diff --git a/tests/test_algorithms_troubleshoot.py b/tests/test_algorithms_troubleshoot.py
index 0732cbf..a5b157c 100644
--- a/tests/test_algorithms_troubleshoot.py
+++ b/tests/test_algorithms_troubleshoot.py
@@ -341,7 +341,7 @@ def test_measure_modulated_light_dual_phase_stepping_with_noise(
     # Aberration and image source
     img = np.zeros((64, 64), dtype=np.int16)
     img[32, 32] = 100
-    src = StaticSource(img, 200 * u.nm)
+    src = StaticSource(img, pixel_size= 200 * u.nm)
 
     # SLM, simulation, camera, ROI detector
     slm = SLM(
diff --git a/tests/test_simulation.py b/tests/test_simulation.py
index 5ae8443..ecf903e 100644
--- a/tests/test_simulation.py
+++ b/tests/test_simulation.py
@@ -20,7 +20,7 @@ def test_mock_camera_and_single_roi():
     """
     img = np.zeros((1000, 1000), dtype=np.int16)
     img[200, 300] = 39.39  # some random float
-    src = Camera(StaticSource(img, 450 * u.nm))
+    src = Camera(StaticSource(img, pixel_size=  450 * u.nm))
     roi_detector = SingleRoi(
         src, pos=(200, 300), radius=0
     )  # Only measure that specific point
@@ -38,7 +38,7 @@ def test_microscope_without_magnification(shape):
     # construct input image
     img = np.zeros(shape, dtype=np.int16)
     img[256, 256] = 100
-    src = Camera(StaticSource(img, 400 * u.nm))
+    src = Camera(StaticSource(img, pixel_size=  400 * u.nm))
 
     # construct microscope
     sim = Microscope(
@@ -84,7 +84,7 @@ def test_slm_and_aberration():
     """
     img = np.zeros((1000, 1000), dtype=np.int16)
     img[256, 256] = 100
-    src = Camera(StaticSource(img, 400 * u.nm))
+    src = Camera(StaticSource(img, pixel_size= 400 * u.nm))
 
     slm = SLM(shape=(512, 512))