diff --git a/docs/changelog.md b/docs/changelog.md
index b32bcb6..98bee96 100644
--- a/docs/changelog.md
+++ b/docs/changelog.md
@@ -6,6 +6,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [4.2.1](https://github.com/nhairs/python-json-logger/compare/v4.2.0...v4.2.1) - UNRELEASED
 
+### Added
+- Add support for Python 3.15, PyPy 3.12
+
 ### Removed
 - `STYLE_STRING_FORMAT_REGEX`, which is no longer used to find `{` style fields. [#75](https://github.com/nhairs/python-json-logger/pull/75)
 
diff --git a/pyproject.toml b/pyproject.toml
index fe257b4..e9f4714 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -31,6 +31,7 @@ classifiers = [
     "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: 3.13",
     "Programming Language :: Python :: 3.14",
+    "Programming Language :: Python :: 3.15",
     "Topic :: System :: Logging",
     "Typing :: Typed",
 ]
diff --git a/tox.ini b/tox.ini
index 4a21c2e..aeea355 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,12 +1,12 @@
 [tox]
 requires = tox>=3,tox-uv
-envlist = py{310,311,312,313,314}, pypy{310,311}
+envlist = py{310,311,312,313,314,315}, pypy{310,311,312}
 
 [testenv]
 description = run unit tests
 dependency_groups = dev
 commands =
-    pytest tests
+    pytest tests {posargs}
 
 [testenv:format]
 description = run formatters