diff --git a/lib/optimizely/decision_service.rb b/lib/optimizely/decision_service.rb
index 051a8b6..f488669 100644
--- a/lib/optimizely/decision_service.rb
+++ b/lib/optimizely/decision_service.rb
@@ -100,7 +100,8 @@ def get_variation(project_config, experiment_id, user_context, user_profile_trac
 
       should_ignore_user_profile_service = decide_options.include? Optimizely::Decide::OptimizelyDecideOption::IGNORE_USER_PROFILE_SERVICE
       # Check for saved bucketing decisions if decide_options do not include ignoreUserProfileService
-      unless should_ignore_user_profile_service && user_profile_tracker
+      # Skip UPS for CMAB experiments as they require dynamic decisions
+      if !should_ignore_user_profile_service && user_profile_tracker && !experiment.key?('cmab')
         saved_variation_id, reasons_received = get_saved_variation_id(project_config, experiment_id, user_profile_tracker.user_profile)
         decide_reasons.push(*reasons_received)
         if saved_variation_id
@@ -109,6 +110,10 @@ def get_variation(project_config, experiment_id, user_context, user_profile_trac
           decide_reasons.push(message)
           return VariationResult.new(nil, false, decide_reasons, saved_variation_id)
         end
+      elsif experiment.key?('cmab')
+        message = "Skipping User Profile Service for CMAB experiment '#{experiment_key}'."
+        @logger.log(Logger::DEBUG, message)
+        decide_reasons.push(message)
       end
 
       # Check audience conditions
@@ -155,7 +160,8 @@ def get_variation(project_config, experiment_id, user_context, user_profile_trac
       decide_reasons.push(message) if message
 
       # Persist bucketing decision
-      user_profile_tracker.update_user_profile(experiment_id, variation_id) unless should_ignore_user_profile_service && user_profile_tracker
+      # Skip UPS for CMAB experiments as they require dynamic decisions
+      user_profile_tracker.update_user_profile(experiment_id, variation_id) if !should_ignore_user_profile_service && user_profile_tracker && !experiment.key?('cmab')
       VariationResult.new(cmab_uuid, false, decide_reasons, variation_id)
     end