diff --git a/.changeset/support-v4.md b/.changeset/support-v4.md
new file mode 100644
index 00000000..c92e5c1a
--- /dev/null
+++ b/.changeset/support-v4.md
@@ -0,0 +1,5 @@
+---
+'@hono/firebase-auth': patch
+---
+
+- supported v4 to get header values
\ No newline at end of file
diff --git a/packages/firebase-auth/jest.config.js b/packages/firebase-auth/jest.config.js
deleted file mode 100644
index f697d831..00000000
--- a/packages/firebase-auth/jest.config.js
+++ /dev/null
@@ -1 +0,0 @@
-module.exports = require('../../jest.config.js')
diff --git a/packages/firebase-auth/src/index.ts b/packages/firebase-auth/src/index.ts
index 99520930..2698a65b 100644
--- a/packages/firebase-auth/src/index.ts
+++ b/packages/firebase-auth/src/index.ts
@@ -43,7 +43,7 @@ export const verifyFirebaseAuth = (userConfig: VerifyFirebaseAuthConfig): Middle
   }
 
   return async (c, next) => {
-    const authorization = c.req.headers.get(config.AuthorizationHeaderKey)
+    const authorization = c.req.raw.headers.get(config.AuthorizationHeaderKey)
     if (authorization === null) {
       const res = new Response('Bad Request', {
         status: 400,