diff --git a/platformio_tasmota_cenv_sample.ini b/platformio_tasmota_cenv_sample.ini
index e6cca8334..26b234ca7 100644
--- a/platformio_tasmota_cenv_sample.ini
+++ b/platformio_tasmota_cenv_sample.ini
@@ -6,13 +6,13 @@ build_flags  = ${common.build_flags}
 
 [core]
 ; Activate (by removing the ";" in the next lines) if you want to override the standard core defined in platformio.ini !!!
-;platform_packages           = ${core_stage.platform_packages}
-;build_unflags               = ${core_stage.build_unflags}
-;build_flags                 = ${core_stage.build_flags}
+platform_packages           = ${core_stage.platform_packages}
+build_unflags               = ${core_stage.build_unflags}
+build_flags                 = ${core_stage.build_flags}
 
 [core_stage]
 ; *** Esp8266 core for Arduino version stage
-platform_packages           = framework-arduinoespressif8266 @ https://github.com/esp8266/Arduino.git
+platform_packages           = framework-arduinoespressif8266 @ https://github.com/esp8266/Arduino/releases/download/3.0.0/esp8266-3.0.0.zip
 ; *** Use Xtensa build chain 10.2. GNU23 from https://github.com/earlephilhower/esp-quick-toolchain
                               tasmota/toolchain-xtensa @ 5.100200.210303
 build_unflags               = ${esp_defaults.build_unflags}