diff --git a/platformio.ini b/platformio.ini
index 9e0c28e9a..2c78a4583 100755
--- a/platformio.ini
+++ b/platformio.ini
@@ -108,7 +108,7 @@ build_flags               = ${tasmota_core_stage.build_flags}
 
 [tasmota_core_stage]
 ; *** Esp8266 core for Arduino version stable beta
-platform                  = espressif8266@2.3.3
+platform                  = espressif8266@2.4.0
 platform_packages         = framework-arduinoespressif8266 @ https://github.com/esp8266/Arduino.git#372a3ec297dfe8501bed1ec4552244695b5e8ced
 build_flags               = ${esp82xx_defaults.build_flags}
                             -DBEARSSL_SSL_BASIC
diff --git a/platformio_override_sample.ini b/platformio_override_sample.ini
index deeafc3ee..f8ff1af64 100644
--- a/platformio_override_sample.ini
+++ b/platformio_override_sample.ini
@@ -134,7 +134,7 @@ build_flags               = ${esp82xx_defaults.build_flags}
 
 [core_2_6_3]
 ; *** Esp8266 core for Arduino version 2.6.3
-platform                  = espressif8266@2.3.3
+platform                  = espressif8266@2.4.0
 platform_packages         =
 build_flags               = ${esp82xx_defaults.build_flags}
                             -DBEARSSL_SSL_BASIC
@@ -178,7 +178,7 @@ build_flags               = ${esp82xx_defaults.build_flags}
 
 [tasmota_feature_stage]
 ; *** Esp8266 core for Arduino version Tasmota feature stage
-platform                  = espressif8266@2.3.3
+platform                  = espressif8266@2.4.0
 platform_packages         = framework-arduinoespressif8266 @ https://github.com/esp8266/Arduino.git#e64cb619f79a3c888dd56b957d8f48ce74f35735
 build_flags               = ${esp82xx_defaults.build_flags}
                             -DBEARSSL_SSL_BASIC
@@ -222,7 +222,7 @@ build_flags               = ${esp82xx_defaults.build_flags}
 
 [core_stage]
 ; *** Esp8266 core for Arduino version latest beta
-platform                  = espressif8266@2.3.3
+platform                  = espressif8266@2.4.0
 platform_packages         = framework-arduinoespressif8266 @ https://github.com/esp8266/Arduino.git
 build_flags               = ${esp82xx_defaults.build_flags}
                             -DBEARSSL_SSL_BASIC