diff --git a/composer.json b/composer.json
index 00da9c2..4190b85 100755
--- a/composer.json
+++ b/composer.json
@@ -21,7 +21,7 @@
     },
     "require-dev": {
         "phpunit/phpunit": "^10.0 || ^11.0",
-        "phpstan/phpstan": "^2",
+        "phpstan/phpstan": "^2.1",
         "squizlabs/php_codesniffer": "^3.8",
         "slevomat/coding-standard": "~8.0"
     },
diff --git a/src/AbstractEntity.php b/src/AbstractEntity.php
index 605bf7d..6acd426 100644
--- a/src/AbstractEntity.php
+++ b/src/AbstractEntity.php
@@ -8,8 +8,9 @@
 use Intervention\Gif\Traits\CanDecode;
 use Intervention\Gif\Traits\CanEncode;
 use ReflectionClass;
+use Stringable;
 
-abstract class AbstractEntity
+abstract class AbstractEntity implements Stringable
 {
     use CanEncode;
     use CanDecode;
diff --git a/src/Blocks/Color.php b/src/Blocks/Color.php
index 368160b..7d473ae 100644
--- a/src/Blocks/Color.php
+++ b/src/Blocks/Color.php
@@ -27,7 +27,7 @@ public function __construct(
      *
      * @return int
      */
-    public function getRed()
+    public function getRed(): int
     {
         return $this->r;
     }
@@ -49,7 +49,7 @@ public function setRed(int $value): self
      *
      * @return int
      */
-    public function getGreen()
+    public function getGreen(): int
     {
         return $this->g;
     }
@@ -71,7 +71,7 @@ public function setGreen(int $value): self
      *
      * @return int
      */
-    public function getBlue()
+    public function getBlue(): int
     {
         return $this->b;
     }
diff --git a/src/Blocks/ColorTable.php b/src/Blocks/ColorTable.php
index e32a9b5..1a70f71 100644
--- a/src/Blocks/ColorTable.php
+++ b/src/Blocks/ColorTable.php
@@ -16,6 +16,7 @@ class ColorTable extends AbstractEntity
      */
     public function __construct(protected array $colors = [])
     {
+        //
     }
 
     /**
@@ -111,31 +112,16 @@ public function empty(): self
      */
     public function getLogicalSize(): int
     {
-        switch ($this->countColors()) {
-            case 4:
-                return 1;
-
-            case 8:
-                return 2;
-
-            case 16:
-                return 3;
-
-            case 32:
-                return 4;
-
-            case 64:
-                return 5;
-
-            case 128:
-                return 6;
-
-            case 256:
-                return 7;
-
-            default:
-                return 0;
-        }
+        return match ($this->countColors()) {
+            4 => 1,
+            8 => 2,
+            16 => 3,
+            32 => 4,
+            64 => 5,
+            128 => 6,
+            256 => 7,
+            default => 0,
+        };
     }
 
     /**
diff --git a/src/Blocks/CommentExtension.php b/src/Blocks/CommentExtension.php
index 74c3396..7c8a54e 100644
--- a/src/Blocks/CommentExtension.php
+++ b/src/Blocks/CommentExtension.php
@@ -20,9 +20,9 @@ class CommentExtension extends AbstractExtension
     /**
      * Get all or one comment
      *
-     * @return mixed
+     * @return array<string>
      */
-    public function getComments()
+    public function getComments(): array
     {
         return $this->comments;
     }
diff --git a/src/Blocks/FrameBlock.php b/src/Blocks/FrameBlock.php
index 176856c..b551669 100644
--- a/src/Blocks/FrameBlock.php
+++ b/src/Blocks/FrameBlock.php
@@ -37,49 +37,23 @@ public function __construct(
         protected ImageDescriptor $imageDescriptor = new ImageDescriptor(),
         protected ImageData $imageData = new ImageData()
     ) {
+        //
     }
 
