diff --git a/.github/workflows/linux.yml b/.github/workflows/linux.yml
index f94d5f81..ae804cc5 100644
--- a/.github/workflows/linux.yml
+++ b/.github/workflows/linux.yml
@@ -8,7 +8,7 @@ jobs:
       fail-fast: false
       matrix:
         version:
-          - 1.39.0 # MSRV
+          - 1.40.0 # MSRV
           - stable
           - nightly
 
diff --git a/CHANGES.md b/CHANGES.md
index 97b7ca63..09b8f6a6 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -5,6 +5,7 @@
 ### Changed
 
 * Resources and Scopes can now access non-overridden data types set on App (or containing scopes) when setting their own data. [#1486]
+* Bump minimum supported Rust version to 1.40
 
 ## [3.0.0-alpha.2] - 2020-05-08
 
diff --git a/README.md b/README.md
index 5dc8d376..97e3ceea 100644
--- a/README.md
+++ b/README.md
@@ -9,7 +9,7 @@
 [![Join the chat at https://gitter.im/actix/actix](https://badges.gitter.im/actix/actix.svg)](https://gitter.im/actix/actix?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 [![Documentation](https://docs.rs/actix-web/badge.svg)](https://docs.rs/actix-web)
 [![Download](https://img.shields.io/crates/d/actix-web.svg)](https://crates.io/crates/actix-web)
-[![Version](https://img.shields.io/badge/rustc-1.39+-lightgray.svg)](https://blog.rust-lang.org/2019/11/07/Rust-1.39.0.html)
+[![Version](https://img.shields.io/badge/rustc-1.40+-lightgray.svg)](https://blog.rust-lang.org/2019/12/19/Rust-1.40.0.html)
 ![License](https://img.shields.io/crates/l/actix-web.svg)
 
   </p>
@@ -38,6 +38,7 @@ Actix web is a simple, pragmatic and extremely fast web framework for Rust.
 * Middlewares ([Logger, Session, CORS, etc](https://actix.rs/docs/middleware/))
 * Includes an asynchronous [HTTP client](https://actix.rs/actix-web/actix_web/client/index.html)
 * Supports [Actix actor framework](https://github.com/actix/actix)
+* Supports Rust 1.40+
 
 ## Docs
 
diff --git a/actix-files/CHANGES.md b/actix-files/CHANGES.md
index c4918b56..7901a392 100644
--- a/actix-files/CHANGES.md
+++ b/actix-files/CHANGES.md
@@ -1,5 +1,9 @@
 # Changes
 
+## [Unreleased] - 2020-xx-xx
+
+* Bump minimum supported Rust version to 1.40
+
 ## [0.2.1] - 2019-12-22
 
 * Use the same format for file URLs regardless of platforms
diff --git a/actix-files/README.md b/actix-files/README.md
index 9585e67a..5a5a6208 100644
--- a/actix-files/README.md
+++ b/actix-files/README.md
@@ -6,4 +6,4 @@
 * [API Documentation](https://docs.rs/actix-files/)
 * [Chat on gitter](https://gitter.im/actix/actix)
 * Cargo package: [actix-files](https://crates.io/crates/actix-files)
-* Minimum supported Rust version: 1.33 or later
+* Minimum supported Rust version: 1.40 or later
diff --git a/actix-framed/README.md b/actix-framed/README.md
index 1714b364..3a5ea059 100644
--- a/actix-framed/README.md
+++ b/actix-framed/README.md
@@ -5,4 +5,4 @@
 * [API Documentation](https://docs.rs/actix-framed/)
 * [Chat on gitter](https://gitter.im/actix/actix)
 * Cargo package: [actix-framed](https://crates.io/crates/actix-framed)
-* Minimum supported Rust version: 1.33 or later
+* Minimum supported Rust version: 1.40 or later
diff --git a/actix-framed/changes.md b/actix-framed/changes.md
index 41c7aed0..1c5d31fa 100644
--- a/actix-framed/changes.md
+++ b/actix-framed/changes.md
@@ -1,5 +1,9 @@
 # Changes
 
