diff --git a/Dockerfile b/Dockerfile
index 3004805..061b560 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,8 @@
 FROM ubuntu:20.04
 
-RUN apt-get update && apt-get install -y openresolv iptables iproute2 wireguard
+RUN apt-get update \
+ && apt-get install -y --no-install-recommends openresolv iptables iproute2 wireguard \
+ && rm -rf /var/lib/apt/lists/*
 
 COPY entrypoint.sh /entrypoint.sh