diff --git a/platformio.ini b/platformio.ini
index 19aa9d9..1326766 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -25,7 +25,7 @@ lib_deps_external =
     https://github.com/dx168b/async-mqtt-client
 
 [env:ttgo-lora32]
-platform = https://github.com/platformio/platform-espressif32.git
+platform = https://github.com/platformio/platform-espressif32.git#v3.3.2
 board = ttgo-lora32-v1
 framework = arduino
 monitor_speed = 115200