diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c9b9786f3..be684f94b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -42,7 +42,7 @@ jobs:
         uses: shivammathur/setup-php@v2
         with:
           php-version: ${{ matrix.php-version }}
-          extensions: ast, ${{ env.PHP_EXTENSIONS }}
+          extensions: ast-1.1.3, ${{ env.PHP_EXTENSIONS }}
           ini-values: ${{ env.PHP_INI_VALUES }}
           coverage: none