diff --git a/Dockerfile b/Dockerfile
index a052f7d..0c06bd6 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
 FROM mono:slim
 
 RUN apt-get update -y && apt-get upgrade -y
-RUN apt-get install -y mono-complete gtk-sharp2 nuget capnproto git
+RUN apt-get install -y mono-complete gtk-sharp2 nuget capnproto git ruby