diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index b5b9f8a..d6f7f5d 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -8,7 +8,7 @@ jobs:
 
     strategy:
       matrix:
-        php: [7.3, 7.4, 8.0]
+        php: [7.4, 8.0, 8.1]
 
     steps:
     - name: Checkout code
@@ -26,4 +26,4 @@ jobs:
       run: composer update --prefer-dist --no-progress --no-interaction
 
     - name: Run test suite
-      run: php vendor/bin/phpunit 
+      run: php vendor/bin/phpunit
diff --git a/README.md b/README.md
index 74c4d2a..25b3622 100644
--- a/README.md
+++ b/README.md
@@ -13,7 +13,7 @@ Inspired by MiniTest of Ruby now you combine BDD and classical TDD style in one
 
 ## Installation
 
-*Requires PHP >= 7.3*
+*Requires PHP >= 7.4*
 
 * Install with Composer:
 
diff --git a/composer.json b/composer.json
index 4b9e0b6..3ac90fb 100644
--- a/composer.json
+++ b/composer.json
@@ -14,7 +14,7 @@
         }
     ],
     "require": {
-        "php": ">=7.3.0",
+        "php": ">=7.4.0",
         "myclabs/deep-copy": "^1.10",
         "phpunit/phpunit": "^8.0|^9.0"
     },
diff --git a/src/Codeception/Specify.php b/src/Codeception/Specify.php
index 81cfc72..72d49f0 100644
--- a/src/Codeception/Specify.php
+++ b/src/Codeception/Specify.php
@@ -23,6 +23,7 @@ public function specify(string $thing, Closure $code = null, $examples = []): ?s
             $this->runSpec($thing, $code, $examples);
             return null;
         }
+
         return $this;
     }
 
@@ -32,6 +33,7 @@ public function describe(string $feature, Closure $code = null): ?self
             $this->runSpec($feature, $code);
             return null;
         }
+
         return $this;
     }
 
@@ -41,6 +43,7 @@ public function it(string $specification, Closure $code = null, $examples = []):
             $this->runSpec($specification, $code, $examples);
             return $this;
         }
+
         TestCase::markTestIncomplete();
         return $this;
     }
@@ -56,6 +59,7 @@ public function should(string $behavior, Closure $code = null, $examples = []):
             $this->runSpec('should ' . $behavior, $code, $examples);
             return $this;
         }
+
         TestCase::markTestIncomplete();
         return $this;
     }
@@ -66,6 +70,7 @@ public function shouldNot(string $behavior, Closure $code = null, $examples = []
             $this->runSpec('should not ' . $behavior, $code, $examples);
             return $this;
         }
+
         TestCase::markTestIncomplete();
         return $this;
     }
diff --git a/src/Codeception/Specify/ObjectProperty.php b/src/Codeception/Specify/ObjectProperty.php
index 691d342..e334c77 100644
--- a/src/Codeception/Specify/ObjectProperty.php
+++ b/src/Codeception/Specify/ObjectProperty.php
@@ -46,7 +46,7 @@ public function __construct($owner, $property, $value = null)
 
         $this->property->setAccessible(true);
 
-        $this->initValue = ($value === null ? $this->getValue() : $value);
+        $this->initValue = ($value ?? $this->getValue());
     }
 
     public function getName(): string
@@ -57,7 +57,7 @@ public function getName(): string
     /**
      * Restores initial value
      */
-    public function restoreValue()
+    public function restoreValue(): void
     {
         $this->setValue($this->initValue);
     }
@@ -73,7 +73,7 @@ public function getValue()
     /**
      * @param mixed $value
      */
-    public function setValue($value)
+    public function setValue($value): void
     {
         $this->property->setValue($this->owner, $value);
     }
diff --git a/src/Codeception/Specify/ResultPrinter.php b/src/Codeception/Specify/ResultPrinter.php
index 4ab43be..227dc4d 100644
--- a/src/Codeception/Specify/ResultPrinter.php
+++ b/src/Codeception/Specify/ResultPrinter.php
@@ -15,13 +15,11 @@ class ResultPrinter extends DefaultResultPrinter
     protected function writeProgress(string $progress): void
     {
         $this->write($progress);
-        $this->column++;
-        $this->numTestsRun++;
+        ++$this->column;
+        ++$this->numTestsRun;
 
-        if ($this->column == $this->maxColumn || $this->numTestsRun == $this->numTests) {
-            if ($this->column == $this->maxColumn) {
-                $this->writeNewLine();
-            }
+        if ($this->column === $this->maxColumn) {
+            $this->writeNewLine();
         }
     }
 }
diff --git a/src/Codeception/Specify/SpecifyHooks.php b/src/Codeception/Specify/SpecifyHooks.php
index 6543c97..d84d5c9 100644
--- a/src/Codeception/Specify/SpecifyHooks.php
+++ b/src/Codeception/Specify/SpecifyHooks.php
@@ -15,21 +15,15 @@
 
 trait SpecifyHooks
 {
-    private $afterSpecify = [];
+    private array $afterSpecify = [];
 
