diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 0255c77..6ff41af 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -12,6 +12,10 @@ jobs:
       fail-fast: false
       matrix:
         php:
+          - "7.2"
+          - "7.3"
+          - "7.4"
+          - "8.0"
           - "8.1"
           - "8.2"
           - "8.3"
diff --git a/composer.json b/composer.json
index 7e3923f..15ff22b 100644
--- a/composer.json
+++ b/composer.json
@@ -23,7 +23,7 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-master": "3.4.x-dev"
+            "dev-master": "3.x-dev"
         }
     }
 }
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index 5c8d487..ab6b545 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/4.1/phpunit.xsd"
+         xsi:noNamespaceSchemaLocation="vendor/phpunit/phpunit/phpunit.xsd"
          backupGlobals="false"
          colors="true"
          bootstrap="vendor/autoload.php"
diff --git a/src/Pimple/Tests/PimpleTest.php b/src/Pimple/Tests/PimpleTest.php
index d88ca6d..52e218f 100644
--- a/src/Pimple/Tests/PimpleTest.php
+++ b/src/Pimple/Tests/PimpleTest.php
@@ -29,6 +29,7 @@
 use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
 use Pimple\Container;
+use Pimple\ServiceProviderInterface;
 
 /**
  * @author Igor Wiedler <igor@wiedler.ch>
@@ -204,7 +205,14 @@ public function testRawHonorsNullValues()
     public function testFluentRegister()
     {
         $pimple = new Container();
-        $this->assertSame($pimple, $pimple->register($this->getMockBuilder('Pimple\ServiceProviderInterface')->getMock()));
+
+        $stub = new class implements ServiceProviderInterface {
+            public function register(Container $pimple)
+            {
+            }
+        };
+
+        $this->assertSame($pimple, $pimple->register($stub));
     }
 
     public function testRawValidatesKeyIsPresent()
@@ -275,13 +283,13 @@ public function testExtendDoesNotLeakWithFactories()
         unset($pimple['foo']);
 
         $p = new \ReflectionProperty($pimple, 'values');
-        if (PHP_VERSION < 80100) {
+        if (PHP_VERSION_ID < 80100) {
             $p->setAccessible(true);
         }
         $this->assertEmpty($p->getValue($pimple));
 
         $p = new \ReflectionProperty($pimple, 'factories');
-        if (PHP_VERSION < 80100) {
+        if (PHP_VERSION_ID < 80100) {
             $p->setAccessible(true);
         }
         $this->assertCount(0, $p->getValue($pimple));
@@ -425,6 +433,7 @@ public function testLegacyExtendFailsForKeysNotContainingServiceDefinitions($ser
     /**
      * @group legacy
      * @expectedDeprecation How Pimple behaves when extending protected closures will be fixed in Pimple 4. Are you sure "foo" should be protected?
+     * @dataProvider badServiceDefinitionProvider
      */
     #[DataProvider('badServiceDefinitionProvider')]
     public function testExtendingProtectedClosureDeprecation($service)