diff --git a/Dockerfile b/Dockerfile
index 78718c68d6a8c25f0281ea85bf198fed0561a1f9..bdf5708b489dbd94cd3841cc823d53b7df59feb5 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,8 @@
 FROM debian:jessie
 ENV DEBIAN_FRONTEND noninteractive
 RUN apt-get update && \
-    apt-get install -y unbound unbound-host dnsutils dma bsd-mailx
+    apt-get install -y unbound unbound-host dnsutils dma bsd-mailx && \
+    rm -rf /tmp/* /var/tmp/* /var/lib/apt/lists/* /var/cache/apt/archives/*
 COPY entrypoint.sh /entrypoint.sh
 ENTRYPOINT ["/entrypoint.sh"]
 CMD ["/bin/bash", "--login"]