-    private $beforeSpecify = [];
+    private array $beforeSpecify = [];
 
-    /**
-     * @var DeepCopy
-     */
-    private $copier;
+    private ?DeepCopy $copier = null;
 
-    /**
-     * @var SpecifyTest
-     */
-    private $currentSpecifyTest;
+    private ?SpecifyTest $currentSpecifyTest = null;
 
-    private $specifyName = '';
+    private string $specifyName = '';
 
     private function getCurrentSpecifyTest(): SpecifyTest
     {
@@ -43,7 +37,7 @@ private function getCurrentSpecifyTest(): SpecifyTest
      */
     private function runSpec(string $specification, Closure $callable = null, $params = [])
     {
-        if (!$callable) {
+        if ($callable === null) {
             return;
         }
 
@@ -106,8 +100,10 @@ private function getSpecifyExamples($params): array
             if (!is_array($params['examples'])) {
                 throw new RuntimeException("Examples should be an array");
             }
+
             return $params['examples'];
         }
+
         return [[]];
     }
 
@@ -116,6 +112,7 @@ private function specifyGetPhpUnitReflection(): ?ReflectionClass
         if ($this instanceof TestCase) {
             return new ReflectionClass(TestCase::class);
         }
+
         return null;
     }
 
@@ -161,7 +158,8 @@ private function getSpecifyObjectProperties(): array
             if (!$docBlock) {
                 continue;
             }
-            if (preg_match('~\*(\s+)?@specify\s?~', $docBlock)) {
+
+            if (preg_match('#\*(\s+)?@specify\s?#', $docBlock)) {
                 $property->setAccessible(true);
                 $clonedProperties[] = new ObjectProperty($this, $property);
             }
diff --git a/src/Codeception/Specify/SpecifyTest.php b/src/Codeception/Specify/SpecifyTest.php
index 383d011..57522ba 100644
--- a/src/Codeception/Specify/SpecifyTest.php
+++ b/src/Codeception/Specify/SpecifyTest.php
@@ -12,25 +12,29 @@
 
 class SpecifyTest implements Test, SelfDescribing
 {
-    protected $name;
+    protected string $name = '';
 
-    protected $test;
+    /** @var callable */
+    protected $test = null;
 
-    protected $example;
+    protected array $example = [];
 
+    /**
+     * @var mixed|null
+     */
     protected $throws;
 
-    public function __construct($test)
+    public function __construct(callable $test)
     {
         $this->test = $test;
     }
 
-    public function setName($name)
+    public function setName(string $name): void
     {
         $this->name = $name;
     }
 
-    public function toString() : string
+    public function toString(): string
     {
         return $this->name;
     }
@@ -49,8 +53,7 @@ public function getName($withDataSet = true): string
      * Count elements of an object
      * @link http://php.net/manual/en/countable.count.php
      * @return int The custom count as an integer.
-     * </p>
-     * <p>
+     *
      * The return value is cast to an integer.
      * @since 5.1.0
      */
@@ -61,25 +64,19 @@ public function count(): int
 
     /**
      * Runs a test and collects its result in a TestResult instance.
-     *
-     * @param TestResult|null $result
-     *
-     * @return TestResult
      */
     public function run(TestResult $result = null): TestResult
     {
         try {
             call_user_func_array($this->test, $this->example);
-        } catch (AssertionFailedError $e) {
-            $result->addFailure(clone($this), $e, $result->time());
+        } catch (AssertionFailedError $error) {
+            $result->addFailure(clone($this), $error, $result->time());
         }
+
         return $result;
     }
 
-    /**
-     * @param mixed $example
-     */
-    public function setExample($example)
+    public function setExample(array $example): void
     {
         $this->example = $example;
     }
@@ -87,7 +84,7 @@ public function setExample($example)
     /**
      * @param mixed $throws
      */
-    public function setThrows($throws)
+    public function setThrows($throws): void
     {
         $this->throws = $throws;
     }
diff --git a/tests/ObjectPropertyTest.php b/tests/ObjectPropertyTest.php
index c7e07a6..fbfb39e 100644
--- a/tests/ObjectPropertyTest.php
+++ b/tests/ObjectPropertyTest.php
@@ -6,6 +6,8 @@
 
 final class ObjectPropertyTest extends SpecifyUnitTest
 {
+    private ?string $prop = null;
+
     private $private = 'private';
 
     public function testConstruction()
diff --git a/tests/SpecifyTest.php b/tests/SpecifyTest.php
index 717a2df..d1c7ae2 100644
--- a/tests/SpecifyTest.php
+++ b/tests/SpecifyTest.php
@@ -14,7 +14,7 @@ class SpecifyTest extends SpecifyUnitTest
     /**
      * @specify
      */
-    protected $a;
+    protected ?TestOne $a = null;
 
