diff --git a/extra/cache-extra/Tests/IntegrationTest.php b/extra/cache-extra/Tests/IntegrationTest.php
index ab72d6442..651c76784 100644
--- a/extra/cache-extra/Tests/IntegrationTest.php
+++ b/extra/cache-extra/Tests/IntegrationTest.php
@@ -19,14 +19,14 @@ use Twig\Test\IntegrationTestCase;
 
 class IntegrationTest extends IntegrationTestCase
 {
-    public function getExtensions()
+    public function getExtensions(): array
     {
         return [
             new CacheExtension(),
         ];
     }
 
-    protected function getRuntimeLoaders()
+    protected function getRuntimeLoaders(): array
     {
         return [
             new class implements RuntimeLoaderInterface {
diff --git a/extra/cssinliner-extra/Tests/IntegrationTest.php b/extra/cssinliner-extra/Tests/IntegrationTest.php
index 7004b5e99..f0acd6316 100644
--- a/extra/cssinliner-extra/Tests/IntegrationTest.php
+++ b/extra/cssinliner-extra/Tests/IntegrationTest.php
@@ -16,7 +16,7 @@ use Twig\Test\IntegrationTestCase;
 
 class IntegrationTest extends IntegrationTestCase
 {
-    public function getExtensions()
+    public function getExtensions(): array
     {
         return [
             new CssInlinerExtension(),
diff --git a/extra/html-extra/Tests/IntegrationTest.php b/extra/html-extra/Tests/IntegrationTest.php
index 8e2f94e38..d5cbb145d 100644
--- a/extra/html-extra/Tests/IntegrationTest.php
+++ b/extra/html-extra/Tests/IntegrationTest.php
@@ -16,7 +16,7 @@ use Twig\Test\IntegrationTestCase;
 
 class IntegrationTest extends IntegrationTestCase
 {
-    public function getExtensions()
+    public function getExtensions(): array
     {
         return [
             new HtmlExtension(),
diff --git a/extra/inky-extra/Tests/IntegrationTest.php b/extra/inky-extra/Tests/IntegrationTest.php
index d9420dd09..10180139d 100644
--- a/extra/inky-extra/Tests/IntegrationTest.php
+++ b/extra/inky-extra/Tests/IntegrationTest.php
@@ -16,7 +16,7 @@ use Twig\Test\IntegrationTestCase;
 
 class IntegrationTest extends IntegrationTestCase
 {
-    public function getExtensions()
+    public function getExtensions(): array
     {
         return [
             new InkyExtension(),
diff --git a/extra/intl-extra/Tests/IntegrationTest.php b/extra/intl-extra/Tests/IntegrationTest.php
index fa22b5708..d1f422f94 100644
--- a/extra/intl-extra/Tests/IntegrationTest.php
+++ b/extra/intl-extra/Tests/IntegrationTest.php
@@ -16,7 +16,7 @@ use Twig\Test\IntegrationTestCase;
 
 class IntegrationTest extends IntegrationTestCase
 {
-    public function getExtensions()
+    public function getExtensions(): array
     {
         return [
             new IntlExtension(),
diff --git a/extra/markdown-extra/Tests/IntegrationTest.php b/extra/markdown-extra/Tests/IntegrationTest.php
index 7db95c919..d1b04d273 100644
--- a/extra/markdown-extra/Tests/IntegrationTest.php
+++ b/extra/markdown-extra/Tests/IntegrationTest.php
@@ -16,7 +16,7 @@ use Twig\Test\IntegrationTestCase;
 
 class IntegrationTest extends IntegrationTestCase
 {
-    public function getExtensions()
+    public function getExtensions(): array
     {
         return [
             new MarkdownExtension(),
diff --git a/extra/string-extra/Tests/IntegrationTest.php b/extra/string-extra/Tests/IntegrationTest.php
index ddf6abfe5..1fda2fcbc 100644
--- a/extra/string-extra/Tests/IntegrationTest.php
+++ b/extra/string-extra/Tests/IntegrationTest.php
@@ -16,7 +16,7 @@ use Twig\Test\IntegrationTestCase;
 
 class IntegrationTest extends IntegrationTestCase
 {
-    public function getExtensions()
+    public function getExtensions(): array
     {
         return [
             new StringExtension(),