diff --git a/differt/tests/em/test_antenna.py b/differt/tests/em/test_antenna.py
index f0b83adb..40b1b551 100644
--- a/differt/tests/em/test_antenna.py
+++ b/differt/tests/em/test_antenna.py
@@ -38,7 +38,7 @@ def test_wavenumber(self, antenna: Antenna) -> None:
     def test_abstract(self):
         with pytest.raises(
             TypeError,
-            match="Can't instantiate abstract class Antenna with abstract methods",
+            match="Can't instantiate abstract class Antenna",
         ):
             _ = Antenna(frequency=1e9)  # type: ignore[reportAbstractUsage]
 
diff --git a/differt/tests/test_integration.py b/differt/tests/test_integration.py
index 85ac3528..66ac51a8 100644
--- a/differt/tests/test_integration.py
+++ b/differt/tests/test_integration.py
@@ -13,6 +13,7 @@
 from differt.scene import TriangleScene
 
 
+@pytest.mark.slow
 def test_ray_casting() -> None:
     o3d = pytest.importorskip("open3d")
 
@@ -75,6 +76,7 @@ def test_ray_casting() -> None:
     )
 
 
+@pytest.mark.slow
 def test_simple_street_canyon() -> None:
     sionna = pytest.importorskip("sionna")
     file = sionna.rt.scene.simple_street_canyon