diff --git a/.php-cs-fixer.php b/.php-cs-fixer.php
deleted file mode 100644
index 0bd3720..0000000
--- a/.php-cs-fixer.php
+++ /dev/null
@@ -1,18 +0,0 @@
-<?php
-
-$finder = PhpCsFixer\Finder::create()
-    ->exclude([
-        'demo',
-        'fonts',
-    ])
-    ->in(__DIR__)
-;
-
-$config = new PhpCsFixer\Config();
-
-return $config->setRules([
-        '@PSR12' => true,
-        'array_syntax' => ['syntax' => 'short'],
-    ])
-    ->setFinder($finder)
-;
diff --git a/composer.json b/composer.json
index 5c59571..0956fe0 100644
--- a/composer.json
+++ b/composer.json
@@ -7,8 +7,7 @@
     "keywords": ["captcha", "anti-spam", "spam-protection", "spam", "obfuscation", "security", "anti-bot", "no-bot", "bot-protection"],
     "homepage": "https://codeberg.org/S1SYPHOS/php-simple-captcha",
     "scripts": {
-        "cs-dry": "php-cs-fixer fix --dry-run --diff",
-        "cs-fix": "php-cs-fixer fix",
+        "lint": "pint --verbose",
         "test": "phpunit"
     },
     "authors": [
@@ -39,9 +38,10 @@
         "thiagoalessio/tesseract_ocr": "Provides better results when building against OCR. Requires 'tesseract-ocr' to be installed."
     },
     "require-dev": {
-        "friendsofphp/php-cs-fixer": "^3.4",
+        "laravel/pint": "^1.1",
         "phpunit/phpunit": "^8.5|^9.0",
-        "mikey179/vfsstream": "^1.6"
+        "mikey179/vfsstream": "^1.6",
+        "vimeo/psalm": "^4.26"
     },
     "autoload": {
         "psr-4": {
diff --git a/demo/demo.php b/demo/demo.php
index 2ebc91d..8cc6f6b 100644
--- a/demo/demo.php
+++ b/demo/demo.php
@@ -14,4 +14,5 @@
     F::remove($file);
 }
 
-Builder::create()->build()->save('tmp/out.jpg');;
+Builder::create()->build()->save('tmp/out.jpg');
+;
diff --git a/demo/form.php b/demo/form.php
index 39b6e5f..589b0bb 100644
--- a/demo/form.php
+++ b/demo/form.php
@@ -28,15 +28,13 @@
 
                 if (isset($_SESSION['phrase']) && $captcha->compare($_SESSION['phrase'], $_POST['phrase'])) {
                     echo 'Captcha is valid!';
-                }
-
-                else {
+                } else {
                     echo 'Captcha is invalid!';
                 }
 
                 # Delete phrase stored in session
                 unset($_SESSION['phrase']);
             }
-        ?>
+?>
     </body>
 </html>
diff --git a/demo/ocr.php b/demo/ocr.php
index 3135414..2705525 100644
--- a/demo/ocr.php
+++ b/demo/ocr.php
@@ -23,7 +23,7 @@
 for ($i = 0; $i < $total; $i++) {
     echo sprintf('Captcha %s/%s ..', $i + 1, $total);
 
-    $captcha = new Builder;
+    $captcha = new Builder();
     $captcha->distortion = false;
     $captcha->build();
 
@@ -34,9 +34,7 @@
         $captcha->save("tmp/passed-$passed.jpg");
 
         echo ' passed!<br>';
-    }
-
-    else {
+    } else {
         echo ' failed!<br>';
     }
 
