diff --git a/ChangeLog b/ChangeLog
index 2c4dd31c..add0d82d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2008-02-18  Tatsuhiro Tsujikawa  <tujikawa at rednoah dot com>
+
+	Bump version number to 0.13.0b
+	* configure.ac
+
 2008-02-18  Tatsuhiro Tsujikawa  <tujikawa at rednoah dot com>
 
 	Updated doc.
diff --git a/configure b/configure
index a3ca6c7c..6b02a0bd 100755
--- a/configure
+++ b/configure
@@ -1,6 +1,6 @@
 #! /bin/sh
 # Guess values for system-dependent variables and create Makefiles.
-# Generated by GNU Autoconf 2.61 for aria2c 0.12.0.
+# Generated by GNU Autoconf 2.61 for aria2c 0.13.0b.
 #
 # Report bugs to <t-tujikawa@users.sourceforge.net>.
 #
@@ -574,8 +574,8 @@ SHELL=${CONFIG_SHELL-/bin/sh}
 # Identity of this package.
 PACKAGE_NAME='aria2c'
 PACKAGE_TARNAME='aria2c'
-PACKAGE_VERSION='0.12.0'
-PACKAGE_STRING='aria2c 0.12.0'
+PACKAGE_VERSION='0.13.0b'
+PACKAGE_STRING='aria2c 0.13.0b'
 PACKAGE_BUGREPORT='t-tujikawa@users.sourceforge.net'
 
 ac_unique_file="src/Socket.h"
@@ -1329,7 +1329,7 @@ if test "$ac_init_help" = "long"; then
   # Omit some internal or obsolete options to make the list less imposing.
   # This message is too long to be a string in the A/UX 3.1 sh.
   cat <<_ACEOF
-\`configure' configures aria2c 0.12.0 to adapt to many kinds of systems.
+\`configure' configures aria2c 0.13.0b to adapt to many kinds of systems.
 
 Usage: $0 [OPTION]... [VAR=VALUE]...
 
@@ -1400,7 +1400,7 @@ fi
 
 if test -n "$ac_init_help"; then
   case $ac_init_help in
-     short | recursive ) echo "Configuration of aria2c 0.12.0:";;
+     short | recursive ) echo "Configuration of aria2c 0.13.0b:";;
    esac
   cat <<\_ACEOF
 
@@ -1528,7 +1528,7 @@ fi
 test -n "$ac_init_help" && exit $ac_status
 if $ac_init_version; then
   cat <<\_ACEOF
-aria2c configure 0.12.0
+aria2c configure 0.13.0b
 generated by GNU Autoconf 2.61
 
 Copyright (C) 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001,
@@ -1542,7 +1542,7 @@ cat >config.log <<_ACEOF
 This file contains any messages produced by compilers while
 running configure, to aid debugging if configure makes a mistake.
 
-It was created by aria2c $as_me 0.12.0, which was
+It was created by aria2c $as_me 0.13.0b, which was
 generated by GNU Autoconf 2.61.  Invocation command line was
 
   $ $0 $@
@@ -2339,7 +2339,7 @@ fi
 
 # Define the identity of the package.
  PACKAGE='aria2c'
- VERSION='0.12.0'
+ VERSION='0.13.0b'
 
 
 cat >>confdefs.h <<_ACEOF
@@ -19177,7 +19177,7 @@ exec 6>&1
 # report actual input values of CONFIG_FILES etc. instead of their
 # values after options handling.
 ac_log="
-This file was extended by aria2c $as_me 0.12.0, which was
+This file was extended by aria2c $as_me 0.13.0b, which was
 generated by GNU Autoconf 2.61.  Invocation command line was
 
   CONFIG_FILES    = $CONFIG_FILES
@@ -19230,7 +19230,7 @@ Report bugs to <bug-autoconf@gnu.org>."
 _ACEOF
 cat >>$CONFIG_STATUS <<_ACEOF
 ac_cs_version="\\
-aria2c config.status 0.12.0
+aria2c config.status 0.13.0b
 configured by $0, generated by GNU Autoconf 2.61,
   with options \\"`echo "$ac_configure_args" | sed 's/^ //; s/[\\""\`\$]/\\\\&/g'`\\"
 
diff --git a/configure.ac b/configure.ac
index 21eb440e..319cbfa9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2,7 +2,7 @@
 # Process this file with autoconf to produce a configure script.
 #
 AC_PREREQ(2.59)
-AC_INIT(aria2c, 0.12.0, t-tujikawa@users.sourceforge.net)
+AC_INIT(aria2c, 0.13.0b, t-tujikawa@users.sourceforge.net)
 AC_CANONICAL_HOST
 AC_CANONICAL_SYSTEM
 AM_INIT_AUTOMAKE()