diff --git a/mix.exs b/mix.exs
index d73489797..003a48e91 100644
--- a/mix.exs
+++ b/mix.exs
@@ -101,6 +101,7 @@ defmodule Ejabberd.MixProject do
     [{:base64url, "~> 1.0"},
      {:cache_tab, "~> 1.0"},
      {:eimp, "~> 1.0"},
+     {:ex_doc, ">= 0.0.0", only: :dev},
      {:fast_tls, "~> 1.1"},
      {:fast_xml, "~> 1.1"},
      {:fast_yaml, "~> 1.0"},