diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 1c842e9..703500a 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -45,6 +45,13 @@ jobs:
     - name: Install tox
       run: uv tool install --with tox-gh-actions --with tox-uv tox
 
+    - name: Run tests with PyTest 9
+      run: tox
+      if: matrix.python-version != '3.8' && matrix.python-version != '3.9'
+      env:
+        PYTEST_MAJOR_VERSION: 9
+        PYTEST_PLUGINS: pytest_github_actions_annotate_failures
+
     - name: Run tests with PyTest 8
       run: tox
       env:
diff --git a/tox.ini b/tox.ini
index 55f8e1f..afd0a09 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,6 @@
 [tox]
 envlist =
-    py{38,39,310,311,312,313,314}-pytest{7,8}
+    py{38,39,310,311,312,313,314}-pytest{7,8,9}
 
 [gh-actions]
 python =
@@ -16,6 +16,7 @@ python =
 PYTEST_MAJOR_VERSION =
     7: pytest7
     8: pytest8
+    9: pytest9
 
 [testenv]
 min_version = 4.22.0
@@ -23,5 +24,6 @@ groups = test
 deps =
     pytest7: pytest>=7.0.0,<8.0.0
     pytest8: pytest>=8.0.0,<9.0.0
+    pytest9: pytest>=9.0.0,<10.0.0
 
 commands = {envpython} -m pytest {posargs}