diff --git a/clean-registry/Dockerfile b/clean-registry/Dockerfile
index 886c796..b65b891 100644
--- a/clean-registry/Dockerfile
+++ b/clean-registry/Dockerfile
@@ -2,7 +2,8 @@ FROM python:2-alpine
 
 RUN	apk add --no-cache \
 	ca-certificates \
-	bash
+	bash \
+	parallel
 
 # Install google cloud sdk
 # Download clean-registry script