diff --git a/poem-grpc/CHANGELOG.md b/poem-grpc/CHANGELOG.md
index 88ab5917bc..490e3f4792 100644
--- a/poem-grpc/CHANGELOG.md
+++ b/poem-grpc/CHANGELOG.md
@@ -4,6 +4,10 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+# [0.5.1] 2024-09-12
+
+- set the correct `content-type` for `GrpcClient`
+
 # [0.5.0] 2024-09-08
 
 - add support for GRPC compression
diff --git a/poem-grpc/Cargo.toml b/poem-grpc/Cargo.toml
index 01a6aa3a12..6094f48ca3 100644
--- a/poem-grpc/Cargo.toml
+++ b/poem-grpc/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "poem-grpc"
-version = "0.5.0"
+version = "0.5.1"
 authors.workspace = true
 edition.workspace = true
 license.workspace = true
diff --git a/poem-grpc/src/client.rs b/poem-grpc/src/client.rs
index f5ff77c46c..da9861e2a9 100644
--- a/poem-grpc/src/client.rs
+++ b/poem-grpc/src/client.rs
@@ -401,11 +401,15 @@ fn create_http_request<T: Codec>(
         .uri_str(path)
         .method(Method::POST)
         .version(Version::HTTP_2)
-        .content_type(T::CONTENT_TYPES[0])
-        .header(header::TE, "trailers")
         .finish();
-    http_request.headers_mut().extend(metadata.headers);
+    *http_request.headers_mut() = metadata.headers;
     *http_request.extensions_mut() = extensions;
+    http_request
+        .headers_mut()
+        .insert("content-type", T::CONTENT_TYPES[0].parse().unwrap());
+    http_request
+        .headers_mut()
+        .insert(header::TE, "trailers".parse().unwrap());
     if let Some(send_compressd) = send_compressd {
         http_request.headers_mut().insert(
             "grpc-encoding",