diff --git a/phpunit.xml b/phpunit.xml
index 4926dfd..03bd70f 100644
--- a/phpunit.xml
+++ b/phpunit.xml
@@ -1,16 +1,27 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd" backupGlobals="false" backupStaticAttributes="false" colors="true" convertErrorsToExceptions="true" convertNoticesToExceptions="true" convertWarningsToExceptions="true" processIsolation="false" stopOnFailure="false" bootstrap="vendor/autoload.php">
-  <coverage>
-    <include>
-      <directory>./</directory>
-    </include>
-    <exclude>
-      <directory>./vendor</directory>
-    </exclude>
-  </coverage>
-  <testsuites>
-    <testsuite name="Captcha Test Suite">
-      <directory>./tests/</directory>
-    </testsuite>
-  </testsuites>
+<phpunit
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd"
+
+    bootstrap="vendor/autoload.php"
+    colors="true"
+    verbose="true"
+    stderr="true"
+>
+    <coverage ignoreDeprecatedCodeUnits="true">
+        <include>
+            <directory>./src</directory>
+        </include>
+        <exclude>
+            <directory>./vendor</directory>
+        </exclude>
+    </coverage>
+    <testsuites>
+        <testsuite name="Tests">
+            <directory>./tests/</directory>
+        </testsuite>
+    </testsuites>
+    <php>
+        <ini name="memory_limit" value="2048M" />
+    </php>
 </phpunit>
diff --git a/pint.json b/pint.json
new file mode 100644
index 0000000..5f414fb
--- /dev/null
+++ b/pint.json
@@ -0,0 +1,7 @@
+{
+    "preset": "psr12",
+    "rules": {},
+    "exclude": [
+        "src/Helpers"
+    ]
+}
diff --git a/psalm.xml b/psalm.xml
new file mode 100644
index 0000000..c6b2562
--- /dev/null
+++ b/psalm.xml
@@ -0,0 +1,16 @@
+<?xml version="1.0"?>
+<psalm
+    errorLevel="7"
+    resolveFromConfigFile="true"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xmlns="https://getpsalm.org/schema/config"
+    xsi:schemaLocation="https://getpsalm.org/schema/config vendor/vimeo/psalm/config.xsd"
+>
+    <projectFiles>
+        <directory name="src" />
+        <ignoreFiles>
+            <directory name="src/Helpers" />
+            <directory name="vendor" />
+        </ignoreFiles>
+    </projectFiles>
+</psalm>
diff --git a/src/Builder.php b/src/Builder.php
index 210a0ad..e8f9281 100644
--- a/src/Builder.php
+++ b/src/Builder.php
@@ -10,6 +10,8 @@
 use SimpleCaptcha\Helpers\Str;
 use SimpleCaptcha\Helpers\Mime;
 
+use \thiagoalessio\TesseractOCR\TesseractOCR;
+
 use GdImage;
 use resource;
 use Exception;
@@ -299,25 +301,25 @@ private function drawLine(?int $color = null): void
      */
     private function applyNoise(): void
     {
-		for ($i = 0; $i < Str::length($this->phrase) * $this->noiseFactor; $i++) {
+        for ($i = 0; $i < Str::length($this->phrase) * $this->noiseFactor; $i++) {
             # Determine random letter ..
-			$character = static::randomCharacter();
+            $character = static::randomCharacter();
             $font = $this->randomFont();
 
             # .. of random size & color, ..
-			$fontSize = mt_rand(5, 10);
+            $fontSize = mt_rand(5, 10);
             $textColor = imagecolorallocate($this->image, mt_rand(0, 128), mt_rand(0, 128), mt_rand(0, 128));
 
             # .. random position ..
             $x = mt_rand(0, $this->width);
-			$y = mt_rand(0, $this->height);
+            $y = mt_rand(0, $this->height);
 
             # .. random angle ..
-			$angle = mt_rand(-45, 45);
+            $angle = mt_rand(-45, 45);
 
             # .. and apply it
-			imagettftext($this->image, $fontSize, $angle, $x, $y, $textColor, $font, $character);
-		}
+            imagettftext($this->image, $fontSize, $angle, $x, $y, $textColor, $font, $character);
+        }
     }
 
