diff --git a/TDDMicroExercises/Ruby/tire_pressure_monitoring_system/test/policy_test.rb b/TDDMicroExercises/Ruby/tire_pressure_monitoring_system/test/policy_test.rb
index f2406f9..fced0e3 100644
--- a/TDDMicroExercises/Ruby/tire_pressure_monitoring_system/test/policy_test.rb
+++ b/TDDMicroExercises/Ruby/tire_pressure_monitoring_system/test/policy_test.rb
@@ -29,7 +29,7 @@ def test_alarm_is_off_after_policy_initialized
   end
 
   def test_alarm_is_on_after_pressure_exceeds_high_pressure
-    @sensor.psi_value = 30
+    @sensor.psi_value = 22
     @policy.detect
     assert_equal true, @alarm.is_alarm_on
   end