diff --git a/.changeset/chatty-plants-dance.md b/.changeset/chatty-plants-dance.md
new file mode 100644
index 00000000..8c56fff8
--- /dev/null
+++ b/.changeset/chatty-plants-dance.md
@@ -0,0 +1,5 @@
+---
+'@hono/trpc-server': patch
+---
+
+use `c.body` to create response to avoid header loss
diff --git a/packages/trpc-server/package.json b/packages/trpc-server/package.json
index d2f3fbd7..d5c1373d 100644
--- a/packages/trpc-server/package.json
+++ b/packages/trpc-server/package.json
@@ -28,11 +28,11 @@
   "homepage": "https://honojs.dev",
   "peerDependencies": {
     "@trpc/server": "^10.10.0",
-    "hono": ">=3.*"
+    "hono": ">=4.*"
   },
   "devDependencies": {
     "@trpc/server": "^10.10.0",
-    "hono": "^3.11.7",
+    "hono": "^4.3.6",
     "jest": "^29.7.0",
     "rimraf": "^5.0.5",
     "zod": "^3.20.2"
diff --git a/packages/trpc-server/src/index.ts b/packages/trpc-server/src/index.ts
index f964d8be..5b8fd34d 100644
--- a/packages/trpc-server/src/index.ts
+++ b/packages/trpc-server/src/index.ts
@@ -32,7 +32,7 @@ export const trpcServer = ({
       }),
       endpoint,
       req: c.req.raw,
-    })
+    }).then((res) => c.body(res.body, res))
     return res
   }
 }
diff --git a/yarn.lock b/yarn.lock
index 66097e87..6abe9c0d 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2094,13 +2094,13 @@ __metadata:
   resolution: "@hono/trpc-server@workspace:packages/trpc-server"
   dependencies:
     "@trpc/server": "npm:^10.10.0"
-    hono: "npm:^3.11.7"
+    hono: "npm:^4.3.6"
     jest: "npm:^29.7.0"
     rimraf: "npm:^5.0.5"
     zod: "npm:^3.20.2"
   peerDependencies:
     "@trpc/server": ^10.10.0
-    hono: ">=3.*"
+    hono: ">=4.*"
   languageName: unknown
   linkType: soft