diff --git a/.github/workflows/on-push-to-main.yml b/.github/workflows/on-push-to-main.yml
index 45d8e61..80b0d33 100644
--- a/.github/workflows/on-push-to-main.yml
+++ b/.github/workflows/on-push-to-main.yml
@@ -47,7 +47,7 @@ jobs:
         uses: shivammathur/setup-php@v2
         with:
           php-version: '${{ matrix.php-version }}'
-          extensions: grpc
+          extensions: grpc, protobuf
           tools: composer:v2
           ini-values: zend.assertions=1