diff --git a/.github/workflows/php.yml b/.github/workflows/php.yml
index 521665f9..a1937cb4 100644
--- a/.github/workflows/php.yml
+++ b/.github/workflows/php.yml
@@ -30,7 +30,7 @@ jobs:
         operating-system: [ubuntu-22.04, ubuntu-20.04, ubuntu-18.04, windows-2019, macos-latest]
         php-versions: ['5.3', '5.4', '5.5', '5.6', '7.0', '7.1', '7.2', '7.3', '7.4', '8.0', '8.1', '8.2']
     env:
-      extensions: xml, opcache, xdebug, pcov
+      extensions: xml, opcache, xdebug, pcov, gd
       key: cache-v5
     steps:
       - name: Checkout