diff --git a/y2023/constants.h b/y2023/constants.h
index 2f16f1a..32ed317 100644
--- a/y2023/constants.h
+++ b/y2023/constants.h
@@ -170,7 +170,7 @@
   }
 
   // if true, tune down all the arm constants for testing.
-  static constexpr bool kArmGrannyMode() { return true; }
+  static constexpr bool kArmGrannyMode() { return false; }
 
   // the operating voltage.
   static constexpr double kArmOperatingVoltage() {