diff --git a/.github/workflows/test-php.yml b/.github/workflows/test-php.yml
index 903b676cd..215f98741 100644
--- a/.github/workflows/test-php.yml
+++ b/.github/workflows/test-php.yml
@@ -16,7 +16,7 @@ jobs:
       uses: shivammathur/setup-php@v2
       with:
         php-version: ${{ matrix.php }}
-        extensions: gd, mbstring, json, curl, xml, mysql, ldap
+        extensions: gd, mbstring, json, curl, xml, mysql, ldap, gmp
 
     - name: Get Composer Cache Directory
       id: composer-cache