diff --git a/core/modules/media/tests/src/Unit/IFrameUrlHelperTest.php b/core/modules/media/tests/src/Unit/IFrameUrlHelperTest.php
index 99a1362b486fa7c9d7ab055f02cf25be350f8e50..1d2837958397da97f5daf6ebd93d5264e7b7ac9c 100644
--- a/core/modules/media/tests/src/Unit/IFrameUrlHelperTest.php
+++ b/core/modules/media/tests/src/Unit/IFrameUrlHelperTest.php
@@ -76,11 +76,14 @@ public function providerIsSecure() {
    * @dataProvider providerIsSecure
    */
   public function testIsSecure($url, $base_url, $secure) {
-    $request_context = $this->prophesize(RequestContext::class);
-    $request_context->getCompleteBaseUrl()->willReturn($base_url);
+    $request_context = $this->createMock(RequestContext::class);
+    $request_context->expects($this->any())
+      ->method('getCompleteBaseUrl')
+      ->willReturn($base_url);
+
     $url_helper = new IFrameUrlHelper(
-      $request_context->reveal(),
-      $this->prophesize(PrivateKey::class)->reveal()
+      $request_context,
+      $this->createMock(PrivateKey::class)
     );
 
     $this->assertSame($secure, $url_helper->isSecure($url));
diff --git a/core/tests/Drupal/Tests/Core/Routing/RouterTest.php b/core/tests/Drupal/Tests/Core/Routing/RouterTest.php
index d6ba1d43fb0a4970ec375c302a1921234ad91967..a9f150aa2a7945efbec5cf69051a2940ccf0a1e0 100644
--- a/core/tests/Drupal/Tests/Core/Routing/RouterTest.php
+++ b/core/tests/Drupal/Tests/Core/Routing/RouterTest.php
@@ -42,9 +42,11 @@ public function testMatchesWithDifferentFitOrder() {
     $current_path_stack = $this->prophesize(CurrentPathStack::class);
     $router = new Router($route_provider->reveal(), $current_path_stack->reveal(), $url_generator->reveal());
 
-    $request_context = $this->prophesize(RequestContext::class);
-    $request_context->getScheme()->willReturn('http');
-    $router->setContext($request_context->reveal());
+    $request_context = $this->createMock(RequestContext::class);
+    $request_context->expects($this->any())
+      ->method('getScheme')
+      ->willReturn('http');
+    $router->setContext($request_context);
 
     $current_path_stack->getPath(Argument::any())->willReturn('/user/1');
     $result = $router->match('/user/1');