diff --git a/.github/workflows/benchmark.yaml b/.github/workflows/benchmark.yaml
index 18679da..7a49c2c 100644
--- a/.github/workflows/benchmark.yaml
+++ b/.github/workflows/benchmark.yaml
@@ -17,6 +17,7 @@ jobs:
         php-version:
           - "7.4"
           - "8.3"
+          - "8.6"
 
     steps:
       - name: Checkout code
diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 2fc0a8b..74a5165 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -22,6 +22,7 @@ jobs:
           - "8.3"
           - "8.4"
           - "8.5"
+          - "8.6"
 
     steps:
       - name: Checkout code
diff --git a/.github/workflows/cs.yaml b/.github/workflows/cs.yaml
index b06399c..52b4e33 100644
--- a/.github/workflows/cs.yaml
+++ b/.github/workflows/cs.yaml
@@ -27,6 +27,8 @@ jobs:
           php-version: ${{ matrix.php-version }}
 
       - name: cs fix
+        env:
+          PHP_CS_FIXER_IGNORE_ENV: "1"
         run: |
           wget -q https://github.com/FriendsOfPHP/PHP-CS-Fixer/releases/download/v2.19.3/php-cs-fixer.phar 
           php php-cs-fixer.phar fix --dry-run --diff
diff --git a/test/HTML5/Serializer/OutputRulesTest.php b/test/HTML5/Serializer/OutputRulesTest.php
index bee5978..a410894 100644
--- a/test/HTML5/Serializer/OutputRulesTest.php
+++ b/test/HTML5/Serializer/OutputRulesTest.php
@@ -44,7 +44,9 @@ public function getProtectedMethod($name)
     {
         $class = new \ReflectionClass('\Masterminds\HTML5\Serializer\OutputRules');
         $method = $class->getMethod($name);
-        $method->setAccessible(true);
+        if (\PHP_VERSION_ID < 80500) {
+            $method->setAccessible(true);
+        }
 
         return $method;
     }
diff --git a/test/HTML5/Serializer/TraverserTest.php b/test/HTML5/Serializer/TraverserTest.php
index 09d7142..dd90d17 100644
--- a/test/HTML5/Serializer/TraverserTest.php
+++ b/test/HTML5/Serializer/TraverserTest.php
@@ -43,7 +43,9 @@ public function getProtectedMethod($name)
     {
         $class = new \ReflectionClass('\Masterminds\HTML5\Serializer\Traverser');
         $method = $class->getMethod($name);
-        $method->setAccessible(true);
+        if (\PHP_VERSION_ID < 80500) {
+            $method->setAccessible(true);
+        }
 
         return $method;
     }