diff --git a/src/Mirror/Model/GZipTrait.php b/src/Mirror/Model/GZipTrait.php
index 99b68105..fee4979d 100644
--- a/src/Mirror/Model/GZipTrait.php
+++ b/src/Mirror/Model/GZipTrait.php
@@ -59,7 +59,7 @@ protected function decode(string $gzip): string
      */
     protected function isGzip(string $gzip): bool
     {
-        if (\mb_strpos($gzip, "\x1f"."\x8b"."\x08") === 0) {
+        if (str_starts_with($gzip, "\x1f" . "\x8b" . "\x08")) {
             return true;
         }
 
diff --git a/src/Twig/PackagistExtension.php b/src/Twig/PackagistExtension.php
index 52ff5d65..4cdceb81 100644
--- a/src/Twig/PackagistExtension.php
+++ b/src/Twig/PackagistExtension.php
@@ -174,7 +174,7 @@ public function truncate($string, $length)
             return "";
         }
 
-        return mb_strlen($string) > $length ? mb_substr($string, 0, $length) . '...' : $string;
+        return strlen($string) > $length ? substr($string, 0, $length) . '...' : $string;
     }
 
     public function numericTest($val)
diff --git a/src/Webhook/HmacOpensslCrypter.php b/src/Webhook/HmacOpensslCrypter.php
index da21b64f..c7ce1444 100644
--- a/src/Webhook/HmacOpensslCrypter.php
+++ b/src/Webhook/HmacOpensslCrypter.php
@@ -52,7 +52,7 @@ public function encryptData(string $data): ?string
     private function removeHmac(string $data): array
     {
         $data = base64_decode($data);
-        $hashLength = mb_strlen(hash($this->hmacAlgo, $data, true), '8bit');
+        $hashLength = strlen(hash($this->hmacAlgo, $data, true));
 
         $hmac = substr($data, 0, $hashLength);
         $data = substr($data, $hashLength);
diff --git a/src/Webhook/HookRequestExecutor.php b/src/Webhook/HookRequestExecutor.php
index 82038b27..ad27b66d 100644
--- a/src/Webhook/HookRequestExecutor.php
+++ b/src/Webhook/HookRequestExecutor.php
@@ -142,7 +142,7 @@ private function hideSensitiveRequest(HookRequest $request, mixed $secrets = nul
         $opts = $this->hideSensitiveParameters(null, $request->jsonSerialize(), $secrets)[1];
         if (is_array($headers = $opts['options']['headers'] ?? null)) {
             foreach ($headers as $name => $value) {
-                if (str_contains(mb_strtolower($name), 'authorization')) {
+                if (str_contains(strtolower($name), 'authorization')) {
                     $headers[$name] = '***';
                 }
             }