diff --git a/composer.json b/composer.json
index ee798e6d..eb1b5f5c 100644
--- a/composer.json
+++ b/composer.json
@@ -22,7 +22,7 @@
     ],
     "require": {
         "php": "^8.3",
-        "phpunit/phpunit": "^9.5",
+        "phpunit/phpunit": "^11.3",
         "squizlabs/php_codesniffer": "^3.7",
         "behat/behat": "^3.11.0",
         "behat/mink": "^1.10.0",
diff --git a/tests/php/SilverStripeContextTest.php b/tests/php/SilverStripeContextTest.php
index 78058992..90fdae5a 100644
--- a/tests/php/SilverStripeContextTest.php
+++ b/tests/php/SilverStripeContextTest.php
@@ -40,7 +40,7 @@ public function testGetRegionObjFindsBySelector()
         $context->getSession()->getPage()
             ->expects($this->any())
             ->method('find')
-            ->will($this->returnValue($this->getElementMock()));
+            ->willReturn($this->getElementMock());
         $obj = $context->getRegionObj('.some-selector');
         $this->assertNotNull($obj);
     }
@@ -52,9 +52,9 @@ public function testGetRegionObjFindsByRegion()
         $context->getSession()->getPage()
             ->expects($this->any())
             ->method('find')
-            ->will($this->returnCallback(function ($type, $selector) use ($el) {
+            ->willReturnCallback(function ($type, $selector) use ($el) {
                 return ($selector == '.my-region') ? $el : null;
-            }));
+            });
         $context->setRegionMap(array('MyRegion' => '.my-asdf'));
         $obj = $context->getRegionObj('.my-region');
         $this->assertNotNull($obj);
@@ -67,18 +67,18 @@ protected function getContextMock()
     {
         $pageMock = $this->getMockBuilder(DocumentElement::class)
             ->disableOriginalConstructor()
-            ->setMethods(array('find'))
+            ->onlyMethods(array('find'))
             ->getMock();
         $sessionMock = $this->getMockBuilder(Session::class)
             ->setConstructorArgs(array(
                 $this->getMockBuilder(DriverInterface::class)->getMock(),
                 $this->getMockBuilder(SelectorsHandler::class)->getMock()
             ))
-            ->setMethods(array('getPage'))
+            ->onlyMethods(array('getPage'))
             ->getMock();
         $sessionMock->expects($this->any())
             ->method('getPage')
-            ->will($this->returnValue($pageMock));
+            ->willReturn($pageMock);
         $mink = new Mink(array('default' => $sessionMock));
         $mink->setDefaultSessionName('default');