diff --git a/LICENSE b/LICENSE
index f19ff55..2e9fc95 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,4 +1,4 @@
-Copyright (c) 2021-2022 Osamu Tatebe.  All Rights Reserved.
+Copyright (c) 2021-2023 Osamu Tatebe.  All Rights Reserved.
 
 The authors hereby grant permission to use, copy, modify, and
 distribute this software and its documentation for any purpose,
diff --git a/RELNOTE.md b/RELNOTE.md
index 0d328c8..4decb31 100644
--- a/RELNOTE.md
+++ b/RELNOTE.md
@@ -1,3 +1,21 @@
+# Release note for CHFS 2.1.0 (2023/5/11)
+
+## New environment variables
+- CHFS_LOOKUP_LOCAL - connect to a local chfsd only
+
+## New features
+- chfsctl - -x option to export environment variable
+- chfsctl - -i option to specify an interval in seconds to execute chfsd
+
+## Updated features
+- libchfs - randomize order for RPCs for all servers
+- chfsctl - warn if less number of servers running
+
+## Bug fixes
+- fix compilation error in gcc 9.4.0
+- chfsd - chfsd does not terminate
+- chfsd - chfs_symlink may fail
+
 # Release note for CHFS 2.0.0 (2022/10/21)
 
 ## New commands
diff --git a/configure.ac b/configure.ac
index 1c5acec..5f65cf7 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2,7 +2,7 @@
 # Process this file with autoconf to produce a configure script.
 
 AC_PREREQ([2.69])
-AC_INIT([CHFS], [2.0.0])
+AC_INIT([CHFS], [2.1.0])
 AM_INIT_AUTOMAKE([-Wall -Werror foreign])
 AC_CONFIG_SRCDIR([README.md])
 AC_CONFIG_HEADERS([lib/config.h])