diff --git a/Dockerfile b/Dockerfile
index d711db5..bfe308a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,11 +5,15 @@ MAINTAINER sparklyballs
 ARG DEBIAN_FRONTEND="noninteractive"
 ENV XDG_CONFIG_HOME="/config/xdg"
 
-# add sonarr repository
+# add sonarr and mono repositories
 RUN \
  apt-key adv --keyserver keyserver.ubuntu.com --recv-keys FDA5DFFC && \
  echo "deb http://apt.sonarr.tv/ master main" > \
 	/etc/apt/sources.list.d/sonarr.list && \
+ apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 \
+	--recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF && \
+ echo "deb http://download.mono-project.com/repo/debian wheezy main" \
+	| tee /etc/apt/sources.list.d/mono-xamarin.list && \
 
 # install packages
  apt-get update && \
diff --git a/README.md b/README.md
index 5946f4e..11f1363 100644
--- a/README.md
+++ b/README.md
@@ -71,6 +71,7 @@ Access the webui at `<your-ip>:8989`, for more information check out [Sonarr](ht
 
 ## Changelog
 
++ **13.04.17:** Switch to official mono repository.
 + **30.09.16:** Fix umask
 + **23.09.16:** Add cd to /opt fixes redirects with althub (issue #25)
 , make XDG config environment variable