diff --git a/ChangeLog b/ChangeLog
index 14b4d0b..b0a1758 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2021-10-12  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* VERSION: 2.3
+	* doc/chopstx.texi (VERSION): 2.3.
+
 2021-10-11  NIIBE Yutaka  <gniibe@fsij.org>
 
 	* mcu/usb-usbip.c (URB_DATA_SIZE): Tweak the value.
diff --git a/NEWS b/NEWS
index d027bf3..8514076 100644
--- a/NEWS
+++ b/NEWS
@@ -1,6 +1,15 @@
 NEWS - Noteworthy changes
 
 
+* Major changes in Chopstx 2.3
+
+  Released 2021-10-12
+
+** Fix of USB driver for GNU/Linux emulation
+
+Fix the value of URB_DATA_SIZE, so that Gnuk can work with PC/SC.
+
+
 * Major changes in Chopstx 2.2
 
   Released 2021-02-25
diff --git a/README b/README
index 9143041..9209624 100644
--- a/README
+++ b/README
@@ -1,6 +1,6 @@
 Chopstx - Threads and only Threads
-							 Version 2.2
-							  2020-02-26
+							 Version 2.3
+							  2021-10-12
 							Niibe Yutaka
 					     Flying Stone Technology
 
@@ -28,7 +28,8 @@ Note that this library is _not_ related to the hand game:
     https://en.wikipedia.org/wiki/Chopsticks_(hand_game)
 
 Thanks to Yao Wei and Enrico Zini for giving me an opportunity
-visiting the wiki page above, when my children were playing the game.
+visiting the wiki page above in Debconf Taiwan, when my children were
+playing the game.
 
 
 License
@@ -65,7 +66,7 @@ Convenience function to determine the bottom of thread stack,
 configuration of thread size by compiler's output would be next things
 to be done.
 
-Experimental SMP port for Cortex-A7 is under development.  For SMP,
-more careful considerations for shared access to objects of struct
-chx_pq is needed.  So, modifications required will not be small.
+We have an experimental SMP port for Cortex-A7.  For SMP, more careful
+considerations for shared access to objects of struct chx_pq is
+needed.  So, modifications required will not be small.
 -- 
diff --git a/VERSION b/VERSION
index e20a3d4..1fcaede 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-release/2.1
+release/2.3
diff --git a/doc/chopstx.texi b/doc/chopstx.texi
index 1e8c7f2..3822218 100644
--- a/doc/chopstx.texi
+++ b/doc/chopstx.texi
@@ -1,7 +1,7 @@
 \input texinfo                      @c -*-texinfo-*-
 @c %**start of header
 @setfilename chopstx.info
-@set VERSION 2.2
+@set VERSION 2.3
 @settitle Chopstx Reference Manual
 @c Unify some of the indices.
 @syncodeindex tp fn