diff --git a/composer.json b/composer.json
index a2501247..94b29fdb 100644
--- a/composer.json
+++ b/composer.json
@@ -20,15 +20,15 @@
         }
     ],
     "require": {
+        "php": "^7.3 || ^8.0",
         "silverstripe/admin": "^1.6",
-        "silverstripe/framework": "^4.6",
+        "silverstripe/framework": "^4.10",
         "silverstripe/versioned": "^1.6",
         "silverstripe/graphql": "^3.5 || ^4",
         "silverstripe/vendor-plugin": "^1"
     },
     "require-dev": {
-        "sminnee/phpunit": "^5",
-        "sminnee/phpunit-mock-objects": "^3.4.5",
+        "phpunit/phpunit": "^9.5",
         "squizlabs/php_codesniffer": "^3",
         "silverstripe/cms": "^4.6"
     },
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index d9c630eb..82bd3199 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -1,8 +1,9 @@
 <phpunit bootstrap="vendor/silverstripe/cms/tests/bootstrap.php" colors="true">
-	<testsuite name="Default">
-		<directory>tests</directory>
-	</testsuite>
-
+	<testsuites>
+		<testsuite name="Default">
+			<directory>tests</directory>
+		</testsuite>
+	</testsuites>
 	<filter>
 		<whitelist addUncoveredFilesFromWhitelist="true">
 			<directory suffix=".php">src/</directory>
diff --git a/tests/ArchiveAdminTest.php b/tests/ArchiveAdminTest.php
index 650820fd..7fdacf1f 100644
--- a/tests/ArchiveAdminTest.php
+++ b/tests/ArchiveAdminTest.php
@@ -23,7 +23,7 @@ class ArchiveAdminTest extends SapphireTest
         ViewProviderVersionedObject::class,
     ];
 
-    protected function setUp()
+    protected function setUp(): void
     {
         parent::setUp();
     }
diff --git a/tests/Behat/Context/FeatureContext.php b/tests/Behat/Context/FeatureContext.php
index 1f8f8745..7425f03d 100644
--- a/tests/Behat/Context/FeatureContext.php
+++ b/tests/Behat/Context/FeatureContext.php
@@ -3,6 +3,7 @@
 namespace SilverStripe\VersionedAdmin\Tests\Behat\Context;
 
 use Behat\Mink\Element\NodeElement;
+use PHPUnit\Framework\Assert;
 use SilverStripe\BehatExtension\Context\SilverStripeContext;
 
 if (!class_exists(SilverStripeContext::class)) {
@@ -25,7 +26,7 @@ public function iShouldSeeAListOfVersions()
     public function iShouldSeeAListOfVersionsInDescendingOrder()
     {
         $versions = $this->getVersions();
-        assertNotEmpty($versions, 'I see a list of versions');
+        Assert::assertNotEmpty($versions, 'I see a list of versions');
 
         $previous = null;
 
@@ -43,7 +44,7 @@ public function iShouldSeeAListOfVersionsInDescendingOrder()
      */
     public function iClickOnTheFirstVersion()
     {
-        assertNotNull($this->getLatestVersion(), 'I should see a list of versions');
+        Assert::assertNotNull($this->getLatestVersion(), 'I should see a list of versions');
         $this->getLatestVersion()->click();
     }
 
@@ -61,7 +62,7 @@ public function iClickOnVersion($versionNo)
                 break;
             }
         }
-        assertNotNull($desiredVersion, 'Desired version ' . $versionNo . ' was not found in the page.');
+        Assert::assertNotNull($desiredVersion, 'Desired version ' . $versionNo . ' was not found in the page.');
         $this->clickVersion($desiredVersion);
     }
 
@@ -71,7 +72,7 @@ public function iClickOnVersion($versionNo)
     public function iOpenTheHistoryViewerActionsMenu()
     {
         $button = $this->getSession()->getPage()->find('css', '.history-viewer__heading .history-viewer__actions .btn');
-        assertNotNull($button, 'History viewer actions menu not found in the page.');
+        Assert::assertNotNull($button, 'History viewer actions menu not found in the page.');
 
         $button->click();
     }
@@ -85,7 +86,7 @@ public function theTextShouldBeDeleted($text)
             'xpath',
             sprintf('//del[contains(normalize-space(string(.)), \'%s\')]', $text)
         );
-        assertNotNull($result, $text . ' was not shown as deleted');
+        Assert::assertNotNull($result, $text . ' was not shown as deleted');
     }
 
