diff --git a/.github/workflows/pr_tests.yml b/.github/workflows/pr_tests.yml
index cb58324..62b7829 100644
--- a/.github/workflows/pr_tests.yml
+++ b/.github/workflows/pr_tests.yml
@@ -7,7 +7,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        php_version: ["7.1", "7.4"]
+        php_version: ["7.1", "7.4", "8.1"]
     runs-on: ubuntu-latest
 
     steps: