diff --git a/cores/esp8266/TZ.h b/cores/esp8266/TZ.h
index 7ed1bf3dc1..ef3ed3d44e 100644
--- a/cores/esp8266/TZ.h
+++ b/cores/esp8266/TZ.h
@@ -1,7 +1,7 @@
 
 // autogenerated from https://raw.githubusercontent.com/nayarsystems/posix_tz_db/master/zones.csv
 // by script <esp8266 arduino core>/tools/TZupdate.sh
-// Wed Nov 27 23:41:03 UTC 2019
+// Mon Dec 16 13:08:18 UTC 2019
 //
 // This database is autogenerated from IANA timezone database
 //    https://www.iana.org/time-zones
diff --git a/package.json b/package.json
index 5ad2898f74..34a5efeeb1 100644
--- a/package.json
+++ b/package.json
@@ -2,5 +2,5 @@
     "name": "framework-arduinoespressif8266",
     "description": "Arduino Wiring-based Framework (ESP8266 Core)",
     "url": "https://github.com/esp8266/Arduino",
-    "version": "2.7.0-dev"
+    "version": "2.6.3"
 }
diff --git a/platform.txt b/platform.txt
index 678be1ba9d..afcc65c002 100644
--- a/platform.txt
+++ b/platform.txt
@@ -5,8 +5,8 @@
 # For more info:
 # https://github.com/arduino/Arduino/wiki/Arduino-IDE-1.5-3rd-party-Hardware-specification
 
-name=ESP8266 Boards (2.7.0-dev)
-version=2.7.0-dev
+name=ESP8266 Boards (2.6.3)
+version=2.6.3
 
 # These will be removed by the packager script when doing a JSON release
 runtime.tools.xtensa-lx106-elf-gcc.path={runtime.platform.path}/tools/xtensa-lx106-elf