diff --git a/cpp_Arduino_wave_generator/builds/Adafruit_feather_m4_express/CURRENT.UF2 b/cpp_Arduino_wave_generator/builds/Adafruit_feather_m4_express/CURRENT.UF2
index 7908b88..9a4a91f 100644
Binary files a/cpp_Arduino_wave_generator/builds/Adafruit_feather_m4_express/CURRENT.UF2 and b/cpp_Arduino_wave_generator/builds/Adafruit_feather_m4_express/CURRENT.UF2 differ
diff --git a/cpp_Arduino_wave_generator/platformio.ini b/cpp_Arduino_wave_generator/platformio.ini
index 1812234..4dd638a 100644
--- a/cpp_Arduino_wave_generator/platformio.ini
+++ b/cpp_Arduino_wave_generator/platformio.ini
@@ -8,7 +8,7 @@
 ; Please visit documentation for the other options and examples
 ; https://docs.platformio.org/page/projectconf.html
 [platformio]
-env_default = adafruit_feather_m4
+default_envs = adafruit_feather_m4
 
 [env:mzeropro]
 platform = atmelsam