diff --git a/.travis.yml b/.travis.yml
index a69f692..ad8d6be 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -10,6 +10,7 @@ php:
     - 7.2
     - 7.3
     - 7.4
+    - 8.0
 
 before_install:
     - composer self-update
diff --git a/composer.json b/composer.json
index 309239b..928eac5 100644
--- a/composer.json
+++ b/composer.json
@@ -20,14 +20,14 @@
     }
   },
   "require": {
-    "php": "^7.2.5",
+    "php": "^7.2.5|^8.0",
     "symfony/form": "^4.4|^5.0",
     "symfony/translation": "^4.4|^5.0",
     "symfony/serializer": "^4.4|^5.0",
     "symfony/contracts": "^1.0|^2.1"
   },
   "require-dev": {
-    "dealerdirect/phpcodesniffer-composer-installer": "^0.6.2",
+    "dealerdirect/phpcodesniffer-composer-installer": "^v0.7.1",
     "escapestudios/symfony2-coding-standard": "^3.0",
     "phpunit/phpunit": "^8.0",
     "phpcompatibility/php-compatibility": "^9.3"
diff --git a/src/Limenius/Liform/Transformer/AbstractTransformer.php b/src/Limenius/Liform/Transformer/AbstractTransformer.php
index cf812d9..041ba5e 100644
--- a/src/Limenius/Liform/Transformer/AbstractTransformer.php
+++ b/src/Limenius/Liform/Transformer/AbstractTransformer.php
@@ -75,7 +75,7 @@ protected function applyExtensions(array $extensions, FormInterface $form, array
      *
      * @return array
      */
-    protected function addCommonSpecs(FormInterface $form, array $schema, $extensions = [], $widget)
+    protected function addCommonSpecs(FormInterface $form, array $schema, $extensions = [], $widget = null)
     {
         $schema = $this->addLabel($form, $schema);
         $schema = $this->addAttr($form, $schema);