diff --git a/proto/Dockerfile b/proto/Dockerfile
index 8c4fa83a..ef6c2b23 100644
--- a/proto/Dockerfile
+++ b/proto/Dockerfile
@@ -2,7 +2,9 @@ FROM python:3.6-slim
 LABEL maintainer="jdoliner@pachyderm.io"
 
 RUN pip3 install grpcio==1.38.0 grpcio-tools==1.38.0
-RUN apt-get update && apt-get install -y gcc
+RUN apt-get update && apt-get install -y gcc \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
 RUN pip3 install "betterproto[compiler]"==2.0.0b3
 
 ADD run /bin