diff --git a/platformio.ini b/platformio.ini
index 03c4358..4a9a7a5 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -1,5 +1,5 @@
 [env]
-platform = espressif32
+platform = espressif32 @ 2.1.0
 framework = arduino
 lib_ldf_mode = deep+
 monitor_speed = 115200