diff --git a/rebar.config b/rebar.config
index c4d0c77..bc07f12 100644
--- a/rebar.config
+++ b/rebar.config
@@ -50,4 +50,4 @@
   {rebar3_lint, "~> 3.1.0"},
   {rebar3_hank, "~> 1.4.0"},
   {rebar3_sheldon, "~> 0.4.3"},
-  {rebar3_ex_doc, "~> 0.2.20"}]}.
+  {rebar3_ex_doc, "~> 0.2.21"}]}.