diff --git a/ChangeLog b/ChangeLog
index c314877..515b8a5 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2021-10-12  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* VERSION: 1.20.
+	* doc/chopstx.texi (VERSION): 1.20.
+
 2021-10-11  NIIBE Yutaka  <gniibe@fsij.org>
 
 	Backport from master.
diff --git a/NEWS b/NEWS
index 88f6aac..a6cdc0e 100644
--- a/NEWS
+++ b/NEWS
@@ -1,6 +1,15 @@
 NEWS - Noteworthy changes
 
 
+* Major changes in Chopstx 1.20
+
+  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 1.19
 
   Released 2021-02-18
diff --git a/README b/README
index 8c89ea6..a65e668 100644
--- a/README
+++ b/README
@@ -1,6 +1,6 @@
 Chopstx - Threads and only Threads
-							Version 1.19
-							  2021-02-18
+							Version 1.20
+							  2021-10-12
 							Niibe Yutaka
 					     Flying Stone Technology
 
@@ -62,12 +62,4 @@ Future Works
 
 RISC-V port (for GD32VF103) is available in 2.x.  Please have a look
 at the master branch, and test it if possible.
-
-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.
 -- 
diff --git a/VERSION b/VERSION
index 74aad3c..a069ca3 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-release/1.19
+release/1.20
diff --git a/doc/chopstx.texi b/doc/chopstx.texi
index febb3a9..febba37 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 1.19
+@set VERSION 1.20
 @settitle Chopstx Reference Manual
 @c Unify some of the indices.
 @syncodeindex tp fn