diff --git a/docker/Dockerfile b/docker/Dockerfile
index f5e369be2..22bc42327 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -15,3 +15,4 @@ run n 14.19.1
 run stack install happy
 
 # run git restore-mtime
+run apt-get -y install gup