diff --git a/index.d.cts b/index.d.cts
index c386ae82..8f086191 100644
--- a/index.d.cts
+++ b/index.d.cts
@@ -345,55 +345,15 @@ declare namespace axios {
     protocol?: string;
   }
 
-  type Method =
-    | 'get'
-    | 'GET'
-    | 'delete'
-    | 'DELETE'
-    | 'head'
-    | 'HEAD'
-    | 'options'
-    | 'OPTIONS'
-    | 'post'
-    | 'POST'
-    | 'put'
-    | 'PUT'
-    | 'patch'
-    | 'PATCH'
-    | 'purge'
-    | 'PURGE'
-    | 'link'
-    | 'LINK'
-    | 'unlink'
-    | 'UNLINK';
+  type UppercaseMethod = "GET" | "DELETE" | "HEAD" | "OPTIONS" | "POST" | "PUT" | "PATCH" | "PURGE" | "LINK" | "UNLINK";
+
+  type Method = (UppercaseMethod | Lowercase<UppercaseMethod>) & {};
 
   type ResponseType = 'arraybuffer' | 'blob' | 'document' | 'json' | 'text' | 'stream' | 'formdata';
 
-  type responseEncoding =
-    | 'ascii'
-    | 'ASCII'
-    | 'ansi'
-    | 'ANSI'
-    | 'binary'
-    | 'BINARY'
-    | 'base64'
-    | 'BASE64'
-    | 'base64url'
-    | 'BASE64URL'
-    | 'hex'
-    | 'HEX'
-    | 'latin1'
-    | 'LATIN1'
-    | 'ucs-2'
-    | 'UCS-2'
-    | 'ucs2'
-    | 'UCS2'
-    | 'utf-8'
-    | 'UTF-8'
-    | 'utf8'
-    | 'UTF8'
-    | 'utf16le'
-    | 'UTF16LE';
+  type UppercaseResponseEncoding = "ASCII" | "ANSI" | "BINARY" | "BASE64" | "BASE64URL" | "HEX" | "LATIN1" | "UCS-2" | "UCS2" | "UTF-8" | "UTF8" | "UTF16LE";
+
+  type responseEncoding = (UppercaseResponseEncoding | Lowercase<UppercaseResponseEncoding>) & {};
 
   interface TransitionalOptions {
     silentJSONParsing?: boolean;
diff --git a/index.d.ts b/index.d.ts
index af25bd44..935356cd 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -272,27 +272,9 @@ export enum HttpStatusCode {
   NetworkAuthenticationRequired = 511,
 }
 
-export type Method =
-  | "get"
-  | "GET"
-  | "delete"
-  | "DELETE"
-  | "head"
-  | "HEAD"
-  | "options"
-  | "OPTIONS"
-  | "post"
-  | "POST"
-  | "put"
-  | "PUT"
-  | "patch"
-  | "PATCH"
-  | "purge"
-  | "PURGE"
-  | "link"
-  | "LINK"
-  | "unlink"
-  | "UNLINK";
+type UppercaseMethod = "GET" | "DELETE" | "HEAD" | "OPTIONS" | "POST" | "PUT" | "PATCH" | "PURGE" | "LINK" | "UNLINK";
+
+export type Method = (UppercaseMethod | Lowercase<UppercaseMethod>) & {};
 
 export type ResponseType =
   | "arraybuffer"
@@ -303,31 +285,9 @@ export type ResponseType =
   | "stream"
   | "formdata";
 
-export type responseEncoding =
-  | "ascii"
-  | "ASCII"
-  | "ansi"
-  | "ANSI"
-  | "binary"
-  | "BINARY"
-  | "base64"
-  | "BASE64"
-  | "base64url"
-  | "BASE64URL"
-  | "hex"
-  | "HEX"
-  | "latin1"
-  | "LATIN1"
-  | "ucs-2"
-  | "UCS-2"
-  | "ucs2"
-  | "UCS2"
-  | "utf-8"
-  | "UTF-8"
-  | "utf8"
-  | "UTF8"
-  | "utf16le"
-  | "UTF16LE";
+type UppercaseResponseEncoding = "ASCII" | "ANSI" | "BINARY" | "BASE64" | "BASE64URL" | "HEX" | "LATIN1" | "UCS-2" | "UCS2" | "UTF-8" | "UTF8" | "UTF16LE";
+
+export type responseEncoding = (UppercaseResponseEncoding | Lowercase<UppercaseResponseEncoding>) & {};
 
 export interface TransitionalOptions {
   silentJSONParsing?: boolean;