     public function addEntity(AbstractEntity $entity): self
     {
-        switch (true) {
-            case $entity instanceof TableBasedImage:
-                $this->setTableBasedImage($entity);
-                break;
-
-            case $entity instanceof GraphicControlExtension:
-                $this->setGraphicControlExtension($entity);
-                break;
-
-            case $entity instanceof ImageDescriptor:
-                $this->setImageDescriptor($entity);
-                break;
-
-            case $entity instanceof ColorTable:
-                $this->setColorTable($entity);
-                break;
-
-            case $entity instanceof ImageData:
-                $this->setImageData($entity);
-                break;
-
-            case $entity instanceof PlainTextExtension:
-                $this->setPlainTextExtension($entity);
-                break;
-
-            case $entity instanceof NetscapeApplicationExtension:
-                $this->addApplicationExtension($entity);
-                break;
-
-            case $entity instanceof ApplicationExtension:
-                $this->addApplicationExtension($entity);
-                break;
-
-            case $entity instanceof CommentExtension:
-                $this->addCommentExtension($entity);
-                break;
-        }
-
-        return $this;
+        return match (true) {
+            $entity instanceof TableBasedImage => $this->setTableBasedImage($entity),
+            $entity instanceof GraphicControlExtension => $this->setGraphicControlExtension($entity),
+            $entity instanceof ImageDescriptor => $this->setImageDescriptor($entity),
+            $entity instanceof ColorTable => $this->setColorTable($entity),
+            $entity instanceof ImageData => $this->setImageData($entity),
+            $entity instanceof PlainTextExtension => $this->setPlainTextExtension($entity),
+            $entity instanceof NetscapeApplicationExtension,
+            $entity instanceof ApplicationExtension => $this->addApplicationExtension($entity),
+            $entity instanceof CommentExtension => $this->addCommentExtension($entity),
+            default => $this,
+        };
     }
 
     /**
@@ -259,9 +233,10 @@ public function addCommentExtension(CommentExtension $extension): self
      */
     public function getNetscapeExtension(): ?NetscapeApplicationExtension
     {
-        $extensions = array_filter($this->applicationExtensions, function ($extension) {
-            return $extension instanceof NetscapeApplicationExtension;
-        });
+        $extensions = array_filter(
+            $this->applicationExtensions,
+            fn(ApplicationExtension $extension): bool => $extension instanceof NetscapeApplicationExtension,
+        );
 
         return count($extensions) ? reset($extensions) : null;
     }
diff --git a/src/Blocks/ImageDescriptor.php b/src/Blocks/ImageDescriptor.php
index 22482ca..29e2f65 100644
--- a/src/Blocks/ImageDescriptor.php
+++ b/src/Blocks/ImageDescriptor.php
@@ -141,7 +141,7 @@ public function setPosition(int $left, int $top): self
      */
     public function isInterlaced(): bool
     {
-        return $this->interlaced === true;
+        return $this->interlaced;
     }
 
     /**
@@ -182,7 +182,7 @@ public function hasLocalColorTable(): bool
      * @param bool $existance
      * @return self
      */
-    public function setLocalColorTableExistance($existance = true): self
+    public function setLocalColorTableExistance(bool $existance = true): self
     {
         $this->localColorTableExistance = $existance;
 
@@ -205,7 +205,7 @@ public function getLocalColorTableSorted(): bool
      * @param bool $sorted
      * @return self
      */
-    public function setLocalColorTableSorted($sorted = true): self
+    public function setLocalColorTableSorted(bool $sorted = true): self
     {
         $this->localColorTableSorted = $sorted;
 
diff --git a/src/Blocks/LogicalScreenDescriptor.php b/src/Blocks/LogicalScreenDescriptor.php
index f107e87..821f1b2 100644
--- a/src/Blocks/LogicalScreenDescriptor.php
+++ b/src/Blocks/LogicalScreenDescriptor.php
@@ -124,7 +124,7 @@ public function hasGlobalColorTable(): bool
      * @param bool $existance
      * @return self
      */
-    public function setGlobalColorTableExistance($existance = true): self
+    public function setGlobalColorTableExistance(bool $existance = true): self
     {
         $this->globalColorTableExistance = $existance;
 
@@ -147,7 +147,7 @@ public function getGlobalColorTableSorted(): bool
      * @param bool $sorted
      * @return self
      */
-    public function setGlobalColorTableSorted($sorted = true): self
+    public function setGlobalColorTableSorted(bool $sorted = true): self
     {
         $this->globalColorTableSorted = $sorted;
 
