'
     steps:
     - uses: actions/checkout@v6
       with:
diff --git a/pyproject.toml b/pyproject.toml
index 0e5e7407..b1a5326a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -8,7 +8,7 @@ dynamic = ["readme"]
 version = "7.1.0"
 description = "Pytest plugin for measuring coverage."
 license = "MIT"
-requires-python = ">=3.9"
+requires-python = ">=3.10"
 authors = [
     { name = "Marc Schlaich", email = "marc.schlaich@gmail.com" },
 ]
@@ -34,7 +34,6 @@ classifiers = [
     "Programming Language :: Python",
     "Programming Language :: Python :: 3",
     "Programming Language :: Python :: 3 :: Only",
-    "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
@@ -79,7 +78,7 @@ fragments = [
 extend-exclude = ["static", "ci/templates"]
 line-length = 140
 src = ["src", "tests"]
-target-version = "py39"
+target-version = "py310"
 
 [tool.ruff.lint.per-file-ignores]
 "ci/*" = ["S"]
diff --git a/src/pytest_cov/engine.py b/src/pytest_cov/engine.py
index a6a465fa..7187d070 100644
--- a/src/pytest_cov/engine.py
+++ b/src/pytest_cov/engine.py
@@ -10,7 +10,6 @@
 import sys
 import warnings
 from pathlib import Path
-from typing import Union
 
 import coverage
 from coverage.data import CoverageData
@@ -52,7 +51,7 @@ def ensure_topdir_wrapper(self, *args, **kwargs):
 class CovController:
     """Base class for different plugin implementations."""
 
-    def __init__(self, options: argparse.Namespace, config: Union[None, object], nodeid: Union[None, str]):
+    def __init__(self, options: argparse.Namespace, config: object | None, nodeid: str | None):
         """Get some common config used by multiple derived classes."""
         self.cov_source = options.cov_source
         self.cov_report = options.cov_report
diff --git a/tox.ini b/tox.ini
index 5e920ce5..82038b92 100644
--- a/tox.ini
+++ b/tox.ini
@@ -16,7 +16,6 @@ envlist =
     check,
     docs,
     {py310,py311,py312,py313,py314,py315,pypy310,pypy311}-{pytest90}-{xdist38}-{coverage713},
-    {py39,pypy39}-{pytest80}-{xdist38}-{coverage710},
     report
 ignore_basepython_conflict = true
 

From 0be12962077762585fadbe394efe80b189617e45 Mon Sep 17 00:00:00 2001
From: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>
Date: Sun, 20 Sep 2026 17:55:59 +0300
Subject: [PATCH 3/3] Remove unused tox vars

---
 tox.ini | 23 -----------------------
 1 file changed, 23 deletions(-)

diff --git a/tox.ini b/tox.ini
index 82038b92..10774601 100644
--- a/tox.ini
+++ b/tox.ini
@@ -26,34 +26,11 @@ setenv =
     PYTHONUNBUFFERED=yes
 
     # Use env vars for (optional) pinning of deps.
-    pytest62:  _DEP_PYTEST=pytest==6.2.5
-    pytest80:  _DEP_PYTEST=pytest==8.0.2
-    pytest81:  _DEP_PYTEST=pytest==8.1.1
-    pytest82:  _DEP_PYTEST=pytest==8.2.2
-    pytest83:  _DEP_PYTEST=pytest==8.3.5
-    pytest84:  _DEP_PYTEST=pytest==8.4.2
     pytest90:  _DEP_PYTEST=pytest==9.0.2
 
-    xdist32: _DEP_PYTESTXDIST=pytest-xdist==3.2.0
-    xdist33: _DEP_PYTESTXDIST=pytest-xdist==3.3.1
-    xdist34: _DEP_PYTESTXDIST=pytest-xdist==3.4.0
-    xdist35: _DEP_PYTESTXDIST=pytest-xdist==3.5.0
-    xdist36: _DEP_PYTESTXDIST=pytest-xdist==3.6.1
-    xdist37: _DEP_PYTESTXDIST=pytest-xdist==3.7.0
     xdist38: _DEP_PYTESTXDIST=pytest-xdist==3.8.0
     xdistdev: _DEP_PYTESTXDIST=git+https://github.com/pytest-dev/pytest-xdist.git#egg=pytest-xdist
 
-    coverage72: _DEP_COVERAGE=coverage==7.2.7
-    coverage73: _DEP_COVERAGE=coverage==7.3.4
-    coverage74: _DEP_COVERAGE=coverage==7.4.4
-    coverage75: _DEP_COVERAGE=coverage==7.5.4
-    coverage76: _DEP_COVERAGE=coverage==7.6.12
-    coverage77: _DEP_COVERAGE=coverage==7.7.1
-    coverage78: _DEP_COVERAGE=coverage==7.8.2
-    coverage79: _DEP_COVERAGE=coverage==7.9.2
-    coverage710: _DEP_COVERAGE=coverage==7.10.7
-    coverage711: _DEP_COVERAGE=coverage==7.11.3
-    coverage712: _DEP_COVERAGE=coverage==7.12.0
     coverage713: _DEP_COVERAGE=coverage==7.13.5
 
     # For testing against a coverage.py working tree.