diff --git a/Dockerfile.build b/Dockerfile.build
index b5070d05..d84fb868 100644
--- a/Dockerfile.build
+++ b/Dockerfile.build
@@ -1,3 +1,3 @@
 FROM ubuntu:focal
 
-RUN apt-get update && apt-get install -y docker.io
+RUN apt-get update && apt-get install -y docker.io rsync