diff --git a/CHANGELOG.md b/CHANGELOG.md
index 829dee98..e39b4d0e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,11 @@ 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).
 
+# [4.0.0] 2022-4-19
+
+- Add `#[non_exhaustive]` attribute to Request/Response types.
+- Introduce ability to pre-parse Request's query. [#891](https://github.com/async-graphql/async-graphql/pull/891)
+
 # [3.0.38] 2022-4-8
 
 - Update Axum integration to Axum 0.5.1 [#883](https://github.com/async-graphql/async-graphql/pull/883)
diff --git a/src/request.rs b/src/request.rs
index 7e24d82f..d615e5ac 100644
--- a/src/request.rs
+++ b/src/request.rs
@@ -12,6 +12,7 @@ use crate::{Data, ParseRequestError, ServerError, UploadValue, Value, Variables}
 ///
 /// This can be deserialized from a structure of the query string, the operation name and the
 /// variables. The names are all in `camelCase` (e.g. `operationName`).
+#[non_exhaustive]
 #[derive(Serialize, Deserialize)]
 #[serde(rename_all = "camelCase")]
 pub struct Request {
diff --git a/src/response.rs b/src/response.rs
index 08781a8a..e8bcd134 100644
--- a/src/response.rs
+++ b/src/response.rs
@@ -7,6 +7,7 @@ use serde::{Deserialize, Serialize};
 use crate::{CacheControl, Result, ServerError, Value};
 
 /// Query response
+#[non_exhaustive]
 #[derive(Debug, Default, Serialize, Deserialize, PartialEq)]
 pub struct Response {
     /// Data of query result