+## [Unreleased] - 2020-xx-xx
+
+* Bump minimum supported Rust version to 1.40
+
 ## [0.3.0] - 2019-12-25
 
 * Migrate to actix-http 1.0
diff --git a/actix-http/CHANGES.md b/actix-http/CHANGES.md
index 56cd9e58..e96b0451 100644
--- a/actix-http/CHANGES.md
+++ b/actix-http/CHANGES.md
@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+### Changed
+
+* Bump minimum supported Rust version to 1.40
+
 ### Fixed
 
 * Support parsing of `SameSite=None` [#1503]
diff --git a/actix-http/README.md b/actix-http/README.md
index 9acad3e6..d4c96f2a 100644
--- a/actix-http/README.md
+++ b/actix-http/README.md
@@ -8,7 +8,7 @@ Actix http
 * [API Documentation](https://docs.rs/actix-http/)
 * [Chat on gitter](https://gitter.im/actix/actix)
 * Cargo package: [actix-http](https://crates.io/crates/actix-http)
-* Minimum supported Rust version: 1.31 or later
+* Minimum supported Rust version: 1.40 or later
 
 ## Example
 
diff --git a/actix-multipart/CHANGES.md b/actix-multipart/CHANGES.md
index ed5c8ad3..e7bea62c 100644
--- a/actix-multipart/CHANGES.md
+++ b/actix-multipart/CHANGES.md
@@ -1,5 +1,9 @@
 # Changes
 
+## [Unreleased] - 2020-xx-xx
+
+* Bump minimum supported Rust version to 1.40
+
 ## [0.2.1] - 2020-01-xx
 
 * Remove the unused `time` dependency
diff --git a/actix-multipart/README.md b/actix-multipart/README.md
index a453f489..edb2e002 100644
--- a/actix-multipart/README.md
+++ b/actix-multipart/README.md
@@ -5,4 +5,4 @@
 * [API Documentation](https://docs.rs/actix-multipart/)
 * [Chat on gitter](https://gitter.im/actix/actix)
 * Cargo package: [actix-multipart](https://crates.io/crates/actix-multipart)
-* Minimum supported Rust version: 1.39 or later
+* Minimum supported Rust version: 1.40 or later
diff --git a/actix-web-actors/CHANGES.md b/actix-web-actors/CHANGES.md
index 68947569..8fd48f77 100644
--- a/actix-web-actors/CHANGES.md
+++ b/actix-web-actors/CHANGES.md
@@ -1,6 +1,10 @@
 # Changes
 
-# [3.0.0-alpha.1] - 2020-05-08
+## [Unreleased] - 2020-xx-xx
+
+* Bump minimum supported Rust version to 1.40
+
+## [3.0.0-alpha.1] - 2020-05-08
 
 * Update the actix-web dependency to 3.0.0-alpha.1
 * Update the actix dependency to 0.10.0-alpha.2
diff --git a/actix-web-actors/README.md b/actix-web-actors/README.md
index 6ff7ac67..fb8c3a62 100644
--- a/actix-web-actors/README.md
+++ b/actix-web-actors/README.md
@@ -5,4 +5,4 @@ Actix actors support for actix web framework [![Build Status](https://travis-ci.
 * [API Documentation](https://docs.rs/actix-web-actors/)
 * [Chat on gitter](https://gitter.im/actix/actix)
 * Cargo package: [actix-web-actors](https://crates.io/crates/actix-web-actors)
-* Minimum supported Rust version: 1.33 or later
+* Minimum supported Rust version: 1.40 or later
diff --git a/actix-web-codegen/CHANGES.md b/actix-web-codegen/CHANGES.md
index 941cd36d..da2faee3 100644
--- a/actix-web-codegen/CHANGES.md
+++ b/actix-web-codegen/CHANGES.md
@@ -1,5 +1,9 @@
 # Changes
 