     /**
@@ -97,7 +98,7 @@ public function theTextShouldBeAdded($text)
             'xpath',
             sprintf('//ins[contains(normalize-space(string(.)), \'%s\')]', $text)
         );
-        assertNotNull($result, $text . ' was not shown as added');
+        Assert::assertNotNull($result, $text . ' was not shown as added');
     }
 
     /**
@@ -158,7 +159,7 @@ public function iShouldSeeInTheAuthorColumn($text, $versionNumber)
         $authorColumn = $version->find('css', '.history-viewer__author');
 
         $exists = strpos($authorColumn->getText(), $text) !== false;
-        assertTrue($exists, 'Author column contains ' . $text);
+        Assert::assertTrue($exists, 'Author column contains ' . $text);
     }
 
     /**
@@ -172,7 +173,7 @@ public function iShouldSeeInTheRecordColumn($text, $versionNumber)
         $recordColumn = $version->find('css', '.history-viewer__version-state');
 
         $exists = strpos($recordColumn->getText(), $text) !== false;
-        assertTrue($exists, 'Record column contains ' . $text);
+        Assert::assertTrue($exists, 'Record column contains ' . $text);
     }
 
     /**
@@ -184,7 +185,7 @@ public function iShouldSeeInTheVersionColumn($text, $versionNumber)
         $versionColumn = $version->find('css', '.history-viewer__version-no');
 
         $exists = strpos($versionColumn->getText(), $text) !== false;
-        assertTrue($exists, 'Version column contains ' . $text);
+        Assert::assertTrue($exists, 'Version column contains ' . $text);
     }
 
     /**
diff --git a/tests/Controllers/HistoryViewerControllerTest.php b/tests/Controllers/HistoryViewerControllerTest.php
index 4edfe0c6..1de2234b 100644
--- a/tests/Controllers/HistoryViewerControllerTest.php
+++ b/tests/Controllers/HistoryViewerControllerTest.php
@@ -85,22 +85,18 @@ public function testSchema()
         $this->assertSame('application/json', $result->getHeader('Content-Type'));
     }
 
-    /**
-     * @expectedException InvalidArgumentException
-     * @expectedExceptionMessageRegExp /Missing required field/
-     */
     public function testGetVersionFormThrowsExceptionWhenArgsAreMissing()
     {
+        $this->expectException(\InvalidArgumentException::class);
+        $this->expectExceptionMessageMatches('/Missing required field/');
         $controller = new HistoryViewerController();
         $controller->getVersionForm([]);
     }
 
-    /**
-     * @expectedException InvalidArgumentException
-     * @expectedExceptionMessageRegExp /Missing required field/
-     */
     public function testGetVersionFormThrowsExceptionWhenArgsAreFalsy()
     {
+        $this->expectException(\InvalidArgumentException::class);
+        $this->expectExceptionMessageMatches('/Missing required field/');
         $controller = new HistoryViewerController();
         $controller->getVersionForm([
             'RecordClass' => 'Page',
@@ -109,12 +105,10 @@ public function testGetVersionFormThrowsExceptionWhenArgsAreFalsy()
         ]);
     }
 
-    /**
-     * @expectedException \SilverStripe\Control\HTTPResponse_Exception
-     * @expectedExceptionCode 404
-     */
     public function testGetVersionFormThrowsExceptionWhenRecordVersionDoesntExist()
     {
+        $this->expectException(\SilverStripe\Control\HTTPResponse_Exception::class);
+        $this->expectExceptionCode(404);
         $controller = new HistoryViewerController();
         $controller->getVersionForm([
             'RecordClass' => UnviewableVersionedObject::class,
@@ -123,13 +117,11 @@ public function testGetVersionFormThrowsExceptionWhenRecordVersionDoesntExist()
         ]);
     }
 
-    /**
-     * @expectedException \SilverStripe\Control\HTTPResponse_Exception
-     * @expectedExceptionCode 403
-     * @expectedExceptionMessage You don't have the necessary permissions to view Unviewable Versioned Object
-     */
     public function testGetVersionFormThrowsExceptionWhenCanViewIsFalse()
     {
+        $this->expectException(\SilverStripe\Control\HTTPResponse_Exception::class);
+        $this->expectExceptionCode(403);
+        $this->expectExceptionMessage("You don't have the necessary permissions to view Unviewable Versioned Object");
         $controller = new HistoryViewerController();
         $controller->getVersionForm([
             'RecordClass' => UnviewableVersionedObject::class,
@@ -151,32 +143,26 @@ public function testGetVersionFormReturnsForm()
         $this->assertInstanceOf(LeftAndMainFormRequestHandler::class, $result->getRequestHandler());
     }
 
