diff --git a/platformio.ini b/platformio.ini
index f6e3c0f..adad702 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -57,7 +57,7 @@ version = 1.4.0
 
 ; Defaults
 [esp8266_defaults]
-platform = espressif8266
+platform = espressif8266@^4.2.1
 lib_deps = 
 	${env.lib_deps}
 	nrwiersma/ESP8266Scheduler@^1.2