diff --git a/CMakeLists.txt b/CMakeLists.txt
index 03e068d3..3f695c45 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,6 +1,6 @@
 cmake_minimum_required(VERSION 3.1)
 project(oniguruma
-  VERSION 6.9.8
+  VERSION 6.9.9
   LANGUAGES C)
 
 set(PACKAGE onig)
diff --git a/README.md b/README.md
index 44f19ec6..594a79f4 100644
--- a/README.md
+++ b/README.md
@@ -33,7 +33,7 @@ Notice (from 6.9.6)
 When using configure script, if you have the POSIX API enabled in an earlier version (disabled by default in 6.9.5) and you need application binary compatibility with the POSIX API, specify "--enable-binary-compatible-posix-api=yes" instead of "--enable-posix-api=yes". Starting in 6.9.6, "--enable-posix-api=yes" only supports source-level compatibility for 6.9.5 and earlier about POSIX API. (Issue #210)
 
 
-Master branch
+Version 6.9.9
 -------------
 * Update Unicode version 15.1.0
 * NEW API: ONIG_OPTION_MATCH_WHOLE_STRING
@@ -73,24 +73,6 @@ Version 6.9.6
 * Under cygwin and mingw, generate and install the libonig.def file (Issue #220)
 
 
-Version 6.9.5 revised 1
------------------------
-
-* Fixed Issue #192
-
-
-Version 6.9.5
--------------
-
-* POSIX API disabled by default for Unix (* Enabled by: configure --enable-posix-api=yes)
-* Update Unicode version 13.0.0
-* NEW: Code point sequence notation \x{HHHH HHHH ...}, \o{OOOO OOOO ...}
-* NEW API: retry limit in search functions
-* NEW API: maximum nesting level of subexp call
-* Fixed behavior of isolated options in Perl and Java syntaxes.  /...(?i).../
-
-
-
 License
 -------
 
diff --git a/configure.ac b/configure.ac
index d6af76b4..470fa3cf 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,5 +1,5 @@
 dnl Process this file with autoconf to produce a configure script.
-AC_INIT(onig, 6.9.8)
+AC_INIT(onig, 6.9.9)
 
 AC_CONFIG_MACRO_DIR([m4])
 
@@ -54,7 +54,7 @@ fi
 dnl Checks for programs.
 AC_PROG_CC
 LT_INIT
-LTVERSION="8:0:3"
+LTVERSION="9:0:4"
 AC_SUBST(LTVERSION)
 
 AC_PROG_INSTALL
diff --git a/src/oniguruma.h b/src/oniguruma.h
index ffca9a1c..66da3190 100644
--- a/src/oniguruma.h
+++ b/src/oniguruma.h
@@ -36,9 +36,9 @@ extern "C" {
 #define ONIGURUMA
 #define ONIGURUMA_VERSION_MAJOR   6
 #define ONIGURUMA_VERSION_MINOR   9
-#define ONIGURUMA_VERSION_TEENY   8
+#define ONIGURUMA_VERSION_TEENY   9
 
-#define ONIGURUMA_VERSION_INT     60908
+#define ONIGURUMA_VERSION_INT     60909
 
 #ifndef P_
 #if defined(__STDC__) || defined(_WIN32)