diff --git a/CHANGELOG.md b/CHANGELOG.md
index ee8fa355a..5c4e40016 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog and release notes
 
+## Unreleased
+### Fixes
+- fix missing loosely typed overload signature for `createUnionType` (remove the 10 types limit)
+
 ## v0.13.0
 ### Features
 - make `class-validator` a virtual peer dependency and update it to newest `0.9.1` version
diff --git a/src/decorators/unions.ts b/src/decorators/unions.ts
index b064d1b87..e69c7eef7 100644
--- a/src/decorators/unions.ts
+++ b/src/decorators/unions.ts
@@ -85,13 +85,18 @@ export function createUnionType<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10>(
     ]
   >,
 ): T1 | T2 | T3 | T4 | T5 | T6 | T7 | T8 | T9 | T10;
+export function createUnionType({
+  types,
+  name,
+  description,
+}: UnionTypeConfig<ClassType[]>): ClassType[];
 // #endregion
-export function createUnionType({ types, name, description }: UnionTypeConfig<ClassType[]>) {
-  const unionMetadata = getMetadataStorage().collectUnionMetadata({
+export function createUnionType({ types, name, description }: UnionTypeConfig<ClassType[]>): any {
+  const unionMetadataSymbol = getMetadataStorage().collectUnionMetadata({
     types,
     name,
     description,
   });
 
-  return unionMetadata;
+  return unionMetadataSymbol;
 }