diff --git a/Dockerfile b/Dockerfile
index 88eab0bb..4fc77e31 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,10 +2,15 @@
 # |==> phusion/baseimage -- https://github.com/phusion/baseimage-docker
 #      |==> phusion/passenger-docker -- https://github.com/phusion/passenger-docker
 #           |==> HERE
-FROM phusion/passenger-ruby24:1.0.0
+FROM phusion/passenger-ruby24:1.0.5
 
 # Update OS as per https://github.com/phusion/passenger-docker#upgrading-the-operating-system-inside-the-container
-RUN apt-get update && apt-get upgrade -y -o Dpkg::Options::="--force-confold"
+RUN apt-get update & \
+    apt-get upgrade -y -o Dpkg::Options::="--force-confold" & \
+    apt-get -qy autoremove & \
+    apt-get clean & \
+    rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+
 RUN bash -lc 'rvm --default use ruby-2.4.5'
 
 ENV APP_HOME=/home/app/pact_broker/