diff --git a/build/docker/debian/Dockerfile b/build/docker/debian/Dockerfile
index 22dd3b5..285c85b 100644
--- a/build/docker/debian/Dockerfile
+++ b/build/docker/debian/Dockerfile
@@ -145,6 +145,10 @@
 # Ruby
 RUN gem install bundler --no-ri --no-rdoc
 
+# Python optional dependencies
+RUN pip2 install -U ipaddress backports.ssl_match_hostname tornado
+RUN pip3 install -U backports.ssl_match_hostname tornado
+
 # Go
 RUN curl -sSL https://storage.googleapis.com/golang/go1.4.3.linux-amd64.tar.gz | tar -C /usr/local/ -xz
 ENV PATH /usr/local/go/bin:$PATH