diff --git a/README.md b/README.md
index 01d2a6e..db6fa59 100644
--- a/README.md
+++ b/README.md
@@ -9,77 +9,9 @@ Serial to Ethernet Module based on W5500 & Cortex-M0
 
 ### v1.4.0
 
+- First release
 - Added features
 	- Modbus
 		- v1.20 Configuration Tool is required.
-
-### v1.1.5
-
-- Added features
-	- AT+MPASS : (AT command) Change the module's name(automatically saved)
-	- AT+MNAME : (AT command) Change the module's password(automatically saved)
-- Changed
-	- AT+NMODE -> AT+MMODE
-
-### v1.1.4
-
-- Fixed Problems receiving data in AT Mode
-
-### v1.1.3
-
-- Fixed UDP Send Fail in AT Mode
-
-### v1.1.2
-
-- Fixed recevied data loss(During trans to serial) problem in AT Mode
-	- Limit max size(1000byte) of receive data from ethernet.
-
-### v1.1.1
-
-- Added inactivity time function in Server/Mixed Mode
-
-### v1.1.0
-
-- ioLibrary Update
-- Dependency Removal (remove "board.h" in "w5500.h")
-- Remove garbage file
-
-### v1.0.4
-
-- Fixed bug
-	- Time packing problem in UDP mode.
-		- Before : Not work normally after the first time.
-		- After : Work normally
-	- Upper and lower case problems in config Data.
-		- Before : Only uppercase letters work normally.
-		- After : Works in both uppercase and lowercase.
-
-### v1.0.3
-
-- Fixed bug
-	- AT Command Trigger
-		- Before : AT command is actived regardless of AT command enable.
-		- After : AT command is actived regard of AT command enable.
-- Added features
-	- AT+NMODE : (AT command) Change the settings that operates in data mode(automatically saved)
-
-### v1.0.2
-
-- Fixed bug 
-	- In mixed mode
-		- Before : when connecting to the server, the '+' had to be include in the serial data.
-		- After : when serial data is generated directly connecting.
-	- In AT command
-		- Before : at = a t. in other words, ignore space.
-		- After : at != a t. in other words, admitte space.
-- Added features
-	- Check unlink in mixed mode
-	- AT+FDNS = domain name
-
-### v1.0.1
-
-- Fixed Project set
-
-### v1.0.0
-
-- First release : Apr. 2015
+### Old version
+- See the following link. [https://github.com/Wiznet/WIZ550S2E](https://github.com/Wiznet/WIZ550S2E)