diff --git a/Dockerfile b/Dockerfile
index a3f8457..cc72bc7 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,6 +2,7 @@ FROM debian:stable-slim
 
 # APT-cache for all
 RUN sed -i 's@deb.debian.org@apt-cache.lan/deb.debian.org@g' /etc/apt/sources.list
+RUN sed -i 's@security.debian.org@apt-cache.lan/security.debian.org@g' /etc/apt/sources.list