 
@@ -545,7 +547,6 @@ private function distort(): void
                     $Vn2 = $Vn + 4 * sin($Vn / 30);
                     $nX  = $X + ($Vx * $Vn2 / $Vn);
                     $nY  = $Y + ($Vy * $Vn2 / $Vn);
-
                 } else {
                     $nX = $X;
                     $nY = $Y;
@@ -562,7 +563,6 @@ private function distort(): void
                         $this->pixel2int(floor($nX), ceil($nY)),
                         $this->pixel2int(ceil($nX), ceil($nY))
                     );
-
                 } else {
                     $p = $this->pixel2int($this->round($nX), $this->round($nY));
                 }
@@ -695,12 +695,12 @@ public function build(int $width = 150, int $height = 40): self
      * See https://priteshgupta.com/2011/09/advanced-image-functions-using-php
      * See https://github.com/raoulduke/phpocrad
      *
-     * @param string $file Output file
+     * @param string $output Output file
      * @param int $amount
      * @param int $threshold
      * @return void
      */
-    private function img2ocr(?string $output = null, int $amount = 80, int $threshold = 3): void
+    private function img2ocr(string $output, int $amount = 80, int $threshold = 3): void
     {
         $image = $this->image;
 
@@ -752,9 +752,7 @@ private function img2ocr(?string $output = null, int $amount = 80, int $threshol
                     }
                 }
             }
-        }
-
-        else {
+        } else {
             for ($x = 0; $x < $this->width; $x++) { # each row
                 for ($y = 0; $y < $this->height; $y++) { # each pixel
                     $rgbOrig = imagecolorat($image, $x, $y);
@@ -770,14 +768,23 @@ private function img2ocr(?string $output = null, int $amount = 80, int $threshol
                     $bBlur = ($rgbBlur & 0xFF);
 
                     $rNew = ($amount * ($rOrig - $rBlur)) + $rOrig;
-                        if ($rNew > 255) { $rNew = 255; }
-                        elseif ($rNew < 0) { $rNew = 0; }
+                    if ($rNew > 255) {
+                        $rNew = 255;
+                    } elseif ($rNew < 0) {
+                        $rNew = 0;
+                    }
                     $gNew = ($amount * ($gOrig - $gBlur)) + $gOrig;
-                        if ($gNew > 255) { $gNew = 255; }
-                        elseif ($gNew < 0) { $gNew = 0; }
+                    if ($gNew > 255) {
+                        $gNew = 255;
+                    } elseif ($gNew < 0) {
+                        $gNew = 0;
+                    }
                     $bNew = ($amount * ($bOrig - $bBlur)) + $bOrig;
-                        if ($bNew > 255) { $bNew = 255; }
-                        elseif ($bNew < 0) { $bNew = 0; }
+                    if ($bNew > 255) {
+                        $bNew = 255;
+                    } elseif ($bNew < 0) {
+                        $bNew = 0;
+                    }
                     $rgbNew = ($rNew << 16) + ($gNew << 8) + $bNew;
 
                     imagesetpixel($image, $x, $y, $rgbNew);
@@ -802,15 +809,11 @@ private function img2ocr(?string $output = null, int $amount = 80, int $threshol
                 $green = $this->round(0.59 * $colors['green']);
                 $blue = $this->round(0.11 * $colors['blue']);
 
-                # Create single-byte string from them 
+                # Create single-byte string from them
                 $pgm .= chr($red + $green + $blue);
             }
         }
 
-        if (empty($output)) {
-            $output = sprintf('%s/%s.pgm', F::dirname($file), F::name($file));
-        }
-
         F::write($output, $pgm);
     }
 
@@ -858,9 +861,9 @@ public function isOCRReadable(string $tmpDir = '.tmp'): bool
         # Iterate over available modes ..
         foreach ($modes as $mode) {
             # .. using (suggested) external library (if available), otherwise ..
-            if ($mode == 'tesseract' && class_exists('\thiagoalessio\TesseractOCR\TesseractOCR')) {
+            if ($mode == 'tesseract' && class_exists(TesseractOCR::class)) {
                 # Execute  `tesseract-ocr-for-php` & store its output
-                $tesseract = new \thiagoalessio\TesseractOCR\TesseractOCR($pgmFile);
+                $tesseract = new TesseractOCR($pgmFile);
                 $outputs[] = $tesseract->allowlist(range(0, 9), range('a', 'z'), range('A', 'Z'))->dpi(2200)->run();
             }
 
