diff --git a/tests/codeception/tests/integration/AjaxHandlerTest.php b/tests/codeception/tests/integration/AjaxHandlerTest.php
index ec8af8833c5f646fa13be01267b927446cdb1f5e..f89bc8b5f09304a8183e83e40288b8d7238a4218 100644
--- a/tests/codeception/tests/integration/AjaxHandlerTest.php
+++ b/tests/codeception/tests/integration/AjaxHandlerTest.php
@@ -12,13 +12,13 @@ class AjaxHandlerTest extends WPTestCase {
 	const NOTICE_NAME = 'test_notice_name';
 	const WP_DEFAULT_PRIORITY = 10;
 
-    public function setUp() {
+    public function setUp(): void {
         parent::setUp();
         add_filter( 'wp_doing_ajax', '__return_true' );
         add_filter( 'wp_die_ajax_handler', array( $this, 'getDieHandler' ), 1, 1 );
     }
 
-    public function tearDown() {
+    public function tearDown(): void {
         parent::tearDown();
     }
 
diff --git a/tests/codeception/tests/integration/FunctionsTest.php b/tests/codeception/tests/integration/FunctionsTest.php
index 05117cb1a1dd30d263f0e2cb7c4edd8a7cc8968c..12012af8166acc7ac8a06c2103bfc7078acb45fe 100644
--- a/tests/codeception/tests/integration/FunctionsTest.php
+++ b/tests/codeception/tests/integration/FunctionsTest.php
@@ -11,11 +11,11 @@ use \WPDesk\Notice\PermanentDismissibleNotice;
  */
 class FunctionsTest extends WPTestCase {
 
-    public function setUp() {
+    public function setUp():void {
         parent::setUp();
     }
 
-    public function tearDown() {
+    public function tearDown():void {
         parent::tearDown();
     }
 
diff --git a/tests/codeception/tests/integration/NoticeTest.php b/tests/codeception/tests/integration/NoticeTest.php
index feb1c1e7de7407750be54ba6bd3d6c33c3a058f1..89ebd70a6a26577e59224d40f838f8ee35d22bca 100644
--- a/tests/codeception/tests/integration/NoticeTest.php
+++ b/tests/codeception/tests/integration/NoticeTest.php
@@ -7,11 +7,11 @@ use \WPDesk\Notice\Notice;
 
 class NoticeTest extends WPTestCase {
 
-    public function setUp() {
+    public function setUp():void {
         parent::setUp();
     }
 
-    public function tearDown() {
+    public function tearDown():void {
         parent::tearDown();
     }
 
diff --git a/tests/codeception/tests/integration/PermanentDismissinleNoticeTest.php b/tests/codeception/tests/integration/PermanentDismissinleNoticeTest.php
index ec59a580fb96eed3994e1d115342cd966a24f37e..25d18fa85d5e6f06c6260091c3eb5e3fa3bc7d2b 100644
--- a/tests/codeception/tests/integration/PermanentDismissinleNoticeTest.php
+++ b/tests/codeception/tests/integration/PermanentDismissinleNoticeTest.php
@@ -9,11 +9,11 @@ class PermanentDismissinleNoticeTest extends WPTestCase {
 
 	const NOTICE_NAME = 'test_notice_name';
 
-    public function setUp() {
+    public function setUp():void {
         parent::setUp();
     }
 
-    public function tearDown() {
+    public function tearDown():void {
         parent::tearDown();
     }