@@ -235,7 +235,7 @@ public function setPixelAspectRatio(int $ratio): self
      *
      * @return int
      */
-    public function getBitsPerPixel()
+    public function getBitsPerPixel(): int
     {
         return $this->bitsPerPixel;
     }
diff --git a/src/Blocks/PlainTextExtension.php b/src/Blocks/PlainTextExtension.php
index c6f1995..6b102f9 100644
--- a/src/Blocks/PlainTextExtension.php
+++ b/src/Blocks/PlainTextExtension.php
@@ -58,6 +58,6 @@ public function setText(array $text): self
      */
     public function hasText(): bool
     {
-        return count($this->text) > 0;
+        return $this->text !== [];
     }
 }
diff --git a/src/Builder.php b/src/Builder.php
index 91a9c26..8654951 100644
--- a/src/Builder.php
+++ b/src/Builder.php
@@ -73,7 +73,7 @@ public static function canvas(int $width, int $height): self
      */
     public function setLoops(int $loops): self
     {
-        if (count($this->gif->getFrames()) === 0) {
+        if ($this->gif->getFrames() === []) {
             throw new Exception('Add at least one frame before setting the loop count');
         }
 
diff --git a/src/Decoders/GifDataStreamDecoder.php b/src/Decoders/GifDataStreamDecoder.php
index 41b2f86..634a0a9 100644
--- a/src/Decoders/GifDataStreamDecoder.php
+++ b/src/Decoders/GifDataStreamDecoder.php
@@ -41,7 +41,7 @@ public function decode(): GifDataStream
             );
         }
 
-        while ($this->viewNextByte() != Trailer::MARKER) {
+        while ($this->viewNextByte() !== Trailer::MARKER) {
             match ($this->viewNextBytes(2)) {
                 // trailing "global" comment blocks which are not part of "FrameBlock"
                 AbstractExtension::MARKER . CommentExtension::LABEL
diff --git a/src/Encoders/ApplicationExtensionEncoder.php b/src/Encoders/ApplicationExtensionEncoder.php
index 0992334..142ce3c 100644
--- a/src/Encoders/ApplicationExtensionEncoder.php
+++ b/src/Encoders/ApplicationExtensionEncoder.php
@@ -5,6 +5,8 @@
 namespace Intervention\Gif\Encoders;
 
 use Intervention\Gif\Blocks\ApplicationExtension;
+use Intervention\Gif\Blocks\DataSubBlock;
+use Intervention\Gif\Exceptions\EncoderException;
 
 class ApplicationExtensionEncoder extends AbstractEncoder
 {
@@ -21,6 +23,7 @@ public function __construct(ApplicationExtension $source)
     /**
      * Encode current source
      *
+     * @throws EncoderException
      * @return string
      */
     public function encode(): string
@@ -30,9 +33,7 @@ public function encode(): string
             ApplicationExtension::LABEL,
             pack('C', $this->source->getBlockSize()),
             $this->source->getApplication(),
-            implode('', array_map(function ($block) {
-                return $block->encode();
-            }, $this->source->getBlocks())),
+            implode('', array_map(fn(DataSubBlock $block): string => $block->encode(), $this->source->getBlocks())),
             ApplicationExtension::TERMINATOR,
         ]);
     }
diff --git a/src/Encoders/ColorTableEncoder.php b/src/Encoders/ColorTableEncoder.php
index a3c4bff..a54dcd1 100644
--- a/src/Encoders/ColorTableEncoder.php
+++ b/src/Encoders/ColorTableEncoder.php
@@ -4,7 +4,9 @@
 
 namespace Intervention\Gif\Encoders;
 
+use Intervention\Gif\Blocks\Color;
 use Intervention\Gif\Blocks\ColorTable;
+use Intervention\Gif\Exceptions\EncoderException;
 