-    /**
-     * @expectedException \SilverStripe\Control\HTTPResponse_Exception
-     * @expectedExceptionCode 400
-     */
     public function testVersionFormThrowsExceptionWithoutRequest()
     {
+        $this->expectException(\SilverStripe\Control\HTTPResponse_Exception::class);
+        $this->expectExceptionCode(400);
         $controller = new HistoryViewerController();
         $controller->versionForm(null);
     }
 
-    /**
-     * @expectedException \SilverStripe\Control\HTTPResponse_Exception
-     * @expectedExceptionCode 400
-     */
     public function testCompareFormThrowsExceptionWithoutRequest()
     {
+        $this->expectException(\SilverStripe\Control\HTTPResponse_Exception::class);
+        $this->expectExceptionMessage(400);
         $controller = new HistoryViewerController();
         $controller->compareForm(null);
     }
 
-    /**
-     * @expectedException InvalidArgumentException
-     * @expectedExceptionMessageRegExp /Missing required field/
-     */
     public function testVersionFormThrowsExceptionWhenArgsAreFalsy()
     {
+        $this->expectException(\InvalidArgumentException::class);
+        $this->expectExceptionMessageMatches('/Missing required field/');
         $controller = new HistoryViewerController();
         $controller->getVersionForm([
             'RecordClass' => 'Page',
diff --git a/tests/Forms/DataObjectVersionFormFactoryTest.php b/tests/Forms/DataObjectVersionFormFactoryTest.php
index 9dfc6696..0dd00ad3 100644
--- a/tests/Forms/DataObjectVersionFormFactoryTest.php
+++ b/tests/Forms/DataObjectVersionFormFactoryTest.php
@@ -29,7 +29,7 @@ class DataObjectVersionFormFactoryTest extends SapphireTest
      */
     protected $controller;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         parent::setUp();
 
@@ -56,12 +56,10 @@ public function testIsReadonlyFormType()
         );
     }
 
-    /**
-     * @expectedException InvalidArgumentException
-     * @expectedExceptionMessage Missing required context Record
-     */
     public function testGetFormThrowsExceptionOnMissingRequiredContext()
     {
+        $this->expectException(\InvalidArgumentException::class);
+        $this->expectExceptionMessage('Missing required context Record');
         $this->factory->getForm();
     }
 
diff --git a/tests/Forms/DiffFieldTest.php b/tests/Forms/DiffFieldTest.php
index 796d187c..08ed3183 100644
--- a/tests/Forms/DiffFieldTest.php
+++ b/tests/Forms/DiffFieldTest.php
@@ -19,7 +19,7 @@ public function testScalarValuesAreDiffed()
         $diffField->setComparisonField($newField);
         $diffField->setValue('old');
 
-        $this->assertRegExp('/^<ins>new<\/ins> *<del>old<\/del>$/', $diffField->Value());
+        $this->assertMatchesRegularExpression('/^<ins>new<\/ins> *<del>old<\/del>$/', $diffField->Value());
     }
 
     /**
diff --git a/tests/Forms/DiffTransformationTest.php b/tests/Forms/DiffTransformationTest.php
index 7741a72a..1158d849 100644
--- a/tests/Forms/DiffTransformationTest.php
+++ b/tests/Forms/DiffTransformationTest.php
@@ -27,7 +27,7 @@ class DiffTransformationTest extends SapphireTest
      */
     private $testForm;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         parent::setUp();
 
@@ -62,8 +62,8 @@ public function testTransform()
         $form->loadDataFrom($oldData);
 
         foreach ($form->Fields() as $index => $field) {
-            $this->assertContains($expected[$index]['before'], $field->Value(), 'Value before is shown');
-            $this->assertContains($expected[$index]['after'], $field->Value(), 'Value after is shown');
+            $this->assertStringContainsString($expected[$index]['before'], $field->Value(), 'Value before is shown');
+            $this->assertStringContainsString($expected[$index]['after'], $field->Value(), 'Value after is shown');
         }
     }
 
@@ -87,8 +87,8 @@ public function testTransformWithCompositeFields()
         $form->loadDataFrom($oldData);
 
         foreach (array_values($form->Fields()->dataFields()) as $index => $field) {
-            $this->assertContains($expected[$index]['before'], $field->Value(), 'Value before is shown');
-            $this->assertContains($expected[$index]['after'], $field->Value(), 'Value after is shown');
+            $this->assertStringContainsString($expected[$index]['before'], $field->Value(), 'Value before is shown');
+            $this->assertStringContainsString($expected[$index]['after'], $field->Value(), 'Value after is shown');
         }
     }