diff --git a/src/Webhooks/IncomingWebhook.php b/src/Webhooks/IncomingWebhook.php
index 93b7893..ebdd012 100644
--- a/src/Webhooks/IncomingWebhook.php
+++ b/src/Webhooks/IncomingWebhook.php
@@ -78,7 +78,7 @@ protected function validateSignature(): void
         $signature = $this->generateSignature();
         $header = $this->findHeader(self::SIGNATURE_HEADERS);
 
-        if ($signature !== $header) {
+        if (hash_equals($signature, $header) === false) {
             throw new InvalidSignatureException($signature, $header);
         }
     }