diff --git a/composer.json b/composer.json
index d996f0d..3379f8e 100644
--- a/composer.json
+++ b/composer.json
@@ -8,15 +8,15 @@
         "cwp"
     ],
     "require": {
-        "php": ">=7.1.0",
-        "silverstripe/framework": "^4.7",
+        "php": "^7.3 || ^8.0",
+        "silverstripe/framework": "^4.10",
         "silverstripe/admin": "^1.7",
         "silverstripe/hybridsessions": "^2",
         "silverstripe/environmentcheck": "^2",
         "silverstripe/auditor": "^2"
     },
     "require-dev": {
-        "sminnee/phpunit": "^5.7",
+        "phpunit/phpunit": "^9.5",
         "squizlabs/php_codesniffer": "^3"
     },
     "autoload": {
diff --git a/tests/AtomFeedTest.php b/tests/AtomFeedTest.php
index 5795cbd..32755e0 100644
--- a/tests/AtomFeedTest.php
+++ b/tests/AtomFeedTest.php
@@ -32,17 +32,17 @@ public function testAtomFeed()
         $content = $atomFeed->outputToBrowser();
 
         //Debug::message($content);
-        $this->assertContains('<link href="http://www.example.org/item-a/" />', $content);
-        $this->assertContains('<link href="http://www.example.com/item-b.html" />', $content);
-        $this->assertContains('<link href="http://www.example.com/item-c.html" />', $content);
+        $this->assertStringContainsString('<link href="http://www.example.org/item-a/" />', $content);
+        $this->assertStringContainsString('<link href="http://www.example.com/item-b.html" />', $content);
+        $this->assertStringContainsString('<link href="http://www.example.com/item-c.html" />', $content);
 
-        $this->assertContains('<title type="html">ItemA</title>', $content);
-        $this->assertContains('<title type="html">ItemB</title>', $content);
-        $this->assertContains('<title type="html">ItemC</title>', $content);
+        $this->assertStringContainsString('<title type="html">ItemA</title>', $content);
+        $this->assertStringContainsString('<title type="html">ItemB</title>', $content);
+        $this->assertStringContainsString('<title type="html">ItemC</title>', $content);
 
-        $this->assertContains("\tItemA Content\n", $content);
-        $this->assertContains("\tItemB Content\n", $content);
-        $this->assertContains("\tItemC Content\n", $content);
+        $this->assertStringContainsString("\tItemA Content\n", $content);
+        $this->assertStringContainsString("\tItemB Content\n", $content);
+        $this->assertStringContainsString("\tItemC Content\n", $content);
     }
 
     public function testRenderWithTemplate()
@@ -50,18 +50,18 @@ public function testRenderWithTemplate()
         $atomFeed = new CwpAtomFeed(new ArrayList(), "", "", "");
         $content = $atomFeed->outputToBrowser();
         // test we have switched from a RSS feed test template tot he AtomFeed template
-        $this->assertNotContains('<title>Test Custom Template</title>', $content);
+        $this->assertStringNotContainsString('<title>Test Custom Template</title>', $content);
     }
 
     public function testLinkToFeed()
     {
         $link = AtomTagsStub::linkToFeed('atomLinkUrl', 'Atom feed of this blog');
-        $this->assertContains('atomLinkUrl', $link);
-        $this->assertContains('Atom feed of this blog', $link);
-        $this->assertContains('application/atom+xml', $link);
+        $this->assertStringContainsString('atomLinkUrl', $link);
+        $this->assertStringContainsString('Atom feed of this blog', $link);
+        $this->assertStringContainsString('application/atom+xml', $link);
     }
 
-    protected function setUp()
+    protected function setUp(): void
     {
         parent::setUp();
         Config::modify()->set(Director::class, 'alternate_base_url', '/');
@@ -71,7 +71,7 @@ protected function setUp()
         $_SERVER['HTTP_HOST'] = 'www.example.org';
     }
 
-    protected function tearDown()
+    protected function tearDown(): void
     {
         parent::tearDown();
         Config::modify()->set(Director::class, 'alternate_base_url', null);
diff --git a/tests/Control/CwpBasicAuthMiddlewareTest.php b/tests/Control/CwpBasicAuthMiddlewareTest.php
index aa30a16..31cdee3 100644
--- a/tests/Control/CwpBasicAuthMiddlewareTest.php
+++ b/tests/Control/CwpBasicAuthMiddlewareTest.php
@@ -23,7 +23,7 @@ class CwpBasicAuthMiddlewareTest extends SapphireTest
      */
     protected $originalServersVars = [];
 
-    protected function setUp()
+    protected function setUp(): void
     {
         parent::setUp();
 
@@ -33,7 +33,7 @@ protected function setUp()
         Config::modify()->set(BasicAuth::class, 'ignore_cli', false);
     }
 
-    protected function tearDown()
+    protected function tearDown(): void
     {
         $_SERVER = $this->originalServersVars;
 
diff --git a/tests/Control/InitialisationMiddlewareTest.php b/tests/Control/InitialisationMiddlewareTest.php
index cc11f4f..bc755f2 100644
--- a/tests/Control/InitialisationMiddlewareTest.php
+++ b/tests/Control/InitialisationMiddlewareTest.php
@@ -22,7 +22,7 @@ class InitialisationMiddlewareTest extends FunctionalTest
 
     protected $usesDatabase = true;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         parent::setUp();
 
diff --git a/tests/Extension/CWPVersionExtensionTest.php b/tests/Extension/CWPVersionExtensionTest.php
index 124ce36..8f9b25f 100644
--- a/tests/Extension/CWPVersionExtensionTest.php
+++ b/tests/Extension/CWPVersionExtensionTest.php
@@ -20,7 +20,7 @@ class CWPVersionExtensionTest extends SapphireTest
      */
     protected $leftAndMain;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         parent::setUp();
 
diff --git a/tests/PasswordEncryptor/PBKDF2Test.php b/tests/PasswordEncryptor/PBKDF2Test.php
index ac0b8fa..f491e42 100644
--- a/tests/PasswordEncryptor/PBKDF2Test.php
+++ b/tests/PasswordEncryptor/PBKDF2Test.php
@@ -26,12 +26,10 @@ public function testEncrypt()
         );
     }
 
-    /**
-     * @expectedException Exception
-     * @expectedExceptionMessage Hash algorithm "foobar" not found
-     */
     public function testThrowsExceptionWhenInvalidAlgorithmIsProvided()
     {
+        $this->expectException(\Exception::class);
+        $this->expectExceptionMessage('Hash algorithm "foobar" not found in hash_algos()');
         new PBKDF2('foobar');
     }
 }