diff --git a/index.d.ts b/index.d.ts
index 9a151e2..3f0ac51 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -9,7 +9,7 @@
 //   Marvin Hagemeister <https://github.com/marvinhagemeister>
 
 export type Value = string | number | boolean | undefined | null;
-export type Mapping = { [key: string]: Value };
+export type Mapping = { [key: string]: any };
 export type Argument = Value | Mapping | Argument[];
 
 export default function classNames(...args: Argument[]): string;