diff --git a/tests/TestCase/Authenticator/CookieAuthenticatorTest.php b/tests/TestCase/Authenticator/CookieAuthenticatorTest.php
index a876888b..1c32bfb0 100644
--- a/tests/TestCase/Authenticator/CookieAuthenticatorTest.php
+++ b/tests/TestCase/Authenticator/CookieAuthenticatorTest.php
@@ -301,8 +301,12 @@ public function testPersistIdentity()
         $this->assertArrayHasKey('response', $result);
         $this->assertInstanceOf(RequestInterface::class, $result['request']);
         $this->assertInstanceOf(ResponseInterface::class, $result['response']);
+        $hashCost = '10';
+        if (PHP_VERSION_ID >= 80400) {
+            $hashCost = '12';
+        }
         $this->assertStringContainsString(
-            'CookieAuth=%5B%22mariano%22%2C%22%242y%2410%24', // `CookieAuth=["mariano","$2y$10$`
+            'CookieAuth=%5B%22mariano%22%2C%22%242y%24' . $hashCost . '%24', // `CookieAuth=["mariano","$2y$10$`
             $result['response']->getHeaderLine('Set-Cookie')
         );
         $this->assertStringContainsString(
diff --git a/tests/TestCase/PasswordHasher/LegacyPasswordHasherTest.php b/tests/TestCase/PasswordHasher/LegacyPasswordHasherTest.php
index 85225edd..b11b7796 100644
--- a/tests/TestCase/PasswordHasher/LegacyPasswordHasherTest.php
+++ b/tests/TestCase/PasswordHasher/LegacyPasswordHasherTest.php
@@ -47,7 +47,11 @@ public function testNeedsRehash()
         $hasher = new LegacyPasswordHasher();
         $this->assertTrue($hasher->needsRehash(md5('foo')));
         $this->assertTrue($hasher->needsRehash('bar'));
-        $this->assertFalse($hasher->needsRehash('$2y$10$juOA0XVFpvZa0KTxRxEYVuX5kIS7U1fKDRcxyYhhUQECN1oHYnBMy'));
+        $hashCost = '10';
+        if (PHP_VERSION_ID >= 80400) {
+            $hashCost = '12';
+        }
+        $this->assertFalse($hasher->needsRehash('$2y$' . $hashCost . '$juOA0XVFpvZa0KTxRxEYVuX5kIS7U1fKDRcxyYhhUQECN1oHYnBMy'));
     }
 
     /**