diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index af985af..a38a036 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        php: [7.2]
+        php: [7.2, 7.3, 7.4, 8.0, 8.1, 8.2]
       fail-fast: true
     steps:
       - uses: actions/checkout@v4
diff --git a/composer.json b/composer.json
index 1172a43..37555a5 100644
--- a/composer.json
+++ b/composer.json
@@ -40,7 +40,7 @@
         "ext-json": "*",
 
         "mikey179/vfsstream": "~1.4",
-        "phpspec/phpspec": "~4.0",
+        "phpspec/phpspec": "~6.0|~7.0",
 
         "behat/behat": "~3.0",
 
diff --git a/tests/spec/RulerZ/Context/ExecutionContextSpec.php b/tests/spec/RulerZ/Context/ExecutionContextSpec.php
index e4732f9..e56ffce 100644
--- a/tests/spec/RulerZ/Context/ExecutionContextSpec.php
+++ b/tests/spec/RulerZ/Context/ExecutionContextSpec.php
@@ -29,8 +29,8 @@ public function it_allows_property_access_through_offset($object)
 
     public function it_allows_testing_property_existence($object)
     {
-        $this->offsetExists('some')->shouldReturn(true);
-        $this->offsetExists('non_existent_offset')->shouldReturn(false);
+        $this->shouldHaveKey('some');
+        $this->shouldNotHaveKey('non_existent_offset');
     }
 
     public function it_forbids_setting_properties()
diff --git a/tests/spec/RulerZ/Context/ObjectContextSpec.php b/tests/spec/RulerZ/Context/ObjectContextSpec.php
index 88a8b67..48a0116 100644
--- a/tests/spec/RulerZ/Context/ObjectContextSpec.php
+++ b/tests/spec/RulerZ/Context/ObjectContextSpec.php
@@ -38,8 +38,8 @@ public function it_allows_testing_property_existence($object)
     {
         $object->property = 42;
 
-        $this->offsetExists('property')->shouldReturn(true);
-        $this->offsetExists('non_existent_property')->shouldReturn(false);
+        $this->shouldHaveKey('property');
+        $this->shouldNotHaveKey('non_existent_property');
     }
 
     public function it_forbids_setting_properties()