diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 6ea74077..796b43dc 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -8,7 +8,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        php: ['7.3', '7.4', '8.0']
+        php: ['7.3', '7.4', '8.0', '8.1']
         dependency-version: [prefer-lowest, prefer-stable]
         parallel: ['', '--parallel']