diff --git a/.github/workflows/erlang.yml b/.github/workflows/erlang.yml
index 3c7507b..6bcc3dc 100644
--- a/.github/workflows/erlang.yml
+++ b/.github/workflows/erlang.yml
@@ -13,8 +13,8 @@ jobs:
 
     strategy:
       matrix:
-        otp: ['25.2.1']
-        rebar: ['3.20.0']
+        otp: ['25', '26', '27']
+        rebar: ['3.23']
 
     steps:
     - uses: actions/checkout@v2
diff --git a/rebar.config b/rebar.config
index 62a5949..1eabb47 100644
--- a/rebar.config
+++ b/rebar.config
@@ -21,7 +21,12 @@
 
 {dialyzer,
  [{warnings,
-   [no_return, unmatched_returns, error_handling, missing_return, extra_return]}]}.
+   [no_return,
+    unmatched_returns,
+    error_handling,
+    missing_return,
+    extra_return,
+    no_unknown]}]}.
 
 {edoc_opts,
  [{todo, true},
diff --git a/rebar.lock b/rebar.lock
index 31c3009..bb34dbd 100644
--- a/rebar.lock
+++ b/rebar.lock
@@ -1,8 +1,8 @@
 {"1.2.0",
-[{<<"katana_code">>,{pkg,<<"katana_code">>,<<"2.1.0">>},0}]}.
+[{<<"katana_code">>,{pkg,<<"katana_code">>,<<"2.1.1">>},0}]}.
 [
 {pkg_hash,[
- {<<"katana_code">>, <<"0C42BDCD7E59995876AED9F678CF62E3D12EF42E0FBB2190556E64BFEBDD15C6">>}]},
+ {<<"katana_code">>, <<"9AC515E6B5AE4903CD7B6C9161ABFBA49B610B6F3E19E8F0542802A4316C2405">>}]},
 {pkg_hash_ext,[
- {<<"katana_code">>, <<"AE3BBACA187511588F69695A9FF22251CB2CC672FDCCC180289779BDD25175EF">>}]}
+ {<<"katana_code">>, <<"0680F33525B9A882E6F4D3022518B15C46F648BD7B0DBE86900980FE1C291404">>}]}
 ].