     /**
      * @specify
@@ -24,7 +24,7 @@ class SpecifyTest extends SpecifyUnitTest
     /**
      * not cloned
      */
-    protected $b;
+    protected ?string $b = null;
 
     public function testUserCanChangeName()
     {
@@ -41,13 +41,14 @@ public function testUserCanChangeName()
             $this->specify('i can fail here but test goes on', function() {
                 $this->markTestIncomplete();
             });
-        } catch (IncompleteTestError $e) {
+        } catch (IncompleteTestError $error) {
             $this->fail("should not be thrown");
         }
+
         $this->assertTrue(true);
     }
 
-    function testBeforeCallback()
+    public function testBeforeCallback()
     {
         $this->beforeSpecify(function() {
             $this->user = "davert";
@@ -57,7 +58,7 @@ function testBeforeCallback()
         });
     }
 
-    function testMultiBeforeCallback()
+    public function testMultiBeforeCallback()
     {
         $this->beforeSpecify(function() {
             $this->user = "davert";
@@ -70,7 +71,7 @@ function testMultiBeforeCallback()
         });
     }
 
-    function testAfterCallback()
+    public function testAfterCallback()
     {
         $this->afterSpecify(function() {
             $this->user = "davert";
@@ -81,7 +82,7 @@ function testAfterCallback()
         $this->assertEquals('davert', $this->user);
     }
 
-    function testMultiAfterCallback()
+    public function testMultiAfterCallback()
     {
         $this->afterSpecify(function() {
             $this->user = "davert";
@@ -95,7 +96,7 @@ function testMultiAfterCallback()
         $this->assertEquals('davertjon', $this->user);
     }
 
-    function testCleanSpecifyCallbacks()
+    public function testCleanSpecifyCallbacks()
     {
         $this->afterSpecify(function() {
             $this->user = "davert";
@@ -117,7 +118,7 @@ public function testExamples()
         ]]);
     }
 
-    function testOnlySpecifications()
+    public function testOnlySpecifications()
     {
         $this->specify('should be valid');
         $this->assertTrue(true);
@@ -205,9 +206,9 @@ public function testCloneOnlySpecified()
     /**
      * @Issue https://github.com/Codeception/Specify/issues/6
      */
-    function testPropertyRestore()
+    public function testPropertyRestore()
     {
-        $this->a = new testOne();
+        $this->a = new TestOne();
         $this->a->prop = ['hello', 'world'];
 
         $this->specify('array contains hello+world', function ($testData) {
@@ -223,9 +224,9 @@ function testPropertyRestore()
         $this->assertTrue($this->getPrivateProperty());
 
         $this->specify('property $private should be restored properly', function() {
-            $this->private = 'i\'m protected';
-            $this->setPrivateProperty('i\'m private');
-            $this->assertEquals('i\'m private', $this->getPrivateProperty());
+            $this->private = "i'm protected";
+            $this->setPrivateProperty("i'm private");
+            $this->assertEquals("i'm private", $this->getPrivateProperty());
         });
 
         $this->assertFalse($this->private);
@@ -310,7 +311,7 @@ public function testMockObjectsIsolation()
     /**
      * @dataProvider someData
      */
-    public function testSpecifyAndDataProvider($param)
+    public function testSpecifyAndDataProvider(int $param)
     {
         $this->specify('should assert data provider', function () use ($param) {
             $this->assertGreaterThan(0, $param);
@@ -320,14 +321,14 @@ public function testSpecifyAndDataProvider($param)
     /**
      * @dataProvider someData
      */
-    public function testExamplesAndDataProvider($param)
+    public function testExamplesAndDataProvider(int $param)
     {
         $this->specify('should assert data provider', function ($example) use ($param) {
             $this->assertGreaterThanOrEqual(5, $param + $example);
         }, ['examples' => [[4], [7], [5]]]);
     }
 
-    public function someData()
+    public function someData(): array
     {
         return [[1], [2]];
     }
diff --git a/tests/_support/SpecifyUnitTest.php b/tests/_support/SpecifyUnitTest.php
index 3a4ff93..060c2a8 100644
--- a/tests/_support/SpecifyUnitTest.php
+++ b/tests/_support/SpecifyUnitTest.php
@@ -20,6 +20,7 @@ protected function setPrivateProperty($private)
     {
         $this->private = $private;
     }
+
     /**
      * @return mixed
      */