diff --git a/Dockerfile b/Dockerfile
index a6eda25..16577fe 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,10 @@
-FROM ubuntu:14.04
+FROM ubuntu:14.04.3
+
+RUN apt-get update \
+    && DEBIAN_FRONTEND=noninteractive apt-get -y upgrade \
+    && DEBIAN_FRONTEND=noninteractive apt-get -y install strongswan iptables uuid-runtime \
+    && rm -rf /var/lib/apt/lists/* # cache busted 20151028.1
 
-RUN apt-get update
-RUN apt-get -y install strongswan iptables uuid-runtime
 RUN rm /etc/ipsec.secrets
 
 ADD ./etc/* /etc/