diff --git a/optimizely/decision_service.py b/optimizely/decision_service.py
index 28275ef..0648952 100644
--- a/optimizely/decision_service.py
+++ b/optimizely/decision_service.py
@@ -457,7 +457,8 @@ def get_variation(
             }
 
         # Check to see if user has a decision available for the given experiment
-        if user_profile_tracker is not None and not ignore_user_profile:
+        # CMAB experiments are excluded from UserProfileService to allow dynamic decisions
+        if user_profile_tracker is not None and not ignore_user_profile and not experiment.cmab:
             variation = self.get_stored_variation(project_config, experiment, user_profile_tracker.get_user_profile())
             if variation:
                 message = f'Returning previously activated variation ID "{variation}" of experiment ' \
@@ -472,6 +473,10 @@ def get_variation(
                 }
             else:
                 self.logger.warning('User profile has invalid format.')
+        elif user_profile_tracker is not None and not ignore_user_profile and experiment.cmab:
+            message = 'User profile service excluded for CMAB experiment to allow dynamic decisions.'
+            self.logger.info(message)
+            decide_reasons.append(message)
 
         # Check audience conditions
         audience_conditions = experiment.get_audience_conditions_or_ids()
@@ -529,7 +534,8 @@ def get_variation(
             self.logger.info(message)
             decide_reasons.append(message)
             # Store this new decision and return the variation for the user
-            if user_profile_tracker is not None and not ignore_user_profile:
+            # CMAB experiments are excluded from UserProfileService
+            if user_profile_tracker is not None and not ignore_user_profile and not experiment.cmab:
                 try:
                     user_profile_tracker.update_user_profile(experiment, variation)
                 except:
diff --git a/tests/test_decision_service.py b/tests/test_decision_service.py
index dbcb743..97356e6 100644
--- a/tests/test_decision_service.py
+++ b/tests/test_decision_service.py
@@ -1074,6 +1074,93 @@ def test_get_variation_cmab_experiment_with_whitelisted_variation(self):
             mock_bucket.assert_not_called()
             mock_cmab_decision.assert_not_called()
 
+    def test_get_variation_cmab_experiment_excludes_user_profile_service(self):
+        """Test that CMAB experiments exclude UserProfileService for both load and save operations."""
+
+        # Create a user context
+        user = optimizely_user_context.OptimizelyUserContext(
+            optimizely_client=None,
+            logger=None,
+            user_id="test_user",
+            user_attributes={}
+        )
+
+        # Create a CMAB experiment
+        cmab_experiment = entities.Experiment(
+            id='111150',
+            key='cmab_experiment',
+            status='Running',
+            audienceIds=[],
+            variations=[entities.Variation('111151', 'variation_1')],
+            forcedVariations={},
+            trafficAllocation=[{'entityId': '111151', 'endOfRange': 10000}],
+            layerId='111150',
+            cmab=True
+        )
+
+        # Create a mock user profile service
+        mock_ups = mock.Mock()
+        mock_ups.lookup.return_value = {
+            'user_id': 'test_user',
+            'experiment_bucket_map': {
+                '111150': {'variation_id': '111152'}  # Different variation in profile
+            }
+        }
+
+        # Create decision service with user profile service
+        decision_service_with_ups = decision_service.DecisionService(
+            mock.MagicMock(),
+            mock_ups,
+            mock.MagicMock()
+        )
+
+        # Mock the CMAB decision to return variation_1
+        cmab_decision_result = {
+            'error': False,
+            'result': {'variation_id': '111151', 'cmab_uuid': 'test-uuid'},
+            'reasons': ['CMAB decision made']
+        }
+
+        with mock.patch('optimizely.helpers.experiment.is_experiment_running',
+                       return_value=True), \
+            mock.patch.object(self.project_config, 'get_variation_from_id',
+                             return_value=entities.Variation('111151', 'variation_1')), \
+            mock.patch('optimizely.bucketer.Bucketer.bucket_to_entity_id',
+                      return_value=('111151', [])), \
+            mock.patch.object(decision_service_with_ups, '_get_decision_for_cmab_experiment',
+                             return_value=cmab_decision_result):
+
+            # Create user profile tracker
+            from optimizely.user_profile import UserProfileTracker
+            user_profile_tracker = UserProfileTracker('test_user', mock_ups, mock.MagicMock())
+
+            # Call get_variation with user profile tracker
+            variation_result = decision_service_with_ups.get_variation(
+                self.project_config,
+                cmab_experiment,
+                user,
+                user_profile_tracker
+            )
+
+            variation = variation_result['variation']
+            cmab_uuid = variation_result['cmab_uuid']
+            reasons = variation_result['reasons']
+
+            # Verify that UPS was NOT used to load the saved variation (111152)
+            # Instead, CMAB decision returned variation_1 (111151)
+            self.assertEqual('variation_1', variation.key)
+            self.assertEqual('111151', variation.id)
+            self.assertEqual('test-uuid', cmab_uuid)
+
+            # Verify the exclusion reason is in the decision reasons
+            self.assertIn('User profile service excluded for CMAB experiment to allow dynamic decisions.', reasons)
+
+            # Verify UPS lookup was NOT called (CMAB should bypass UPS load)
+            mock_ups.lookup.assert_not_called()
+
+            # Verify UPS save was NOT called (CMAB should bypass UPS save)
+            mock_ups.save.assert_not_called()
+
 
 class FeatureFlagDecisionTests(base.BaseTest):
     def setUp(self):