diff --git a/src/Caching/Cache.php b/src/Caching/Cache.php
index 99e59569..b9ee6dba 100644
--- a/src/Caching/Cache.php
+++ b/src/Caching/Cache.php
@@ -95,7 +95,7 @@ final public function getStorage(): Storage
 	 */
 	final public function getNamespace(): string
 	{
-		return (string) substr($this->namespace, 0, -1);
+		return substr($this->namespace, 0, -1);
 	}
 
 
diff --git a/tests/Storages/FileStorage.deadlock.phpt b/tests/Storages/FileStorage.deadlock.phpt
index 8cae792c..78388958 100644
--- a/tests/Storages/FileStorage.deadlock.phpt
+++ b/tests/Storages/FileStorage.deadlock.phpt
@@ -24,6 +24,6 @@ try {
 } catch (Throwable $e) {
 }
 
-Assert::noError(function () use ($cache) {
-	$cache->load('key', function () {});
-});
+Assert::noError(
+	fn() => $cache->load('key', function () {}),
+);
diff --git a/tests/Storages/FileStorage.exceptions.phpt b/tests/Storages/FileStorage.exceptions.phpt
index f41e73de..e3d91059 100644
--- a/tests/Storages/FileStorage.exceptions.phpt
+++ b/tests/Storages/FileStorage.exceptions.phpt
@@ -14,9 +14,11 @@ use Tester\Assert;
 require __DIR__ . '/../bootstrap.php';
 
 
-Assert::exception(function () {
-	new FileStorage(getTempDir() . '/missing');
-}, Nette\DirectoryNotFoundException::class, "Directory '%a%' not found.");
+Assert::exception(
+	fn() => new FileStorage(getTempDir() . '/missing'),
+	Nette\DirectoryNotFoundException::class,
+	"Directory '%a%' not found.",
+);
 
 
 Assert::exception(function () {
diff --git a/tests/Storages/FileStorage.stress.phpt b/tests/Storages/FileStorage.stress.phpt
index 871e7d35..3daed319 100644
--- a/tests/Storages/FileStorage.stress.phpt
+++ b/tests/Storages/FileStorage.stress.phpt
@@ -20,13 +20,13 @@ set_time_limit(0);
 function randomStr()
 {
 	$s = str_repeat('LaTrine', rand(10, 2000));
-	return sha1($s, true) . $s;
+	return sha1($s, binary: true) . $s;
 }
 
 
 function checkStr($s)
 {
-	return substr($s, 0, 20) === sha1(substr($s, 20), true);
+	return substr($s, 0, 20) === sha1(substr($s, 20), binary: true);
 }