diff --git a/index.d.ts b/index.d.ts
index a3de6f0..c643aa7 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -1,5 +1,15 @@
-// TypeScript Version: 3.0
-export type AxiosRequestHeaders = Record<string, string | string[] | number | boolean>;
+// TypeScript Version: 4.1
+type AxiosHeaders = Record<string, string | string[] | number | boolean>;
+
+type MethodsHeaders = {
+  [Key in Method as Lowercase<Key>]: AxiosHeaders;
+};
+
+interface CommonHeaders  {
+  common: AxiosHeaders;
+}
+
+export type AxiosRequestHeaders = Partial<AxiosHeaders & MethodsHeaders & CommonHeaders>;
 
 export type AxiosResponseHeaders = Record<string, string> & {
   "set-cookie"?: string[]