diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 926beee81..91d5c2dd6 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -45,19 +45,19 @@ jobs:
             options: "-debug_arm"
             asm: ""
           - name: mac_release_64
-            image: macos-14
+            image: macos-15
             options: "-release_64"
             asm: "-asm"
           - name: mac_debug_64
-            image: macos-14
+            image: macos-15
             options: "-debug_64"
             asm: ""
           - name: mac_release_arm
-            image: macos-14
+            image: macos-15
             options: "-release_arm"
             asm: "-asm"
           - name: mac_debug_arm
-            image: macos-14
+            image: macos-15
             options: "-debug_arm"
             asm: ""
           - name: win_release_64
diff --git a/python/interpret-core/tests/test_ext.py b/python/interpret-core/tests/test_ext.py
index 4064b5d3e..c727157cb 100644
--- a/python/interpret-core/tests/test_ext.py
+++ b/python/interpret-core/tests/test_ext.py
@@ -2,7 +2,6 @@
 # Distributed under the MIT software license
 
 from interpret.glassbox import LogisticRegression
-from six import raise_from
 
 from .tutils import assert_valid_explanation, synthetic_classification
 
@@ -16,14 +15,11 @@ def test_import_demo_extension_classes():
         from interpret.ext.perf import ExamplePerfExplainer  # noqa
         from interpret.ext.provider import ExampleVisualizeProvider  # noqa
     except ImportError as import_error:
-        raise_from(
-            Exception(
-                "Failure in demo while trying "
-                "to load example explainers through extension_utils",
-                import_error,
-            ),
-            None,
+        msg = (
+            "Failure in demo while trying "
+            "to load example explainers through extension_utils"
         )
+        raise Exception(msg, import_error) from None
 
 
 def test_demo_blackbox_explainer():