diff --git a/actix-cors/CHANGES.md b/actix-cors/CHANGES.md
index 8030f2169..f54b0b5df 100644
--- a/actix-cors/CHANGES.md
+++ b/actix-cors/CHANGES.md
@@ -1,7 +1,8 @@
 # Changes
 
 ## Unreleased - 2021-xx-xx
-- Ensure that preflight responses contain a Vary header. [#224]
+- Update `actix-web` dependency to 4.0.
+- Ensure that preflight responses contain a `Vary` header. [#224]
 
 [#224]: https://github.com/actix/actix-extras/pull/224
 
diff --git a/actix-cors/Cargo.toml b/actix-cors/Cargo.toml
index d73b88950..88cc377a8 100644
--- a/actix-cors/Cargo.toml
+++ b/actix-cors/Cargo.toml
@@ -19,7 +19,7 @@ path = "src/lib.rs"
 [dependencies]
 actix-service = "2"
 actix-utils = "3"
-actix-web = { version = "4.0.0-rc.1", default-features = false }
+actix-web = { version = "4", default-features = false }
 
 derive_more = "0.99.5"
 futures-util = { version = "0.3.7", default-features = false }
@@ -28,6 +28,6 @@ once_cell = "1"
 smallvec = "1.6.1"
 
 [dev-dependencies]
-actix-web = { version = "4.0.0-rc.2", default_features = false, features = ["macros"] }
+actix-web = { version = "4", default_features = false, features = ["macros"] }
 env_logger = "0.9"
 regex = "1.4"
diff --git a/actix-cors/src/builder.rs b/actix-cors/src/builder.rs
index 6d55671c9..e1dec6960 100644
--- a/actix-cors/src/builder.rs
+++ b/actix-cors/src/builder.rs
@@ -578,7 +578,7 @@ mod test {
         dev::{fn_service, Transform},
         http::{header::HeaderName, StatusCode},
         test::{self, TestRequest},
-        web::HttpResponse,
+        HttpResponse,
     };
 
     use super::*;
diff --git a/actix-cors/src/inner.rs b/actix-cors/src/inner.rs
index fb5756750..92fca0e80 100644
--- a/actix-cors/src/inner.rs
+++ b/actix-cors/src/inner.rs
@@ -360,7 +360,7 @@ mod test {
             })
             .allow_any_method()
             .allow_any_header()
-            .new_transform(test::simple_service(StatusCode::NO_CONTENT))
+            .new_transform(test::status_service(StatusCode::NO_CONTENT))
             .await
             .unwrap();
 
diff --git a/actix-identity/Cargo.toml b/actix-identity/Cargo.toml
index 976507354..c37ff9f6c 100644
--- a/actix-identity/Cargo.toml
+++ b/actix-identity/Cargo.toml
@@ -16,7 +16,7 @@ path = "src/lib.rs"
 [dependencies]
 actix-service = "2"
 actix-utils = "3"
-actix-web = { version = "4.0.0-rc.1", default-features = false, features = ["cookies", "secure-cookies"] }
+actix-web = { version = "4", default-features = false, features = ["cookies", "secure-cookies"] }
 
 futures-util = { version = "0.3.7", default-features = false }
 serde = { version = "1", features = ["derive"] }
@@ -25,4 +25,4 @@ time = "0.3"
 
 [dev-dependencies]
 actix-http = "3.0.0-rc.1"
-actix-web = { version = "4.0.0-rc.2", default_features = false, features = ["macros", "cookies", "secure-cookies"] }
+actix-web = { version = "4", default_features = false, features = ["macros", "cookies", "secure-cookies"] }
diff --git a/actix-protobuf/Cargo.toml b/actix-protobuf/Cargo.toml
index b0da04fce..4d3f7e598 100644
--- a/actix-protobuf/Cargo.toml
+++ b/actix-protobuf/Cargo.toml
@@ -18,11 +18,11 @@ name = "actix_protobuf"
 path = "src/lib.rs"
 
