diff --git a/src/di/MultiBinding/LazyProvider.php b/src/di/MultiBinding/LazyProvider.php
index 125b7847..3af84134 100644
--- a/src/di/MultiBinding/LazyProvider.php
+++ b/src/di/MultiBinding/LazyProvider.php
@@ -7,8 +7,6 @@
 use Ray\Di\InjectorInterface;
 use Ray\Di\ProviderInterface;
 
-use function assert;
-
 /**
  * @template T of ProviderInterface
  */
diff --git a/src/di/Name.php b/src/di/Name.php
index 9da92eae..335e76a7 100644
--- a/src/di/Name.php
+++ b/src/di/Name.php
@@ -12,7 +12,6 @@
 use ReflectionMethod;
 use ReflectionParameter;
 
-use function assert;
 use function class_exists;
 use function explode;
 use function get_class;
diff --git a/tests/di/ArgumentsTest.php b/tests/di/ArgumentsTest.php
index 7c0ea3a2..08f4b24c 100644
--- a/tests/di/ArgumentsTest.php
+++ b/tests/di/ArgumentsTest.php
@@ -8,8 +8,6 @@
 use ReflectionMethod;
 use ReflectionParameter;
 
-use function assert;
-use function is_object;
 use function spl_object_hash;
 
 class ArgumentsTest extends TestCase
diff --git a/tests/di/GrapherTest.php b/tests/di/GrapherTest.php
index 051a9520..214b750c 100644
--- a/tests/di/GrapherTest.php
+++ b/tests/di/GrapherTest.php
@@ -9,7 +9,6 @@
 
 use function assert;
 use function file_get_contents;
-use function is_object;
 use function is_string;
 use function passthru;
 use function property_exists;