diff --git a/.github/workflows/phpunit.yml b/.github/workflows/phpunit.yml
index 8780badb..15d70608 100644
--- a/.github/workflows/phpunit.yml
+++ b/.github/workflows/phpunit.yml
@@ -23,6 +23,7 @@ jobs:
                 php-version:
                     - "7.4"
                     - "8.0"
+                    - "8.1"
                 operating-system:
                     - "ubuntu-latest"
                     - "windows-latest"