diff --git a/platformio_tasmota_cenv_sample.ini b/platformio_tasmota_cenv_sample.ini
index e8627645d..85496d649 100644
--- a/platformio_tasmota_cenv_sample.ini
+++ b/platformio_tasmota_cenv_sample.ini
@@ -12,7 +12,7 @@ build_flags  = ${common.build_flags}
 
 [core_stage]
 ; *** Esp8266 core for Arduino version stage
-platform_packages           = framework-arduinoespressif8266 @ https://github.com/esp8266/Arduino/releases/download/3.0.0/esp8266-3.0.0.zip
+platform_packages           = framework-arduinoespressif8266 @ https://github.com/tasmota/Arduino.git#3.0.0.1
 ; *** 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}
@@ -22,7 +22,7 @@ build_flags                 = ${esp82xx_defaults.build_flags}
                               ;-DWAVEFORM_LOCKED_PHASE
                               -DWAVEFORM_LOCKED_PWM
                               ; 16k extra heap https://github.com/esp8266/Arduino/pull/7060
-                              -DMMU_IRAM_SIZE=0xC000
+                              -DPIO_FRAMEWORK_MMU__16KB_CACHE__48KB_IRAM
                               -Wno-switch-unreachable