diff --git a/autocnet/cg/change_detection.py b/autocnet/cg/change_detection.py
index c238db56b8b13490e0e353f2cedc6c1f01984039..1265049951dd73aa179c89654c1a16f4838fe6b2 100644
--- a/autocnet/cg/change_detection.py
+++ b/autocnet/cg/change_detection.py
@@ -26,7 +26,12 @@ import richdem as rd
 import pandas as pd
 import geopandas as gpd
 
-from kalasiris import specialpixels
+try:
+    import kalasiris as isis
+except Exception as exception:
+    from autocnet.utils.utils import FailedImport
+    isis = FailedImport(exception)
+
 
 from autocnet.utils.utils import bytescale
 from autocnet.matcher.cpu_extractor import extract_features
@@ -57,7 +62,7 @@ def image_diff(arr1, arr2):
     arr1[arr1 == 0] = np.nan
     arr2[arr2 == 0] = np.nan
 
-    isis_null = specialpixels.Real.Null
+    isis_null = isis.specialpixels.Real.Null
     arr1[arr1 == isis_null] = np.nan
     arr2[arr2 == isis_null] = np.nan
 
@@ -92,7 +97,7 @@ def image_ratio(arr1, arr2):
     arr1[arr1 == 0] = np.nan
     arr2[arr2 == 0] = np.nan
 
-    isis_null = specialpixels.Real.Null
+    isis_null = isis.specialpixels.Real.Null
     arr1[arr1 == isis_null] = np.nan
     arr2[arr2 == isis_null] = np.nan
 
diff --git a/autocnet/cg/tests/test_change_detection.py b/autocnet/cg/tests/test_change_detection.py
index b56328f5a88435d01f3ee13ffb093c2d627f6de5..676dfcf703f86e82b0d9f4b3b1416778fbf73bd1 100644
--- a/autocnet/cg/tests/test_change_detection.py
+++ b/autocnet/cg/tests/test_change_detection.py
@@ -12,7 +12,7 @@ import unittest
 import numpy as np
 import numpy.testing as npt
 from autocnet.cg import change_detection as cd
-
+from autocnet.utils.utils import FailedImport
 
 class TestISIS(unittest.TestCase):
 
@@ -20,16 +20,18 @@ class TestISIS(unittest.TestCase):
         arr1 = np.array([1.0, 2.0, -3.4028227e+38])
         arr2 = np.array([1.0, 3.0, 0])
 
-        npt.assert_array_equal(
-            np.array([0, -1.0, 0]),
-            cd.image_diff(arr1, arr2)
-        )
+        if not isinstance(cd.isis, FailedImport):
+            npt.assert_array_equal(
+                np.array([0, -1.0, 0]),
+                cd.image_diff(arr1, arr2)
+            )
 
     def test_image_ratio(self):
         arr1 = np.array([1.0, 4.0, -3.4028227e+38])
         arr2 = np.array([1.0, 2.0, 0])
 
-        npt.assert_array_equal(
-            np.array([1.0, 2.0, 0]),
-            cd.image_ratio(arr1, arr2)
-        )
\ No newline at end of file
+        if not isinstance(cd.isis, FailedImport):
+            npt.assert_array_equal(
+                np.array([1.0, 2.0, 0]),
+                cd.image_ratio(arr1, arr2)
+            )
\ No newline at end of file
diff --git a/autocnet/utils/hirise.py b/autocnet/utils/hirise.py
index 1258b1039f9bfe1fcedcae9acd3f741fa12029f9..bd44a062a3f97ff0f8567bc6361ca1d4643f5431 100644
--- a/autocnet/utils/hirise.py
+++ b/autocnet/utils/hirise.py
@@ -3,7 +3,12 @@ from glob import glob
 import textwrap
 import geopandas as gpd
 
-import kalasiris as isis
+try:
+    import kalasiris as isis
+except Exception as exception:
+    from autocnet.utils.utils import FailedImport
+    isis = FailedImport(exception)
+    
 from subprocess import CalledProcessError
 
 from plio.io.io_gdal import GeoDataset