diff --git a/CHANGELOG.md b/CHANGELOG.md
index e659605..c086e01 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -37,6 +37,13 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
   [#324](https://github.com/ramsey/uuid/pull/324) for more information.
 
 
+## 4.0.2 - 2021-09-24
+
+### Fixed
+
+* Lock 4.0.x to `~8.0.0` to indicate it does not support PHP 8.1.
+
+
 ## [4.0.1] - 2020-03-29
 
 ### Fixed
diff --git a/composer.json b/composer.json
index 41d500b..0a42c7a 100644
--- a/composer.json
+++ b/composer.json
@@ -10,7 +10,7 @@
     "homepage": "https://github.com/ramsey/uuid",
     "license": "MIT",
     "require": {
-        "php": "^7.2 || ^8",
+        "php": "^7.2 || ~8.0.0",
         "ext-json": "*",
         "brick/math": "^0.8 || ^0.9",
         "ramsey/collection": "^1.0",