diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index a74131b..6ea45b0 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -12,9 +12,11 @@ jobs:
     strategy:
       matrix:
         php-versions:
+          - 8.5
+          - 8.4
+          - 8.3
           - 8.2
           - 8.1
-          - 8.0
 
     name: PHP ${{ matrix.php-versions }}
     steps:
diff --git a/composer.json b/composer.json
index 1670246..cc6b7ae 100644
--- a/composer.json
+++ b/composer.json
@@ -28,11 +28,11 @@
   },
   "config": {
     "platform": {
-      "php": "8.0"
+      "php": "8.1"
     }
   },
   "require": {
-    "php": "^8.0",
+    "php": "^8.1",
     "ext-json": "*"
   },
   "require-dev": {
diff --git a/phpstan.neon.dist b/phpstan.neon.dist
index 1c52932..1ff9017 100644
--- a/phpstan.neon.dist
+++ b/phpstan.neon.dist
@@ -1,6 +1,5 @@
 parameters:
     level: max
-    checkGenericClassInNonGenericObjectType: false
     paths:
         - src
     ignoreErrors:
diff --git a/src/BinaryFlags.php b/src/BinaryFlags.php
index c937d79..cf03eee 100644
--- a/src/BinaryFlags.php
+++ b/src/BinaryFlags.php
@@ -11,6 +11,8 @@
  * This class holds useful methods for checking, adding or removing binary flags
  *
  * @author Reinder
+ *
+ * @implements Iterator<int|float, string>
  */
 abstract class BinaryFlags implements Iterator, Countable, JsonSerializable
 {