diff --git a/composer.json b/composer.json
index db4d73b..241d7ea 100644
--- a/composer.json
+++ b/composer.json
@@ -19,11 +19,12 @@
         "issues": "http://github.com/symbiote/silverstripe-gridfieldextensions/issues"
     },
     "require": {
+        "php": "^7.3 || ^8.0",
         "silverstripe/vendor-plugin": "^1.0",
-        "silverstripe/framework": "~4.0"
+        "silverstripe/framework": "^4.10"
     },
     "require-dev": {
-        "sminnee/phpunit": "^5.7",
+        "phpunit/phpunit": "^9.5",
         "squizlabs/php_codesniffer": "^3.0",
         "silverstripe/versioned": "^1"
     },
diff --git a/tests/GridFieldConfigurablePaginatorTest.php b/tests/GridFieldConfigurablePaginatorTest.php
index fdc7493..ae6a1de 100644
--- a/tests/GridFieldConfigurablePaginatorTest.php
+++ b/tests/GridFieldConfigurablePaginatorTest.php
@@ -16,7 +16,7 @@ class GridFieldConfigurablePaginatorTest extends SapphireTest
      */
     protected $gridField;
 
-    public function setUp()
+    protected function setUp(): void
     {
         parent::setUp();
 
@@ -172,12 +172,10 @@ class GridFieldConfigurablePaginatorTest extends SapphireTest
         ), $paginator->getPageSizesAsList());
     }
 
-    /**
-     * @expectedException Exception
-     * @expectedExceptionMessage No GridField available yet for this request!
-     */
     public function testGetGridFieldThrowsExceptionWhenNotSet()
     {
+        $this->expectException(\Exception::class);
+        $this->expectExceptionMessage('No GridField available yet for this request!');
         $paginator = new GridFieldConfigurablePaginator;
         $paginator->getGridField();
     }
diff --git a/tests/GridFieldEditableColumnsTest.php b/tests/GridFieldEditableColumnsTest.php
index 7cb6af3..fc9a9b9 100644
--- a/tests/GridFieldEditableColumnsTest.php
+++ b/tests/GridFieldEditableColumnsTest.php
@@ -48,7 +48,7 @@ class GridFieldEditableColumnsTest extends SapphireTest
         $column = $component->getColumnContent($grid, $record, 'Title');
 
         $this->assertInstanceOf(DBHTMLText::class, $column);
-        $this->assertRegExp(
+        $this->assertMatchesRegularExpression(
             '/<input type="text" name="TestGridField\[GridFieldEditableColumns\]\[100\]\[Title\]" value="foo"[^>]*>/',
             $column->getValue()
         );
@@ -64,7 +64,7 @@ class GridFieldEditableColumnsTest extends SapphireTest
         $column = $component->getColumnContent($grid, $record, 'Title');
 
         $this->assertInstanceOf(DBHTMLText::class, $column);
-        $this->assertRegExp(
+        $this->assertMatchesRegularExpression(
             '/<span[^>]*>\s*testval\s*<\/span>/',
             $column->getValue()
         );
@@ -86,7 +86,7 @@ class GridFieldEditableColumnsTest extends SapphireTest
         $column = $component->getColumnContent($grid, $record, 'Title');
 
         $this->assertInstanceOf(DBHTMLText::class, $column);
-        $this->assertRegExp(
+        $this->assertMatchesRegularExpression(
             '/<span[^>]*>\s*testval\s*<\/span>/',
             $column->getValue()
         );
diff --git a/tests/GridFieldOrderableRowsTest.php b/tests/GridFieldOrderableRowsTest.php
index e9ce1d4..44e9f1b 100644
--- a/tests/GridFieldOrderableRowsTest.php
+++ b/tests/GridFieldOrderableRowsTest.php
@@ -118,12 +118,12 @@ class GridFieldOrderableRowsTest extends SapphireTest
 
         $result = $orderable->getColumnContent($grid, $record, 'irrelevant');
 
-        $this->assertContains(
+        $this->assertStringContainsString(
             'Belongings[GridFieldEditableColumns][' . $record->ID . '][Sort]',
             $result,
             'The field name is indexed under the record\'s ID'
         );
-        $this->assertContains(
+        $this->assertStringContainsString(
             'value="' . $intermediary->Sort . '"',
             $result,
             'The value comes from the MMTL intermediary Sort value'
@@ -152,12 +152,12 @@ class GridFieldOrderableRowsTest extends SapphireTest
 
         $result = $orderable->getColumnContent($grid, $record, 'irrelevant');
 
-        $this->assertContains(
+        $this->assertStringContainsString(
             'Children[GridFieldEditableColumns][' . $record->ID . '][Sort]',
             $result,
             'The field name is indexed under the record\'s ID'
         );
-        $this->assertContains(
+        $this->assertStringContainsString(
             'value="' . $intermediary->Sort . '"',
             $result,
             'The value comes from the MMTL intermediary Sort value'
diff --git a/tests/OrderableRowsThroughVersionedTest.php b/tests/OrderableRowsThroughVersionedTest.php
index e7e3cb1..473e033 100644
--- a/tests/OrderableRowsThroughVersionedTest.php
+++ b/tests/OrderableRowsThroughVersionedTest.php
@@ -30,13 +30,13 @@ class OrderableRowsThroughVersionedTest extends SapphireTest
 
     protected $originalReadingMode;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         parent::setUp();
         $this->orignalReadingMode = Versioned::get_reading_mode();
     }
 
-    protected function tearDown()
+    protected function tearDown(): void
     {
         Versioned::set_reading_mode($this->originalReadingMode);
         unset($this->originalReadingMode);