 [dependencies]
-actix-web = { version = "4.0.0-rc.1", default_features = false }
+actix-web = { version = "4", default_features = false }
 derive_more = "0.99.5"
 futures-util = { version = "0.3.7", default-features = false }
 prost = { version = "0.9", default_features = false }
 
 [dev-dependencies]
-actix-web = { version = "4.0.0-rc.2", default_features = false, features = ["macros"] }
+actix-web = { version = "4", default_features = false, features = ["macros"] }
 prost = { version = "0.9", default_features = false, features = ["prost-derive"] }
diff --git a/actix-protobuf/examples/prost-example/Cargo.toml b/actix-protobuf/examples/prost-example/Cargo.toml
index cd4676ed2..f5baf4bae 100644
--- a/actix-protobuf/examples/prost-example/Cargo.toml
+++ b/actix-protobuf/examples/prost-example/Cargo.toml
@@ -8,7 +8,7 @@ authors = [
 ]
 
 [dependencies]
-actix-web = "4.0.0-rc.2"
+actix-web = "4"
 actix-protobuf = { path = "../../" }
 
 env_logger = "0.8"
diff --git a/actix-redis/Cargo.toml b/actix-redis/Cargo.toml
index 9e72fa77a..a7aadba8a 100644
--- a/actix-redis/Cargo.toml
+++ b/actix-redis/Cargo.toml
@@ -45,7 +45,7 @@ tokio = { version = "1.13.1", features = ["sync"] }
 tokio-util = "0.6.1"
 
 # actix-session
-actix-web = { version = "4.0.0-rc.1", default_features = false, optional = true }
+actix-web = { version = "4", default_features = false, optional = true }
 actix-session = { version = "0.5.0-beta.8", optional = true }
 rand = { version = "0.8.0", optional = true }
 serde = { version = "1.0.101", optional = true }
@@ -53,7 +53,7 @@ serde_json = { version = "1.0.40", optional = true }
 
 [dev-dependencies]
 actix-test = "0.1.0-beta.12"
-actix-web = { version = "4.0.0-rc.2", default_features = false, features = ["macros"] }
+actix-web = { version = "4", default_features = false, features = ["macros"] }
 env_logger = "0.9"
 serde = { version = "1.0.101", features = ["derive"] }
 
diff --git a/actix-session/Cargo.toml b/actix-session/Cargo.toml
index 98e2ce6c9..180e6929d 100644
--- a/actix-session/Cargo.toml
+++ b/actix-session/Cargo.toml
@@ -20,7 +20,7 @@ cookie-session = ["actix-web/secure-cookies"]
 [dependencies]
 actix-service = "2"
 actix-utils = "3"
-actix-web = { version = "4.0.0-rc.1", default_features = false, features = ["cookies"] }
+actix-web = { version = "4", default_features = false, features = ["cookies"] }
 
 derive_more = "0.99.5"
 futures-util = { version = "0.3.7", default-features = false }
@@ -30,4 +30,4 @@ serde_json = "1.0"
 time = "0.3"
 
 [dev-dependencies]
-actix-web = { version = "4.0.0-rc.2", default_features = false, features = ["macros", "cookies"] }
+actix-web = { version = "4", default_features = false, features = ["macros", "cookies"] }
diff --git a/actix-web-httpauth/Cargo.toml b/actix-web-httpauth/Cargo.toml
index 7e50ccda5..323346c5a 100644
--- a/actix-web-httpauth/Cargo.toml
+++ b/actix-web-httpauth/Cargo.toml
@@ -20,7 +20,7 @@ path = "src/lib.rs"
 [dependencies]
 actix-service = "2"
 actix-utils = "3"
-actix-web = { version = "4.0.0-rc.1", default_features = false }
+actix-web = { version = "4", default_features = false }
 
 base64 = "0.13"
 futures-util = { version = "0.3.7", default-features = false }
@@ -29,4 +29,4 @@ pin-project-lite = "0.2.7"
 
 [dev-dependencies]
 actix-cors = "0.6.0-beta.10"
-actix-web = { version = "4.0.0-rc.2", default_features = false, features = ["macros"] }
+actix-web = { version = "4", default_features = false, features = ["macros"] }