diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 40da9fb2..7a3c535a 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -26,13 +26,13 @@ jobs:
         os:
           - ubuntu-latest
         python-version:
-          ["3.10", "3.11", "3.12", "3.13", "3.14", "3.14t", pypy3.11]
+          ["3.10", "3.11", "3.12", "3.13", "3.14", "3.15", "3.15t", pypy3.11]
         include:
           # Windows: Test lowest and highest supported Python versions
           - os: windows-latest
             python-version: "3.10"
           - os: windows-latest
-            python-version: "3.14"
+            python-version: "3.15"
 
     env:
       # Select the tox envs for this matrix entry (see `[gh]` in `tox.ini`).
@@ -54,7 +54,7 @@ jobs:
             requirements-ci.txt
 
       - name: Install tox
-        run: uv tool install --python 3.14 --with-requirements requirements-ci.txt tox
+        run: uv tool install --python 3.15 --with-requirements requirements-ci.txt tox
 
       - name: Setup test suite
         run: tox run -v --notest --skip-missing-interpreters false
diff --git a/CHANGELOG.md b/CHANGELOG.md
index e5f25414..71c9740d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,10 @@ project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
 
+### Added
+
+- Add support for Python 3.15.
+
 ### Fixed
 
 - Fix a package build deprecation warning caused by a non-string `license` value in `pyproject.toml` by [@kurtmckee] in [#648]
diff --git a/pyproject.toml b/pyproject.toml
index 1619e9d4..7dc2a711 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -27,6 +27,7 @@ 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 :: PyPy",
     "Intended Audience :: Developers",
     "Intended Audience :: System Administrators",
diff --git a/tox.ini b/tox.ini
index 7ce8f0c8..1f49dc26 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = lint,py{310,311,312,313,314,314t},pypy3,manifest,coverage-report
+envlist = lint,py{310,311,312,313,314,315,315t},pypy3,manifest,coverage-report
 
 [gh]
 python =
@@ -8,7 +8,8 @@ python =
     3.12 = py312
     3.13 = py313, lint, manifest
     3.14 = py314
-    3.14t = py314t
+    3.15 = py315
+    3.15t = py315t
     pypy3.11 = pypy3
 
 [testenv]
@@ -16,11 +17,11 @@ deps =
     pytest
     pytest-cov
     click
-    py{310,311,312,313,314,314t},pypy3: ipython
+    py{310,311,312,313,314,315,315t},pypy3: ipython
 commands = pytest --cov --cov-report=term-missing {posargs}
 depends =
-    py{310,311,312,313,314,314t},pypy3: coverage-clean
-    coverage-report: py{310,311,312,313,314,314t},pypy3
+    py{310,311,312,313,314,315,315t},pypy3: coverage-clean
+    coverage-report: py{310,311,312,313,314,315,315t},pypy3
 
 [testenv:pypy3]
 base_python = pypy3.11
@@ -33,6 +34,7 @@ deps =
 commands =
     ruff check src tests
     ruff format --check src tests
+    mypy --python-version=3.15 src tests
     mypy --python-version=3.14 src tests
     mypy --python-version=3.13 src tests
     mypy --python-version=3.12 src tests