diff --git a/composer.json b/composer.json
index e157113..fda8381 100644
--- a/composer.json
+++ b/composer.json
@@ -20,7 +20,7 @@
         }
     },
     "require": {
-        "php": ">=7.4",
+        "php": ">=7.4|^8.0",
         "webmozart/assert": "^1.0",
         "symfony/event-dispatcher": "^4.0|^5.0|^6.0|^7.0"
     },
diff --git a/tests/Callbacks/CallClosureOnFailureTest.php b/tests/Callbacks/CallClosureOnFailureTest.php
index b9b92e6..5a21c7a 100644
--- a/tests/Callbacks/CallClosureOnFailureTest.php
+++ b/tests/Callbacks/CallClosureOnFailureTest.php
@@ -25,8 +25,8 @@ function () {
             'context',
             new StateMachine(
                 'state',
-                $this->createMock(StateRegistry::class),
-                $this->createMock(EventRegistry::class),
+                $this->createStub(StateRegistry::class),
+                $this->createStub(EventRegistry::class),
             )
         );
     }
diff --git a/tests/StateMachineTest.php b/tests/StateMachineTest.php
index 9b4b021..07d134e 100644
--- a/tests/StateMachineTest.php
+++ b/tests/StateMachineTest.php
@@ -104,7 +104,7 @@ public function test_it_should_visit_the_transitions(): void
     {
         $registry = $this->createMock(StateRegistry::class);
         $machine = new StateMachine('', $registry, $this->events);
-        $visitor = $this->createMock(TransitionVisitor::class);
+        $visitor = $this->createStub(TransitionVisitor::class);
 
         $registry
             ->expects($this->once())