diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index bb85a67..0dff586 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -1,5 +1,8 @@
 name: Tests
 
+permissions:
+  contents: read
+
 on: [push, pull_request]
 
 jobs:
@@ -20,7 +23,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Set up PHP ${{ matrix.php }}
         uses: shivammathur/setup-php@v2
@@ -29,7 +32,7 @@ jobs:
           coverage: xdebug
 
       - name: Install dependencies with Composer
-        uses: ramsey/composer-install@v2
+        uses: ramsey/composer-install@v3
 
       - name: Coding standards
         if: matrix.analysis
@@ -44,8 +47,10 @@ jobs:
 
       - name: Upload coverage results to Coveralls
         if: matrix.analysis
-        env:
-          COVERALLS_REPO_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        run: |
-          composer require php-coveralls/php-coveralls -n -W
-          vendor/bin/php-coveralls --coverage_clover=clover.xml -v
+        uses: coverallsapp/github-action@v2
+        with:
+          file: clover.xml
+          flag-name: php-${{ matrix.php }}
+          # See: https://github.com/coverallsapp/github-action?tab=readme-ov-file#complete-parallel-job-example
+          parallel: false # Until now only one job is set for analysis
+          github-token: ${{ secrets.GITHUB_TOKEN }}
diff --git a/tests/ResponseTest.php b/tests/ResponseTest.php
index 7bd3206..7b73488 100644
--- a/tests/ResponseTest.php
+++ b/tests/ResponseTest.php
@@ -141,13 +141,8 @@ public function testReasonPhraseContainsLineFeed()
 
     public function testWithStatusValidReasonPhraseObject()
     {
-        $mock = $this->getMockBuilder(stdClass::class)->addMethods(['__toString'])->getMock();
-        $mock->expects($this->once())
-            ->method('__toString')
-            ->will($this->returnValue('Slim OK'));
-
         $response = new Response();
-        $response = $response->withStatus(200, $mock);
+        $response = $response->withStatus(200, new StringableTestObject('Slim OK'));
         $this->assertEquals('Slim OK', $response->getReasonPhrase());
     }
 
diff --git a/tests/StringableTestObject.php b/tests/StringableTestObject.php
new file mode 100644
index 0000000..36a6785
--- /dev/null
+++ b/tests/StringableTestObject.php
@@ -0,0 +1,23 @@
+<?php
+
+/**
+ * Slim Framework (https://slimframework.com)
+ *
+ * @license https://github.com/slimphp/Slim-Psr7/blob/master/LICENSE.md (MIT License)
+ */
+
+declare(strict_types=1);
+
+namespace Slim\Tests\Psr7;
+
+final class StringableTestObject implements \Stringable
+{
+    public function __construct(private string $value)
+    {
+    }
+
+    public function __toString(): string
+    {
+        return $this->value;
+    }
+}
diff --git a/tests/UploadedFileTest.php b/tests/UploadedFileTest.php
index ec90abc..fa13a0c 100644
--- a/tests/UploadedFileTest.php
+++ b/tests/UploadedFileTest.php
@@ -430,7 +430,7 @@ public function testCreateUploadedFileWithInvalidUri()
         new UploadedFile($stream);
     }
 
-    public function providerCreateFromGlobals(): array
+    public static function providerCreateFromGlobals(): array
     {
         return [
             // no nest: <input name="avatar" type="file">
diff --git a/tests/UriTest.php b/tests/UriTest.php
index 92077ec..aeb3a85 100644
--- a/tests/UriTest.php
+++ b/tests/UriTest.php
@@ -133,10 +133,7 @@ public function testWithHost()
 
     public function testWithHostValidObject()
     {
-        $mock = $this->getMockBuilder(stdClass::class)->addMethods(['__toString'])->getMock();
-        $mock->expects($this->once())
-            ->method('__toString')
-            ->will($this->returnValue('host.test'));
+        $mock = new StringableTestObject('host.test');
 
         $uri = $this->uriFactory()->withHost($mock);
         $this->assertEquals('host.test', $uri->getHost());
@@ -298,10 +295,7 @@ public function testWithQueryEmpty()
 
     public function testWithQueryValidObject()
     {
-        $mock = $this->getMockBuilder(stdClass::class)->addMethods(['__toString'])->getMock();
-        $mock->expects($this->once())
-            ->method('__toString')
-            ->will($this->returnValue('xyz=123'));
+        $mock = new StringableTestObject('xyz=123');
 
         $uri = $this->uriFactory()->withQuery($mock);
         $this->assertEquals('xyz=123', $uri->getQuery());
@@ -350,10 +344,7 @@ public function testWithFragmentEmpty()
 
     public function testWithFragmentValidObject()
     {
-        $mock = $this->getMockBuilder(stdClass::class)->addMethods(['__toString'])->getMock();
-        $mock->expects($this->once())
-            ->method('__toString')
-            ->will($this->returnValue('other-fragment'));
+        $mock = new StringableTestObject('other-fragment');
 
         $uri = $this->uriFactory()->withFragment($mock);
         $this->assertEquals('other-fragment', $uri->getFragment());