diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 0b54345a..61c3324c 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -13,7 +13,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        php-versions: [ '5.3', '5.4', '5.5', '5.6', '7.0', '7.1', '7.2', '7.3', '7.4', '8.0', '8.1', '8.2' ]
+        php-versions: [ '5.3', '5.4', '5.5', '5.6', '7.0', '7.1', '7.2', '7.3', '7.4', '8.0', '8.1', '8.2', '8.3' ]
     name: Run Unit Test on PHP ${{ matrix.php-versions }}
     steps:
     - name: Checkout
diff --git a/CHANGELOG.md b/CHANGELOG.md
index e3d0788f..30e7346f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,7 +10,7 @@ All notable changes to `Slytherin` will be documented in this file.
 - `RouteInterface` for handling specific routes
 - Support for all versions of `http-interop/http-middleware` (`0.3`, `0.4`, `0.5`)
 - `ERRATUM.md` for changes in `README.md` for specified versions
-- `UPGRADE.md` for documentation on how to upgrade versions with BC breaks
+- Support versions for PHP `v8.3`
 
 ### Changed
 - Third-party packages in `Routing` extends to Slytherin's `Dispatcher`, `Router`