diff --git a/Cask b/Cask
index 0dfb90c..b3417b9 100644
--- a/Cask
+++ b/Cask
@@ -1,4 +1,7 @@
 (package-file "ansible-doc.el")
 
+(source gnu)
+(source melpa)
+
 (development
  (depends-on "yaml-mode"))