diff --git a/platformio.ini b/platformio.ini
index 5307b8e..5c5c0a9 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -12,7 +12,7 @@
 default_envs = heidelberg
 
 [env]
-platform = espressif32
+platform = espressif32@^6.8.1
 board = esp32doit-devkit-v1
 upload_protocol = esptool
 upload_port = /dev/ttyUSB*