 class ColorTableEncoder extends AbstractEncoder
 {
@@ -21,12 +23,14 @@ public function __construct(ColorTable $source)
     /**
      * Encode current source
      *
+     * @throws EncoderException
      * @return string
      */
     public function encode(): string
     {
-        return implode('', array_map(function ($color) {
-            return $color->encode();
-        }, $this->source->getColors()));
+        return implode('', array_map(
+            fn(Color $color): string => $color->encode(),
+            $this->source->getColors(),
+        ));
     }
 }
diff --git a/src/Encoders/CommentExtensionEncoder.php b/src/Encoders/CommentExtensionEncoder.php
index 4cbea5a..0bd5631 100644
--- a/src/Encoders/CommentExtensionEncoder.php
+++ b/src/Encoders/CommentExtensionEncoder.php
@@ -40,7 +40,7 @@ public function encode(): string
      */
     protected function encodeComments(): string
     {
-        return implode('', array_map(function ($comment) {
+        return implode('', array_map(function (string $comment): string {
             return pack('C', strlen($comment)) . $comment;
         }, $this->source->getComments()));
     }
diff --git a/src/Encoders/FrameBlockEncoder.php b/src/Encoders/FrameBlockEncoder.php
index ef244a1..b74f1c3 100644
--- a/src/Encoders/FrameBlockEncoder.php
+++ b/src/Encoders/FrameBlockEncoder.php
@@ -4,7 +4,10 @@
 
 namespace Intervention\Gif\Encoders;
 
+use Intervention\Gif\Blocks\ApplicationExtension;
+use Intervention\Gif\Blocks\CommentExtension;
 use Intervention\Gif\Blocks\FrameBlock;
+use Intervention\Gif\Exceptions\EncoderException;
 
 class FrameBlockEncoder extends AbstractEncoder
 {
@@ -18,6 +21,9 @@ public function __construct(FrameBlock $source)
         $this->source = $source;
     }
 
+    /**
+     * @throws EncoderException
+     */
     public function encode(): string
     {
         $graphicControlExtension = $this->source->getGraphicControlExtension();
@@ -25,12 +31,14 @@ public function encode(): string
         $plainTextExtension = $this->source->getPlainTextExtension();
 
         return implode('', [
-            implode('', array_map(function ($extension) {
-                return $extension->encode();
-            }, $this->source->getApplicationExtensions())),
-            implode('', array_map(function ($extension) {
-                return $extension->encode();
-            }, $this->source->getCommentExtensions())),
+            implode('', array_map(
+                fn(ApplicationExtension $extension): string => $extension->encode(),
+                $this->source->getApplicationExtensions(),
+            )),
+            implode('', array_map(
+                fn(CommentExtension $extension): string => $extension->encode(),
+                $this->source->getCommentExtensions(),
+            )),
             $plainTextExtension ? $plainTextExtension->encode() : '',
             $graphicControlExtension ? $graphicControlExtension->encode() : '',
             $this->source->getImageDescriptor()->encode(),
diff --git a/src/Encoders/GifDataStreamEncoder.php b/src/Encoders/GifDataStreamEncoder.php
index 16098f1..4e69138 100644
--- a/src/Encoders/GifDataStreamEncoder.php
+++ b/src/Encoders/GifDataStreamEncoder.php
@@ -4,6 +4,9 @@
 
 namespace Intervention\Gif\Encoders;
 
+use Intervention\Gif\Blocks\CommentExtension;
+use Intervention\Gif\Blocks\FrameBlock;
+use Intervention\Gif\Exceptions\EncoderException;
 use Intervention\Gif\GifDataStream;
 
 class GifDataStreamEncoder extends AbstractEncoder
@@ -21,6 +24,7 @@ public function __construct(GifDataStream $source)
     /**
      * Encode current source
      *
+     * @throws EncoderException
      * @return string
      */
     public function encode(): string
@@ -47,24 +51,28 @@ protected function maybeEncodeGlobalColorTable(): string
     /**
      * Encode data blocks of source
      *
+     * @throws EncoderException
      * @return string
      */
     protected function encodeFrames(): string
     {
-        return implode('', array_map(function ($frame) {
-            return $frame->encode();
-        }, $this->source->getFrames()));
+        return implode('', array_map(
+            fn(FrameBlock $frame): string => $frame->encode(),
+            $this->source->getFrames(),
+        ));
     }
 
     /**
      * Encode comment extension blocks of source
      *
+     * @throws EncoderException
      * @return string
      */
     protected function encodeComments(): string
     {
-        return implode('', array_map(function ($commentExtension) {
-            return $commentExtension->encode();
-        }, $this->source->getComments()));
+        return implode('', array_map(
+            fn(CommentExtension $commentExtension): string => $commentExtension->encode(),
+            $this->source->getComments()
+        ));
     }
 }
diff --git a/src/Encoders/ImageDataEncoder.php b/src/Encoders/ImageDataEncoder.php
index 8a564d4..f601911 100644
--- a/src/Encoders/ImageDataEncoder.php
+++ b/src/Encoders/ImageDataEncoder.php
@@ -5,6 +5,7 @@
 namespace Intervention\Gif\Encoders;
 
 use Intervention\Gif\AbstractEntity;
+use Intervention\Gif\Blocks\DataSubBlock;
 use Intervention\Gif\Exceptions\EncoderException;
 use Intervention\Gif\Blocks\ImageData;
 
