diff --git a/README.md b/README.md
index e5e362e..bcd29a9 100644
--- a/README.md
+++ b/README.md
@@ -17,7 +17,7 @@ of dependencies in `mix.exs`:
 ```elixir
 def deps do
   [
-    {:holidefs, "~> 0.3"}
+    {:holidefs, "~> 0.4"}
   ]
 end
 ```