diff --git a/actix-cors/src/builder.rs b/actix-cors/src/builder.rs
index 1852a54ad..052d490d1 100644
--- a/actix-cors/src/builder.rs
+++ b/actix-cors/src/builder.rs
@@ -58,7 +58,7 @@ static ALL_METHODS_SET: Lazy<HashSet<Method>> = Lazy::new(|| {
 /// server will fail to start up or serve requests.
 ///
 /// # Example
-/// ```rust
+/// ```
 /// use actix_cors::Cors;
 /// use actix_web::http::header;
 ///
diff --git a/actix-cors/src/lib.rs b/actix-cors/src/lib.rs
index 56c7f23fd..9e881ceaa 100644
--- a/actix-cors/src/lib.rs
+++ b/actix-cors/src/lib.rs
@@ -7,7 +7,7 @@
 //! This CORS middleware automatically handles `OPTIONS` preflight requests.
 //!
 //! # Example
-//! ```rust,no_run
+//! ```no_run
 //! use actix_cors::Cors;
 //! use actix_web::{get, http, web, App, HttpRequest, HttpResponse, HttpServer};
 //!
@@ -43,7 +43,7 @@
 
 #![forbid(unsafe_code)]
 #![deny(rust_2018_idioms, nonstandard_style)]
-#![warn(missing_docs, missing_debug_implementations)]
+#![warn(future_incompatible, missing_docs, missing_debug_implementations)]
 #![doc(html_logo_url = "https://actix.rs/img/logo.png")]
 #![doc(html_favicon_url = "https://actix.rs/favicon.ico")]
 
diff --git a/actix-identity/src/lib.rs b/actix-identity/src/lib.rs
index 98466cae6..24391358a 100644
--- a/actix-identity/src/lib.rs
+++ b/actix-identity/src/lib.rs
@@ -45,6 +45,7 @@
 //! ```
 
 #![deny(rust_2018_idioms, nonstandard_style)]
+#![warn(future_incompatible)]
 
 use std::future::Future;
 
diff --git a/actix-protobuf/src/lib.rs b/actix-protobuf/src/lib.rs
index a03a9fdc2..387abe926 100644
--- a/actix-protobuf/src/lib.rs
+++ b/actix-protobuf/src/lib.rs
@@ -1,5 +1,6 @@
 #![forbid(unsafe_code)]
 #![deny(rust_2018_idioms, nonstandard_style)]
+#![warn(future_incompatible)]
 
 use std::{
     fmt,
diff --git a/actix-redis/src/lib.rs b/actix-redis/src/lib.rs
index a582583f5..c2e7187f6 100644
--- a/actix-redis/src/lib.rs
+++ b/actix-redis/src/lib.rs
@@ -1,6 +1,7 @@
 //! Redis integration for Actix and session store for Actix Web.
 
-#![deny(rust_2018_idioms)]
+#![deny(rust_2018_idioms, nonstandard_style)]
+#![warn(future_incompatible)]
 
 mod redis;
 pub use redis::{Command, RedisActor};
diff --git a/actix-session/src/lib.rs b/actix-session/src/lib.rs
index 108193868..ee375b56d 100644
--- a/actix-session/src/lib.rs
+++ b/actix-session/src/lib.rs
@@ -40,7 +40,7 @@
 //! ```
 
 #![deny(rust_2018_idioms, nonstandard_style)]
-#![warn(missing_docs)]
+#![warn(future_incompatible, missing_docs)]
 
 use std::{
     cell::{Ref, RefCell},
diff --git a/actix-web-httpauth/src/lib.rs b/actix-web-httpauth/src/lib.rs
index f61ac50cd..929bc95d7 100644
--- a/actix-web-httpauth/src/lib.rs
+++ b/actix-web-httpauth/src/lib.rs
@@ -16,7 +16,8 @@
 //! [Middleware]: ./middleware
 
 #![forbid(unsafe_code)]
-#![deny(missing_docs, nonstandard_style, rust_2018_idioms)]
+#![deny(rust_2018_idioms, nonstandard_style)]
+#![warn(future_incompatible, missing_docs)]
 
 pub mod extractors;
 pub mod headers;