diff --git a/rebar.config b/rebar.config
index f325866..764bbfe 100644
--- a/rebar.config
+++ b/rebar.config
@@ -27,7 +27,7 @@
  [{rebar3_hank, "~> 1.4.0"},
   {rebar3_hex, "~> 7.0.7"},
   {rebar3_format, "~> 1.3.0"},
-  {rebar3_ex_doc, "0.2.18"}]}.
+  {rebar3_ex_doc, "~> 0.2.20"}]}.
 
 %% == Documentation ==
 
diff --git a/rebar.lock b/rebar.lock
index 0333726..91c899e 100644
--- a/rebar.lock
+++ b/rebar.lock
@@ -1,11 +1,11 @@
 {"1.2.0",
-[{<<"katana_code">>,{pkg,<<"katana_code">>,<<"2.0.2">>},0},
+[{<<"katana_code">>,{pkg,<<"katana_code">>,<<"2.1.0">>},0},
  {<<"zipper">>,{pkg,<<"zipper">>,<<"1.0.1">>},0}]}.
 [
 {pkg_hash,[
- {<<"katana_code">>, <<"FAC8F2ABFB2ED54304EE44EEEEC30275BD026550533D094265A51927D7D9470D">>},
+ {<<"katana_code">>, <<"0C42BDCD7E59995876AED9F678CF62E3D12EF42E0FBB2190556E64BFEBDD15C6">>},
  {<<"zipper">>, <<"3CCB4F14B97C06B2749B93D8B6C204A1ECB6FAFC6050CACC3B93B9870C05952A">>}]},
 {pkg_hash_ext,[
- {<<"katana_code">>, <<"3E57FED635E0B16A5FBDACCDC872EC53DEB21ED9FC6E7EB9B6415FF199B7B138">>},
+ {<<"katana_code">>, <<"AE3BBACA187511588F69695A9FF22251CB2CC672FDCCC180289779BDD25175EF">>},
  {<<"zipper">>, <<"6A1FD3E1F0CC1D1DF5642C9A0CE2178036411B0A5C9642851D1DA276BD737C2D">>}]}
 ].