diff --git a/CHANGELOG.md b/CHANGELOG.md
index c3b0f2d..4f0a8da 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,8 @@
 
 ## Next (YYYY-MM-DD)
 
+## v4.0.0 (2023-11-05)
+
 - Clarify why and in which situations `AsyncGroupChild::wait` may not behave as expected when cancelled.
 - Add `AsyncGroupChild::start_kill` to align with Tokio's `Child::start_kill`.
 - Change `AsyncGroupChild::kill` to also `wait()` on the child, to align with Tokio's `Child::kill`.
diff --git a/CITATION.cff b/CITATION.cff
index 1329d7e..f048c08 100644
--- a/CITATION.cff
+++ b/CITATION.cff
@@ -2,8 +2,8 @@ cff-version: 1.2.0
 message: If you use this software, please cite it using these metadata.
 title: "Command Group: extension to Command to spawn in a process group"
 
-version: "3.0.0"
-date-released: 2023-10-30
+version: "4.0.0"
+date-released: 2023-11-05
 
 repository-code: https://github.com/watchexec/command-group
 license: Apache-2.0 OR MIT
diff --git a/Cargo.toml b/Cargo.toml
index e63edd3..994743c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "command-group"
-version = "3.0.0"
+version = "4.0.0"
 
 authors = ["Félix Saparelli <felix@passcod.name>"]
 license = "Apache-2.0 OR MIT"
diff --git a/README.md b/README.md
index 1f5544a..55ca80b 100644
--- a/README.md
+++ b/README.md
@@ -19,7 +19,7 @@ _Extension to [`Command`](https://doc.rust-lang.org/std/process/struct.Command.h
 
 ```toml
 [dependencies]
-command-group = "3.0.0"
+command-group = "4.0.0"
 ```
 
 ```rust
@@ -35,7 +35,7 @@ dbg!(status);
 
 ```toml
 [dependencies]
-command-group = { version = "3.0.0", features = ["with-tokio"] }
+command-group = { version = "4.0.0", features = ["with-tokio"] }
 tokio = { version = "1.10.0", features = ["full"] }
 ```