diff --git a/.github/workflows/checks.yml b/.github/workflows/checks.yml
index d536982..c1c6d8f 100644
--- a/.github/workflows/checks.yml
+++ b/.github/workflows/checks.yml
@@ -32,7 +32,7 @@ jobs:
         strategy:
             fail-fast: false
             matrix:
-                php-version: [ '7.2', '7.3', '7.4', '8.0', '8.1', '8.2' ]
+                php-version: [ '7.2', '7.3', '7.4', '8.0', '8.1', '8.2', '8.3' ]
                 dependency-version: [ prefer-lowest, prefer-stable ]
                 operating-system: [ ubuntu-latest, windows-latest ]
         steps:
diff --git a/README.md b/README.md
index cf285f5..3c095e8 100644
--- a/README.md
+++ b/README.md
@@ -48,5 +48,5 @@ And in such cases, the test may work when executed in standalone run, but fail w
 Therefore, having a collision detector in CI might be useful.
 
 ## Supported PHP versions
-- PHP 7.2 - PHP 8.2
+- PHP 7.2 - PHP 8.3