diff --git a/packer/provision/basebuild.sh b/packer/provision/basebuild.sh
index 23fb474..e212118 100644
--- a/packer/provision/basebuild.sh
+++ b/packer/provision/basebuild.sh
@@ -154,7 +154,7 @@
 
     # install ruby gems
     gem install \
-        mdl
+        mdl -v 0.5.0
         # end of gem install list
 
     # install npm modules