diff --git a/docker/Dockerfile b/docker/Dockerfile
index e5bf1a22..d3e046b1 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -5,6 +5,7 @@ FROM alpine:3
 
 RUN apk add --no-cache \
 		bash \
+		diffutils \
 		dumb-init \
 		git \
 		make \