diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index f653150..6d6f5c5 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -8,7 +8,7 @@ jobs:
 
     strategy:
       matrix:
-        php: [7.1, 7.2, 7.3, 7.4, 8.0]
+        php: [7.4, 8.0, 8.1]
 
     steps:
     - name: Checkout code
diff --git a/composer.json b/composer.json
index 0b5911b..6dfb60a 100644
--- a/composer.json
+++ b/composer.json
@@ -12,7 +12,7 @@
 	],
 	"minimum-stability": "RC",
 	"require": {
-		"php": "^7.1 || ^8.0",
+		"php": "^7.4 || ^8.0",
 		"codeception/codeception": "^4.0",
 		"league/factory-muffin": "^3.0",
 		"league/factory-muffin-faker": "^2.1"
diff --git a/readme.md b/readme.md
index dc77128..11ac0e5 100644
--- a/readme.md
+++ b/readme.md
@@ -9,7 +9,7 @@ A data factory module for Codeception.
 
 ## Requirements
 
-* `PHP 7.1` or higher.
+* `PHP 7.4` or higher.
 
 ## Installation
 
diff --git a/src/Codeception/Module/DataFactory.php b/src/Codeception/Module/DataFactory.php
index 7f0acdc..272400e 100644
--- a/src/Codeception/Module/DataFactory.php
+++ b/src/Codeception/Module/DataFactory.php
@@ -158,10 +158,7 @@
  */
 class DataFactory extends \Codeception\Module implements DependsOnModule, RequiresPackage
 {
-    /**
-     * @var string
-     */
-    protected $dependencyMessage = <<<EOF
+    protected string $dependencyMessage = <<<EOF
 ORM module (like Doctrine2) or Framework module with ActiveRecord support is required:
 --
 modules:
@@ -173,15 +170,10 @@ class DataFactory extends \Codeception\Module implements DependsOnModule, Requir
 
     /**
      * ORM module on which we we depend on.
-     *
-     * @var ORM
      */
-    public $ormModule;
+    public ?ORM $ormModule = null;
 
-    /**
-     * @var FactoryMuffin
-     */
-    public $factoryMuffin;
+    public ?FactoryMuffin $factoryMuffin = null;
 
     /**
      * @var array
@@ -191,7 +183,7 @@ class DataFactory extends \Codeception\Module implements DependsOnModule, Requir
     public function _requires()
     {
         return [
-            \League\FactoryMuffin\FactoryMuffin::class => '"league/factory-muffin": "^3.0"',
+            FactoryMuffin::class => '"league/factory-muffin": "^3.0"',
         ];
     }
 
@@ -206,15 +198,13 @@ public function _beforeSuite($settings = [])
                 if ($realpath === false) {
                     throw new ModuleException($this, 'The path to one of your factories is not correct. Please specify the directory relative to the codeception.yml file (ie. _support/factories).');
                 }
+
                 $this->factoryMuffin->loadFactories($realpath);
             }
         }
     }
 
-    /**
-     * @return StoreInterface|null
-     */
-    protected function getStore()
+    protected function getStore(): ?StoreInterface
     {
         if (!empty($this->config['customStore'])) {
             $store = new $this->config['customStore'];
@@ -242,18 +232,19 @@ public function _after(TestInterface $test)
         if ($skipCleanup) {
             return;
         }
+
         if ($cleanupOrmModule_Config) {
             return;
         }
+
         $this->factoryMuffin->deleteSaved();
     }
 
     public function _depends()
     {
-        return [\Codeception\Lib\Interfaces\ORM::class => $this->dependencyMessage];
+        return [ORM::class => $this->dependencyMessage];
     }
 
-
     /**
      * @throws ModuleException
      */
@@ -263,6 +254,7 @@ public function onReconfigure($settings = [])
         if (!$skipCleanup && !$this->ormModule->_getConfig('cleanup')) {
             $this->factoryMuffin->deleteSaved();
         }
+
         $this->_beforeSuite($settings);
     }
 
@@ -274,7 +266,6 @@ public function onReconfigure($settings = [])
      *     'name' => $faker->name,
      *     'email' => $faker->email
      * ]);
-     *
      * ```
      *
      * @throws \League\FactoryMuffin\Exceptions\DefinitionAlreadyDefinedException
@@ -293,10 +284,8 @@ public function _define(string $model, array $fields): Definition
      * ```
      *
      * Returns an instance of created user.
-     *
-     * @return object
      */
-    public function have(string $name, array $extraAttrs = [])
+    public function have(string $name, array $extraAttrs = []): object
     {
         return $this->factoryMuffin->create($name, $extraAttrs);
     }
@@ -312,10 +301,8 @@ public function have(string $name, array $extraAttrs = [])
      * ```
      *
      * Returns an instance of created user without creating a record in database.
-     *
-     * @return object
      */
-    public function make(string $name, array $extraAttrs = [])
+    public function make(string $name, array $extraAttrs = []): object
     {
         return $this->factoryMuffin->instance($name, $extraAttrs);
     }