diff --git a/mix.exs b/mix.exs
index 75c8924..597cc66 100644
--- a/mix.exs
+++ b/mix.exs
@@ -22,7 +22,7 @@ defmodule MaruEntity.Mixfile do
 
   def application do
     [
-      extra_applications: [:logger]
+      extra_applications: [:logger, :public_key]
     ]
   end