diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 669668e..9b49848 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -30,6 +30,7 @@ jobs:
           - '3.12'
           - '3.13'
           - '3.14'
+          - '3.15'
           - 'pypy-3.10'
           - 'pypy-3.11'
         toxenv: [py]
diff --git a/CHANGELOG.md b/CHANGELOG.md
index d864a75..a6f185e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+v0.4.0 (in development)
+-----------------------
+- Support Python 3.15
+
 v0.3.0 (2025-12-05)
 -------------------
 - Support Python 3.14
diff --git a/docs/changelog.rst b/docs/changelog.rst
index 0c70193..67113eb 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -3,6 +3,11 @@
 Changelog
 =========
 
+v0.4.0 (in development)
+-----------------------
+- Support Python 3.15
+
+
 v0.3.0 (2025-12-05)
 -------------------
 - Support Python 3.14
@@ -11,10 +16,12 @@ v0.3.0 (2025-12-05)
 
     - This aligns with a bugfix in Git 2.52.0.
 
+
 v0.2.1 (2024-11-29)
 -------------------
 - Support Python 3.13
 
+
 v0.2.0 (2024-07-28)
 -------------------
 - Support Python 3.11 and 3.12
@@ -23,6 +30,7 @@ v0.2.0 (2024-07-28)
 - `Gitignore.match()` will now raise `InvalidPathError` for Windows paths with
   anchors
 
+
 v0.1.0 (2022-07-20)
 -------------------
 Initial release
diff --git a/pyproject.toml b/pyproject.toml
index 8fdcc94..8bbabe0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -30,6 +30,7 @@ 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",
     "Intended Audience :: Developers",
diff --git a/src/gitmatch/__init__.py b/src/gitmatch/__init__.py
index d574d18..6986d3d 100644
--- a/src/gitmatch/__init__.py
+++ b/src/gitmatch/__init__.py
@@ -20,7 +20,7 @@
 import sys
 from typing import Any, AnyStr, Generic
 
-__version__ = "0.3.0"
+__version__ = "0.4.0.dev1"
 __author__ = "John Thorvald Wodder II"
 __author_email__ = "gitmatch@varonathe.org"
 __license__ = "MIT"
diff --git a/tox.ini b/tox.ini
index c4811b1..7371190 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = lint,typing,py310,py311,py312,py313,py314,pypy3
+envlist = lint,typing,py310,py311,py312,py313,py314,py315,pypy3
 skip_missing_interpreters = True
 isolated_build = True
 minversion = 3.3.0