--- a/b2g/confvars.sh
+++ b/b2g/confvars.sh
@@ -1,16 +1,16 @@
 # This Source Code Form is subject to the terms of the Mozilla Public
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 MOZ_APP_BASENAME=B2G
 MOZ_APP_VENDOR=Mozilla
 
-MOZ_APP_VERSION=20.0a1
+MOZ_APP_VERSION=21.0a1
 MOZ_APP_UA_NAME=Firefox
 
 MOZ_UA_OS_AGNOSTIC=1
 
 MOZ_B2G_VERSION=1.0.0-prerelease
 MOZ_B2G_OS_NAME=Boot2Gecko
 
 MOZ_BRANDING_DIRECTORY=b2g/branding/unofficial

--- a/browser/config/version.txt
+++ b/browser/config/version.txt
@@ -1,1 +1,1 @@
-20.0a1
+21.0a1

--- a/config/milestone.txt
+++ b/config/milestone.txt
@@ -5,9 +5,9 @@
 #    x.x.x.x
 #    x.x.x+
 #
 # Referenced by milestone.pl.
 # Hopefully I'll be able to automate replacement of *all*
 # hardcoded milestones in the tree from these two files.
 #--------------------------------------------------------
 
-20.0a1
+21.0a1

--- a/js/src/config/milestone.txt
+++ b/js/src/config/milestone.txt
@@ -5,9 +5,9 @@
 #    x.x.x.x
 #    x.x.x+
 #
 # Referenced by milestone.pl.
 # Hopefully I'll be able to automate replacement of *all*
 # hardcoded milestones in the tree from these two files.
 #--------------------------------------------------------
 
-20.0a1
+21.0a1

--- a/mobile/android/confvars.sh
+++ b/mobile/android/confvars.sh
@@ -1,16 +1,16 @@
 # This Source Code Form is subject to the terms of the Mozilla Public
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 MOZ_APP_BASENAME=Fennec
 MOZ_APP_VENDOR=Mozilla
 
-MOZ_APP_VERSION=20.0a1
+MOZ_APP_VERSION=21.0a1
 MOZ_APP_UA_NAME=Firefox
 
 MOZ_BRANDING_DIRECTORY=mobile/android/branding/unofficial
 MOZ_OFFICIAL_BRANDING_DIRECTORY=mobile/android/branding/official
 # MOZ_APP_DISPLAYNAME is set by branding/configure.sh
 
 MOZ_SAFE_BROWSING=1
 

--- a/mobile/xul/confvars.sh
+++ b/mobile/xul/confvars.sh
@@ -1,16 +1,16 @@
 # This Source Code Form is subject to the terms of the Mozilla Public
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 MOZ_APP_BASENAME=Fennec
 MOZ_APP_VENDOR=Mozilla
 
-MOZ_APP_VERSION=20.0a1
+MOZ_APP_VERSION=21.0a1
 
 MOZ_BRANDING_DIRECTORY=mobile/xul/branding/unofficial
 MOZ_OFFICIAL_BRANDING_DIRECTORY=mobile/xul/branding/official
 # MOZ_APP_DISPLAYNAME is set by branding/configure.sh
 
 MOZ_SAFE_BROWSING=
 
 MOZ_SERVICES_COMMON=1

--- a/services/sync/Makefile.in
+++ b/services/sync/Makefile.in
@@ -5,17 +5,17 @@
 DEPTH     := @DEPTH@
 topsrcdir := @top_srcdir@
 srcdir    := @srcdir@
 VPATH     := @srcdir@
 
 include $(DEPTH)/config/autoconf.mk
 
 # Definitions used by constants.js.
-weave_version := 1.22.0
+weave_version := 1.23.0
 weave_id      := {340c2bbc-ce74-4362-90b5-7c26312808ef}
 
 # Preprocess files.
 SYNC_PP := modules/constants.js
 SYNC_PP_FLAGS := \
  -Dweave_version=$(weave_version) \
  -Dweave_id=$(weave_id)
 SYNC_PP_PATH = $(FINAL_TARGET)/modules/services-sync

--- a/xpcom/components/Module.h
+++ b/xpcom/components/Module.h
@@ -16,17 +16,17 @@ namespace mozilla {
 /**
  * A module implements one or more XPCOM components. This structure is used
  * for both binary and script modules, but the registration members
  * (cids/contractids/categoryentries) are unused for modules which are loaded
  * via a module loader.
  */
 struct Module
 {
-  static const unsigned int kVersion = 20;
+  static const unsigned int kVersion = 21;
 
   struct CIDEntry;
 
   typedef already_AddRefed<nsIFactory> (*GetFactoryProcPtr)
     (const Module& module, const CIDEntry& entry);
 
   typedef nsresult (*ConstructorProcPtr)(nsISupports* aOuter,
                                          const nsIID& aIID,