diff --git a/Cargo.toml b/Cargo.toml
index a3865fc04..b4cc48dae 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -16,7 +16,7 @@ keywords = ["http", "actix-web", "tracing", "logging"]
 categories = ["asynchronous", "web-programming"]
 
 [dependencies]
-actix-web = "4.0.0-beta.1"
+actix-web = "4.0.0-beta.3"
 tracing = "0.1.19"
 tracing-futures = "0.2.4"
 futures = "0.3.5"
diff --git a/src/lib.rs b/src/lib.rs
index b39d1a7e7..c7c460049 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -167,11 +167,11 @@ where
     type Error = Error;
     type Future = Pin<Box<dyn Future<Output = Result<Self::Response, Self::Error>>>>;
 
-    fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
+    fn poll_ready(&self, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
         self.service.poll_ready(cx)
     }
 
-    fn call(&mut self, req: ServiceRequest) -> Self::Future {
+    fn call(&self, req: ServiceRequest) -> Self::Future {
         let user_agent = req
             .headers()
             .get("User-Agent")