diff --git a/.styleci.yml b/.styleci.yml
index 0f9c088..7f00acc 100644
--- a/.styleci.yml
+++ b/.styleci.yml
@@ -1,8 +1,4 @@
-preset: psr2
-
-finder:
-  exclude:
-    - "tests"
+preset: psr12
 
 enabled:
   - no_unneeded_control_parentheses
diff --git a/composer.json b/composer.json
index 5dd8a1e..fd0ca50 100644
--- a/composer.json
+++ b/composer.json
@@ -1,14 +1,17 @@
 {
   "name": "rogervila/array-diff-multidimensional",
   "description": "Compare the difference between two multidimensional arrays",
-  "type": "library",
   "license": "MIT",
+  "type": "library",
   "authors": [
     {
       "name": "Roger Vilà",
       "email": "rogervila@me.com"
     }
   ],
+  "require-dev": {
+    "phpunit/phpunit": "^4.8 || ^5.0 || ^6.0 || ^7.0 || ^8.0 || ^9.0 || ^10.0"
+  },
   "autoload": {
     "psr-4": {
       "Rogervila\\": "src/"
@@ -16,13 +19,5 @@
     "files": [
       "src/helpers.php"
     ]
-  },
-  "autoload-dev": {
-    "psr-4": {
-      "Rogervila\\Tests\\": "tests/"
-    }
-  },
-  "require-dev": {
-    "phpunit/phpunit": "^4.8 || ^5.0 || ^6.0 || ^7.0 || ^8.0 || ^9.0"
   }
 }
diff --git a/src/helpers.php b/src/helpers.php
index 14a69ce..e9a2ec9 100644
--- a/src/helpers.php
+++ b/src/helpers.php
@@ -3,7 +3,6 @@
 use Rogervila\ArrayDiffMultidimensional;
 
 if (!function_exists('array_diff_multidimensional')) {
-
     /**
      * Returns an array with the differences between $array1 and $array2
      * $strict variable defines if comparison must be strict or not
diff --git a/tests/ArrayCompareTest.php b/tests/ArrayCompareTest.php
index 1bd474e..b09c5c9 100644
--- a/tests/ArrayCompareTest.php
+++ b/tests/ArrayCompareTest.php
@@ -1,7 +1,5 @@
 <?php
 
-namespace Rogervila\Test;
-
 use PHPUnit\Framework\TestCase;
 use Rogervila\ArrayDiffMultidimensional;
 
diff --git a/tests/HelperFunctionTest.php b/tests/HelperFunctionTest.php
index 060d637..c564f65 100644
--- a/tests/HelperFunctionTest.php
+++ b/tests/HelperFunctionTest.php
@@ -1,7 +1,5 @@
 <?php
 
-namespace Rogervila\Test;
-
 use PHPUnit\Framework\TestCase;
 
 class HelperFunctionTest extends TestCase