diff --git a/Dockerfile b/Dockerfile
index 06c2418..de75835 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,4 +2,4 @@ FROM thomasweise/docker-texlive-full
 MAINTAINER Marcel Schneider <marcel@webschneider.org>
 RUN apt-get update
 RUN apt-get install -y apt-utils
-RUN apt-get install -y python-pygments
+RUN apt-get install -y python-pygments && parallel