diff --git a/src/hex_api_release.erl b/src/hex_api_release.erl
index d60b24f..763a085 100644
--- a/src/hex_api_release.erl
+++ b/src/hex_api_release.erl
@@ -143,10 +143,18 @@ delete(Config, Name, Version) when is_map(Config) and is_binary(Name) and is_bin
 %% '''
 %% @end
 -spec retire(hex_core:config(), binary(), binary(), retirement_params()) -> hex_api:response().
-retire(Config, Name, Version, Params) when
+retire(Config, Name, Version, Params0) when
     is_map(Config) and is_binary(Name) and is_binary(Version)
 ->
     Path = hex_api:build_repository_path(Config, ["packages", Name, "releases", Version, "retire"]),
+    Params = maps:fold(
+        fun (K, V, AccIn) ->
+            AccIn#{
+                atom_to_binary(K) => V
+            }
+        end,
+        #{},
+        Params0),
     hex_api:post(Config, Path, Params).
 
 %% @doc