@@ -34,9 +35,10 @@ public function encode(): string
 
         return implode('', [
             pack('C', $this->source->getLzwMinCodeSize()),
-            implode('', array_map(function ($block) {
-                return $block->encode();
-            }, $this->source->getBlocks())),
+            implode('', array_map(
+                fn(DataSubBlock $block): string => $block->encode(),
+                $this->source->getBlocks(),
+            )),
             AbstractEntity::TERMINATOR,
         ]);
     }
diff --git a/src/Encoders/NetscapeApplicationExtensionEncoder.php b/src/Encoders/NetscapeApplicationExtensionEncoder.php
index dae1607..a280e18 100644
--- a/src/Encoders/NetscapeApplicationExtensionEncoder.php
+++ b/src/Encoders/NetscapeApplicationExtensionEncoder.php
@@ -5,6 +5,7 @@
 namespace Intervention\Gif\Encoders;
 
 use Intervention\Gif\Blocks\ApplicationExtension;
+use Intervention\Gif\Blocks\DataSubBlock;
 use Intervention\Gif\Blocks\NetscapeApplicationExtension;
 
 class NetscapeApplicationExtensionEncoder extends ApplicationExtensionEncoder
@@ -31,9 +32,7 @@ public function encode(): string
             ApplicationExtension::LABEL,
             pack('C', $this->source->getBlockSize()),
             $this->source->getApplication(),
-            implode('', array_map(function ($block) {
-                return $block->encode();
-            }, $this->source->getBlocks())),
+            implode('', array_map(fn(DataSubBlock $block): string => $block->encode(), $this->source->getBlocks())),
             ApplicationExtension::TERMINATOR,
         ]);
     }
diff --git a/src/Encoders/PlainTextExtensionEncoder.php b/src/Encoders/PlainTextExtensionEncoder.php
index 54d448a..9ddd6fb 100644
--- a/src/Encoders/PlainTextExtensionEncoder.php
+++ b/src/Encoders/PlainTextExtensionEncoder.php
@@ -55,8 +55,9 @@ protected function encodeHead(): string
      */
     protected function encodeTexts(): string
     {
-        return implode('', array_map(function ($text) {
-            return pack('C', strlen($text)) . $text;
-        }, $this->source->getText()));
+        return implode('', array_map(
+            fn(string $text): string => pack('C', strlen($text)) . $text,
+            $this->source->getText(),
+        ));
     }
 }
diff --git a/src/Splitter.php b/src/Splitter.php
index 3c25e97..6377093 100644
--- a/src/Splitter.php
+++ b/src/Splitter.php
@@ -36,6 +36,7 @@ class Splitter implements IteratorAggregate
      */
     public function __construct(protected GifDataStream $stream)
     {
+        //
     }
 
     /**
@@ -157,12 +158,10 @@ public function toResources(): array
         $resources = [];
 
         foreach ($this->frames as $frame) {
-            if (is_a($frame, GifDataStream::class)) {
-                $resource = imagecreatefromstring($frame->encode());
-                imagepalettetotruecolor($resource);
-                imagesavealpha($resource, true);
-                $resources[] = $resource;
-            }
+            $resource = imagecreatefromstring($frame->encode());
+            imagepalettetotruecolor($resource);
+            imagesavealpha($resource, true);
+            $resources[] = $resource;
         }
 
         return $resources;
diff --git a/src/Traits/CanHandleFiles.php b/src/Traits/CanHandleFiles.php
index 53385eb..21ce0c8 100644
--- a/src/Traits/CanHandleFiles.php
+++ b/src/Traits/CanHandleFiles.php
@@ -25,7 +25,7 @@ private static function isFilePath(mixed $input): bool
      */
     private static function hasNullBytes(string $string): bool
     {
-        return strpos($string, chr(0)) !== false;
+        return str_contains($string, chr(0));
     }
 
     /**