diff --git a/b2g/confvars.sh b/b2g/confvars.sh
index ae91b669a4e2..d8ce0a26bb3c 100644
--- a/b2g/confvars.sh
+++ b/b2g/confvars.sh
@@ -5,7 +5,7 @@
 MOZ_APP_BASENAME=B2G
 MOZ_APP_VENDOR=Mozilla
 
-MOZ_APP_VERSION=27.0a1
+MOZ_APP_VERSION=28.0a1
 MOZ_APP_UA_NAME=Firefox
 
 MOZ_UA_OS_AGNOSTIC=1
diff --git a/browser/config/version.txt b/browser/config/version.txt
index d4cc67689ea4..70bb3e86ee94 100644
--- a/browser/config/version.txt
+++ b/browser/config/version.txt
@@ -1 +1 @@
-27.0a1
+28.0a1
diff --git a/config/milestone.txt b/config/milestone.txt
index 970ef7956a88..132ff5fe00ab 100644
--- a/config/milestone.txt
+++ b/config/milestone.txt
@@ -10,4 +10,4 @@
 # hardcoded milestones in the tree from these two files.
 #--------------------------------------------------------
 
-27.0a1
+28.0a1
diff --git a/js/src/config/milestone.txt b/js/src/config/milestone.txt
index 970ef7956a88..132ff5fe00ab 100644
--- a/js/src/config/milestone.txt
+++ b/js/src/config/milestone.txt
@@ -10,4 +10,4 @@
 # hardcoded milestones in the tree from these two files.
 #--------------------------------------------------------
 
-27.0a1
+28.0a1
diff --git a/mobile/android/confvars.sh b/mobile/android/confvars.sh
index c59162943334..ee3eb5841ffa 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=27.0a1
+MOZ_APP_VERSION=28.0a1
 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 555aec3e3904..494c66de08c5 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 := 1.29.0
+weave_version := 1.30.0
 weave_id      := {340c2bbc-ce74-4362-90b5-7c26312808ef}
 
 # Preprocess files.
diff --git a/xpcom/components/Module.h b/xpcom/components/Module.h
index 11cb2bb0765c..27449291b13e 100644
--- a/xpcom/components/Module.h
+++ b/xpcom/components/Module.h
@@ -21,7 +21,7 @@ namespace mozilla {
  */
 struct Module
 {
-  static const unsigned int kVersion = 27;
+  static const unsigned int kVersion = 28;
 
   struct CIDEntry;