+## [Unreleased] - 2020-xx-xx
+
+* Bump minimum supported Rust version to 1.40
+
 ## [0.2.1] - 2020-02-25
 
 * Add `#[allow(missing_docs)]` attribute to generated structs [#1368]
diff --git a/actix-web-codegen/README.md b/actix-web-codegen/README.md
index c44a5fc7..c482a6b3 100644
--- a/actix-web-codegen/README.md
+++ b/actix-web-codegen/README.md
@@ -1 +1,8 @@
 # Macros for actix-web framework [![Build Status](https://travis-ci.org/actix/actix-web.svg?branch=master)](https://travis-ci.org/actix/actix-web) [![codecov](https://codecov.io/gh/actix/actix-web/branch/master/graph/badge.svg)](https://codecov.io/gh/actix/actix-web) [![crates.io](https://meritbadge.herokuapp.com/actix-web-codegen)](https://crates.io/crates/actix-web-codegen) [![Join the chat at https://gitter.im/actix/actix](https://badges.gitter.im/actix/actix.svg)](https://gitter.im/actix/actix?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+
+## Documentation & Resources
+
+* [API Documentation](https://docs.rs/actix-web-codegen/)
+* [Chat on gitter](https://gitter.im/actix/actix)
+* Cargo package: [actix-web-codegen](https://crates.io/crates/actix-web-codegen)
+* Minimum supported Rust version: 1.40 or later
diff --git a/awc/CHANGES.md b/awc/CHANGES.md
index d127700a..67bbc38c 100644
--- a/awc/CHANGES.md
+++ b/awc/CHANGES.md
@@ -5,6 +5,7 @@
 ### Changed
 
 * Implement `std::error::Error` for our custom errors [#1422]
+* Bump minimum supported Rust version to 1.40
 
 [#1422]: https://github.com/actix/actix-web/pull/1422
 
diff --git a/awc/README.md b/awc/README.md
index 3b0034d7..2b6309c1 100644
--- a/awc/README.md
+++ b/awc/README.md
@@ -8,7 +8,7 @@ An HTTP Client
 * [API Documentation](https://docs.rs/awc/)
 * [Chat on gitter](https://gitter.im/actix/actix)
 * Cargo package: [awc](https://crates.io/crates/awc)
-* Minimum supported Rust version: 1.33 or later
+* Minimum supported Rust version: 1.40 or later
 
 ## Example
 
diff --git a/src/lib.rs b/src/lib.rs
index d7cb4507..cff4acf2 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -72,7 +72,7 @@
 //! * SSL support with OpenSSL or `native-tls`
 //! * Middlewares (`Logger`, `Session`, `CORS`, `DefaultHeaders`)
 //! * Supports [Actix actor framework](https://github.com/actix/actix)
-//! * Supported Rust version: 1.39 or later
+//! * Supported Rust version: 1.40 or later
 //!
 //! ## Package feature
 //!
diff --git a/test-server/CHANGES.md b/test-server/CHANGES.md
index 35552030..6a92d581 100644
--- a/test-server/CHANGES.md
+++ b/test-server/CHANGES.md
@@ -5,6 +5,7 @@
 * Update the `time` dependency to 0.2.7
 * Update `actix-connect` dependency to 2.0.0-alpha.2
 * Make `test_server` `async` fn.
+* Bump minimum supported Rust version to 1.40
 
 ## [1.0.0] - 2019-12-13
 
diff --git a/test-server/README.md b/test-server/README.md
index e4065012..db0791db 100644
--- a/test-server/README.md
+++ b/test-server/README.md
@@ -6,4 +6,4 @@
 * [API Documentation](https://docs.rs/actix-http-test/)
 * [Chat on gitter](https://gitter.im/actix/actix)
 * Cargo package: [actix-http-test](https://crates.io/crates/actix-http-test)
-* Minimum supported Rust version: 1.33 or later
+* Minimum supported Rust version: 1.40 or later