diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 9b316cc..ed637da 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -12,7 +12,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python: ["3.11", "3.12", "3.13", "3.14"]
+        python: ["3.11", "3.12", "3.13", "3.14", "3.15"]
     steps:
       - uses: actions/checkout@v4
       - uses: astral-sh/setup-uv@v6
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 46df586..0da57c0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+## 0.3.4
+
+- Python 3.15 is supported and tested in CI.
+
 ## 0.3.3
 
 - The archive download behind `mpat diff` and `mpat check --diff` treats the
diff --git a/pyproject.toml b/pyproject.toml
index dc9c01c..a39fccd 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "mpat"
-version = "0.3.3"
+version = "0.3.4"
 description = "Lockfile-based upstream drift tracking for Python monkeypatches"
 readme = "README.md"
 license = "MIT"
@@ -15,6 +15,7 @@ classifiers = [
     "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: 3.13",
     "Programming Language :: Python :: 3.14",
+    "Programming Language :: Python :: 3.15",
     "Framework :: Pytest",
 ]
 
diff --git a/src/mpat/__init__.py b/src/mpat/__init__.py
index f80b480..bc234a3 100644
--- a/src/mpat/__init__.py
+++ b/src/mpat/__init__.py
@@ -15,7 +15,7 @@
 )
 from mpat._until import Probe, Until, Version
 
-__version__ = "0.3.3"
+__version__ = "0.3.4"
 
 __all__ = [
     "AlreadyPatched",
diff --git a/tests/test_version.py b/tests/test_version.py
index d6031a2..aafb48c 100644
--- a/tests/test_version.py
+++ b/tests/test_version.py
@@ -6,4 +6,4 @@
 
 def test_version_matches_pyproject():
     data = tomllib.loads((Path(__file__).parents[1] / "pyproject.toml").read_text())
-    assert data["project"]["version"] == mpat.__version__ == "0.3.3"
+    assert data["project"]["version"] == mpat.__version__ == "0.3.4"
diff --git a/uv.lock b/uv.lock
index 519b674..154bc5b 100644
--- a/uv.lock
+++ b/uv.lock
@@ -412,7 +412,7 @@ wheels = [
 
 [[package]]
 name = "mpat"
-version = "0.3.3"
+version = "0.3.4"
 source = { editable = "." }
 dependencies = [
     { name = "packaging" },