diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 351c79e7..b8990173 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -18,6 +18,13 @@ jobs:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
         python-version: [3.9, "3.10", 3.11, 3.12, 3.13, 3.14]
+        exclude:
+          - os: ubuntu-latest
+            python-version: 3.9
+        include:
+          # setup-python has no Python 3.9 build for Ubuntu 26.04.
+          - os: ubuntu-24.04
+            python-version: 3.9
 
     steps:
       - uses: actions/checkout@v6