diff --git a/ci/drupal/Dockerfile b/ci/drupal/Dockerfile
index a1eff03..407a5b7 100644
--- a/ci/drupal/Dockerfile
+++ b/ci/drupal/Dockerfile
@@ -12,6 +12,7 @@ RUN apk add --no-cache \
     # 'make cast-spell' has dependency to bash
     make \
     bash \
+    grep \
     jq \
     gnupg \
     coreutils \