diff --git a/esphome/core_config.py b/esphome/core_config.py
index 5cfff6c4d9..35f2fa1f80 100644
--- a/esphome/core_config.py
+++ b/esphome/core_config.py
@@ -45,6 +45,7 @@ def validate_board(value):
 validate_platform = cv.one_of('ESP32', 'ESP8266', upper=True)
 
 PLATFORMIO_ESP8266_LUT = {
+    '2.6.3': 'espressif8266@2.3.2',
     '2.6.2': 'espressif8266@2.3.1',
     '2.6.1': 'espressif8266@2.3.0',
     '2.5.2': 'espressif8266@2.2.3',