diff --git a/ChangeLog.txt b/ChangeLog.txt
index 02fe6be61..882efb08f 100644
--- a/ChangeLog.txt
+++ b/ChangeLog.txt
@@ -7,12 +7,16 @@ Primary author and maintainer: Erwin Coumans
 
 	- added Vector Math library for SIMD 3D graphics linear algebra (vector, matrix, quaternion)
 		See Bullet/Extras/vectormathlibrary
-		Supports SIMD SSE, PowerPC PPU and Cell SPU, as well as generic portable scalar version
+		Supports SIMD SSE, PowerPC PPU and Cell SPU (including PS3 Linux and CellBlade), as well as generic portable scalar version
+		Will be used to improve BulletMultiThreaded performance
 		Open Sourced by Sony Computer Entertainment Inc. under the new BSD license
 	- added SIMD math library
+		4-way SIMD for common math functions like atan2f4, cosf4, floorf4, fabsf4, rsqrtf4 etc. Used by Vector Math library under PPU and SPU.
+		Supports PowerPC (PPU) and Cell SPU, including PS3 Linux and CellBlade.
 		See Bullet/Extras/simdmathlibrary
 		Open sourced by Sony Computer Entertainment Inc. under the new BSD license
 
+	
 2007 July 25
 	- added several patches: per-rigidbody sleeping threshold. added Assert to prevent deletion of rigidbody while constraints are still pointing at it
 		Thanks to Marten Svanfeldt (Starbreeze Studios)
diff --git a/VERSION b/VERSION
index 2b86357ec..ccbfd57bb 100644
--- a/VERSION
+++ b/VERSION
@@ -1,3 +1,3 @@
-Bullet Collision Detection and Physics Library version 2.54
+Bullet Collision Detection and Physics Library version 2.55
 http://bullet.sourceforge.net
 
diff --git a/configure b/configure
index 934496fed..0c4f33dfa 100755
--- a/configure
+++ b/configure
@@ -1,6 +1,6 @@
 #! /bin/sh
 # Guess values for system-dependent variables and create Makefiles.
-# Generated by GNU Autoconf 2.59 for bullet 2.54.
+# Generated by GNU Autoconf 2.59 for bullet 2.55.
 #
 # Report bugs to <bullet@erwincoumans.com>.
 #
@@ -271,8 +271,8 @@ SHELL=${CONFIG_SHELL-/bin/sh}
 # Identity of this package.
 PACKAGE_NAME='bullet'
 PACKAGE_TARNAME='bullet'
-PACKAGE_VERSION='2.54'
-PACKAGE_STRING='bullet 2.54'
+PACKAGE_VERSION='2.55'
+PACKAGE_STRING='bullet 2.55'
 PACKAGE_BUGREPORT='bullet@erwincoumans.com'
 
 ac_unique_file="mk/jam/build.jam"
@@ -790,7 +790,7 @@ 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 bullet 2.54 to adapt to many kinds of systems.
+\`configure' configures bullet 2.55 to adapt to many kinds of systems.
 
 Usage: $0 [OPTION]... [VAR=VALUE]...
 
@@ -855,7 +855,7 @@ fi
 
 if test -n "$ac_init_help"; then
   case $ac_init_help in
-     short | recursive ) echo "Configuration of bullet 2.54:";;
+     short | recursive ) echo "Configuration of bullet 2.55:";;
    esac
   cat <<\_ACEOF
 
@@ -980,7 +980,7 @@ fi
 test -n "$ac_init_help" && exit 0
 if $ac_init_version; then
   cat <<\_ACEOF
-bullet configure 2.54
+bullet configure 2.55
 generated by GNU Autoconf 2.59
 
 Copyright (C) 2003 Free Software Foundation, Inc.
@@ -994,7 +994,7 @@ cat >&5 <<_ACEOF
 This file contains any messages produced by compilers while
 running configure, to aid debugging if configure makes a mistake.
 
-It was created by bullet $as_me 2.54, which was
+It was created by bullet $as_me 2.55, which was
 generated by GNU Autoconf 2.59.  Invocation command line was
 
   $ $0 $@
@@ -9898,7 +9898,7 @@ cs_jamconfig_text="${cs_jamconfig_text}PACKAGE_NAME ?= \"$PACKAGE_NAME\" ;
 "
     cs_jamconfig_text="${cs_jamconfig_text}PACKAGE_COPYRIGHT ?= \"$PACKAGE_COPYRIGHT\" ;
 "
-    for cs_veritem in 2 54; do
+    for cs_veritem in 2 55; do
 	cs_jamconfig_text="${cs_jamconfig_text}PACKAGE_VERSION_LIST += \"$cs_veritem\" ;
 "
     done
@@ -10275,7 +10275,7 @@ _ASBOX
 } >&5
 cat >&5 <<_CSEOF
 
-This file was extended by bullet $as_me 2.54, which was
+This file was extended by bullet $as_me 2.55, which was
 generated by GNU Autoconf 2.59.  Invocation command line was
 
   CONFIG_FILES    = $CONFIG_FILES
@@ -10338,7 +10338,7 @@ _ACEOF
 
 cat >>$CONFIG_STATUS <<_ACEOF
 ac_cs_version="\\
-bullet config.status 2.54
+bullet config.status 2.55
 configured by $0, generated by GNU Autoconf 2.59,
   with options \\"`echo "$ac_configure_args" | sed 's/[\\""\`\$]/\\\\&/g'`\\"
 
diff --git a/configure.ac b/configure.ac
index 439f76e3d..74b132754 100644
--- a/configure.ac
+++ b/configure.ac
@@ -9,7 +9,7 @@ AC_PREREQ([2.54])
 #----------------------------------------------------------------------------
 AC_INIT(
     [bullet],
-    [2.54],
+    [2.55],
     [bullet@erwincoumans.com])
 CS_PACKAGEINFO(
     [Bullet Continuous Collision Detection and Physics Library],