diff --git a/build/docker/ubuntu/Dockerfile b/build/docker/ubuntu/Dockerfile
index 4ad94e1..0b02a70 100644
--- a/build/docker/ubuntu/Dockerfile
+++ b/build/docker/ubuntu/Dockerfile
@@ -37,7 +37,7 @@
 
 # Python dependencies
 RUN apt-get install -y python-all python-all-dev python-all-dbg python-setuptools python-support \
-    python-twisted python-zope.interface
+    python-twisted python-zope.interface python-six
 
 # Ruby dependencies
 RUN apt-get install -y ruby ruby-dev && \
diff --git a/build/travis/installDependencies.sh b/build/travis/installDependencies.sh
index 453494c..df12640 100755
--- a/build/travis/installDependencies.sh
+++ b/build/travis/installDependencies.sh
@@ -27,7 +27,7 @@
 sudo update-java-alternatives -s java-1.7.0-openjdk-amd64
 
 # Python dependencies
-sudo apt-get install -qq python-all python-all-dev python-all-dbg python-setuptools python-support python-twisted
+sudo apt-get install -qq python-all python-all-dev python-all-dbg python-setuptools python-support python-twisted python-six
 
 # Ruby dependencies
 sudo apt-get install -qq ruby ruby-dev