diff --git a/CLOBBER b/CLOBBER
index ab48dbb4964..d4cdfaff33d 100644
--- a/CLOBBER
+++ b/CLOBBER
@@ -22,4 +22,4 @@
 # changes to stick? As of bug 928195, this shouldn't be necessary! Please
 # don't change CLOBBER for WebIDL changes any more.
 
-Bug 1155494 seems to need a clobber to pick up a change the ipdl parser.
+Merge day clobber
\ No newline at end of file
diff --git a/b2g/confvars.sh b/b2g/confvars.sh
index 00d14c87ad2..1bfb9c75eb7 100644
--- a/b2g/confvars.sh
+++ b/b2g/confvars.sh
@@ -5,7 +5,7 @@
 MOZ_APP_BASENAME=B2G
 MOZ_APP_VENDOR=Mozilla
 
-MOZ_APP_VERSION=40.0a1
+MOZ_APP_VERSION=41.0a1
 MOZ_APP_UA_NAME=Firefox
 
 MOZ_UA_OS_AGNOSTIC=1
diff --git a/browser/config/version.txt b/browser/config/version.txt
index 5d63a2b3ba5..288a167298d 100644
--- a/browser/config/version.txt
+++ b/browser/config/version.txt
@@ -1 +1 @@
-40.0a1
+41.0a1
diff --git a/config/milestone.txt b/config/milestone.txt
index 5ca2a075bb6..9cb4865049d 100644
--- a/config/milestone.txt
+++ b/config/milestone.txt
@@ -10,4 +10,4 @@
 # hardcoded milestones in the tree from these two files.
 #--------------------------------------------------------
 
-40.0a1
+41.0a1
diff --git a/mobile/android/confvars.sh b/mobile/android/confvars.sh
index da1ed1ecb63..dba5f3893bb 100644
--- a/mobile/android/confvars.sh
+++ b/mobile/android/confvars.sh
@@ -5,7 +5,7 @@
 MOZ_APP_BASENAME=Fennec
 MOZ_APP_VENDOR=Mozilla
 
-MOZ_APP_VERSION=40.0a1
+MOZ_APP_VERSION=41.0a1
 MOZ_APP_UA_NAME=Firefox
 
 MOZ_BRANDING_DIRECTORY=mobile/android/branding/unofficial
diff --git a/services/sync/Makefile.in b/services/sync/Makefile.in
index 042872ed4b0..ccdabab9511 100644
--- a/services/sync/Makefile.in
+++ b/services/sync/Makefile.in
@@ -3,7 +3,7 @@
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 # Definitions used by constants.js.
-weave_version := 1.42.0
+weave_version := 1.43.0
 weave_id      := {340c2bbc-ce74-4362-90b5-7c26312808ef}
 
 # Preprocess files.
diff --git a/xpcom/components/Module.h b/xpcom/components/Module.h
index ea5081ad887..fb2b3931f8d 100644
--- a/xpcom/components/Module.h
+++ b/xpcom/components/Module.h
@@ -22,7 +22,7 @@ namespace mozilla {
  */
 struct Module
 {
-  static const unsigned int kVersion = 40;
+  static const unsigned int kVersion = 41;
 
   struct CIDEntry;