diff --git a/Dockerfile b/Dockerfile
index c376e72..13085cd 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,6 @@
 FROM alpine:3.10
 
-RUN apk --no-cache add git jq curl
+RUN apk --no-cache add git jq curl grep
 
 COPY entrypoint.sh /entrypoint.sh