diff --git a/containers/app/Dockerfile b/containers/app/Dockerfile
index 5da3e66f21..1e71055ef2 100644
--- a/containers/app/Dockerfile
+++ b/containers/app/Dockerfile
@@ -48,7 +48,8 @@ RUN mkdir -p $FILE_STORE_PATH
 RUN mkdir -p $WORKSPACE_BASE
 
 RUN apt-get update -y \
-    && apt-get install -y curl ssh sudo
+    && apt-get install -y curl ssh sudo \
+    && rm -rf /var/lib/apt/lists/*
 
 # Default is 1000, but OSX is often 501
 RUN sed -i 's/^UID_MIN.*/UID_MIN 499/' /etc/login.defs