diff --git a/docker/Dockerfile b/docker/Dockerfile
index c16a9fd..804659a 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -1,20 +1,16 @@
 FROM ubuntu:16.04
 MAINTAINER koalaman <koalaman@gmail.com>
 
-RUN apt-get update -qy
-
-RUN apt-get -qy install git cabal-install
-
-RUN cd $HOME && git clone https://github.com/koalaman/shellcheck.git
-RUN cd $HOME/shellcheck && cabal update
-RUN cd $HOME/shellcheck && cabal install
-
-
-# Clean apt cache
-RUN apt-get clean && \
+RUN apt-get update -y && \
+    apt-get -y --no-install-recommends install git cabal-install && \
+    apt-get clean && \
     apt-get autoremove && \
-    rm -rf /var/lib/apt/lists/* \
-    rm -rf /var/cache/*.tar.gz \
-    rm -rf /var/cache/*/*.tar.gz
+    rm -rf /var/lib/apt/lists/*
+
+RUN git config --global http.sslVerify false
+WORKDIR /root
+RUN git clone https://github.com/koalaman/shellcheck.git
+WORKDIR /root/shellcheck
+RUN cabal update && cabal install
 
 ENTRYPOINT ["/root/.cabal/bin/shellcheck"]