diff --git a/ChangeLog b/ChangeLog
index daf2613..b1e8dff 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2022-04-22  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* VERSION: 1.21.
+	* doc/chopstx.texi (VERSION): 1.21.
+
 2022-04-21  NIIBE Yutaka  <gniibe@fsij.org>
 
 	Backport the changes from master.
diff --git a/NEWS b/NEWS
index a6cdc0e..61c3256 100644
--- a/NEWS
+++ b/NEWS
@@ -1,6 +1,16 @@
 NEWS - Noteworthy changes
 
 
+* Major changes in Chopstx 1.21
+
+  Released 2022-04-22
+
+** Fix of struct chx_qh and struct chx_thread/pq/px.
+
+Good compiler complains/warns for possible different size of
+structures.  To avoid this, access to the objects are fixed.
+
+
 * Major changes in Chopstx 1.20
 
   Released 2021-10-12
diff --git a/README b/README
index a65e668..e966d27 100644
--- a/README
+++ b/README
@@ -1,6 +1,6 @@
 Chopstx - Threads and only Threads
-							Version 1.20
-							  2021-10-12
+							Version 1.21
+							  2021-04-22
 							Niibe Yutaka
 					     Flying Stone Technology
 
diff --git a/VERSION b/VERSION
index a069ca3..4e7a6a4 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-release/1.20
+release/1.21
diff --git a/doc/chopstx.texi b/doc/chopstx.texi
index febba37..89ee306 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 1.20
+@set VERSION 1.21
 @settitle Chopstx Reference Manual
 @c Unify some of the indices.
 @syncodeindex tp fn