@@ -956,13 +959,9 @@ protected function gd2img(int $quality = 90, ?string $filename = null, string $t
 
         if ($type == 'gif') {
             imagegif($this->image, $filename);
-        }
-
-        elseif ($type == 'jpg') {
+        } elseif ($type == 'jpg') {
             imagejpeg($this->image, $filename, $quality);
-        }
-
-        elseif ($type == 'png') {
+        } elseif ($type == 'png') {
             # Normalize quality
             if ($quality > 9) {
                 $quality = -1;
@@ -1041,7 +1040,7 @@ public function inline(int $quality = 90, string $type = 'jpg'): string
 
     /**
      * Rounds float to integer
-     * 
+     *
      * @param float $number
      * @return int
      */
@@ -1053,7 +1052,7 @@ private function round(float $number): int
 
     /**
      * Creates random float between two digits
-     * 
+     *
      * @param float|int $min
      * @param float|int $max
      * @return float
diff --git a/src/BuilderAbstract.php b/src/BuilderAbstract.php
index d055d21..44752ef 100644
--- a/src/BuilderAbstract.php
+++ b/src/BuilderAbstract.php
@@ -1,10 +1,11 @@
 <?php
 
+declare(strict_types=1);
+
 namespace SimpleCaptcha;
 
 use SimpleCaptcha\Helpers\Str;
 
-
 /**
  * Class BuilderAbstract
  *
@@ -43,7 +44,7 @@ abstract class BuilderAbstract
      * @param int $height Captcha image height
      * @return self
      */
-    public abstract function build(int $width, int $height): self;
+    abstract public function build(int $width, int $height): self;
 
 
     /**
@@ -53,7 +54,7 @@ public abstract function build(int $width, int $height): self;
      * @param int $quality Captcha image quality
      * @return void
      */
-    public abstract function save(string $filename, int $quality = 90): void;
+    abstract public function save(string $filename, int $quality = 90): void;
 
 
     /**
@@ -63,7 +64,7 @@ public abstract function save(string $filename, int $quality = 90): void;
      * @param string $type Captcha image output format
      * @return void
      */
-    public abstract function output(int $quality = 90, string $type = 'jpg'): void;
+    abstract public function output(int $quality = 90, string $type = 'jpg'): void;
 
 
     /**
@@ -73,7 +74,7 @@ public abstract function output(int $quality = 90, string $type = 'jpg'): void;
      * @param string $type Captcha image output format
      * @return string
      */
-    public abstract function fetch(int $quality = 90, string $type = 'jpg'): string;
+    abstract public function fetch(int $quality = 90, string $type = 'jpg'): string;
 
 
     /**
@@ -83,7 +84,7 @@ public abstract function fetch(int $quality = 90, string $type = 'jpg'): string;
      * @param string $type Captcha image output format
      * @return string
      */
-    public abstract function inline(int $quality = 90, string $type = 'jpg'): string;
+    abstract public function inline(int $quality = 90, string $type = 'jpg'): string;
 
 
     /**
diff --git a/src/Toolkit.php b/src/Toolkit.php
index 11d41e1..22d5303 100644
--- a/src/Toolkit.php
+++ b/src/Toolkit.php
@@ -1,10 +1,11 @@
 <?php
 
+declare(strict_types=1);
+
 namespace SimpleCaptcha;
 
 use Exception;
 
-
 /**
  * Class Toolkit
  *
diff --git a/tests/BuilderTest.php b/tests/BuilderTest.php
index 753ca97..ba0d71f 100644
--- a/tests/BuilderTest.php
+++ b/tests/BuilderTest.php
@@ -11,7 +11,6 @@
 
 use Exception;
 
-
 /**
  * Class BuilderTest
  *
diff --git a/tests/ToolkitTest.php b/tests/ToolkitTest.php
index 2cd17ee..aeec81a 100644
--- a/tests/ToolkitTest.php
+++ b/tests/ToolkitTest.php
@@ -6,7 +6,6 @@
 
 use Exception;
 
-
 /**
  * Class BuilderTest
  *