diff --git a/project/Sbt.scala b/project/Sbt.scala
index 8d922fb1b..09d44f9ab 100644
--- a/project/Sbt.scala
+++ b/project/Sbt.scala
@@ -14,7 +14,7 @@ object Sbt extends Build
 	override lazy val settings = super.settings ++ buildSettings ++ Status.settings
 	def buildSettings = Seq(
 		organization := "org.scala-sbt",
-		version := "0.12.3",
+		version := "0.12.4-M1",
 		publishArtifact in packageDoc := false,
 		scalaVersion := "2.9.2",
 		publishMavenStyle := false,
diff --git a/src/main/conscript/sbt/launchconfig b/src/main/conscript/sbt/launchconfig
index fd2b93932..d76a4d3dd 100644
--- a/src/main/conscript/sbt/launchconfig
+++ b/src/main/conscript/sbt/launchconfig
@@ -4,7 +4,7 @@
 [app]
   org: org.scala-sbt
   name: sbt
-  version: read(sbt.version)[0.12.3]
+  version: read(sbt.version)[0.12.4-M1]
   class: ${sbt.main.class-sbt.xMain}
   components: xsbti
   cross-versioned: true
diff --git a/src/main/conscript/scalas/launchconfig b/src/main/conscript/scalas/launchconfig
index b3899cfee..d394da135 100644
--- a/src/main/conscript/scalas/launchconfig
+++ b/src/main/conscript/scalas/launchconfig
@@ -4,7 +4,7 @@
 [app]
   org: org.scala-sbt
   name: sbt
-  version: 0.12.3
+  version: 0.12.4-M1
   class: sbt.ScriptMain
   components: xsbti
   cross-versioned: true
diff --git a/src/main/conscript/screpl/launchconfig b/src/main/conscript/screpl/launchconfig
index 86567ef35..7e3301455 100644
--- a/src/main/conscript/screpl/launchconfig
+++ b/src/main/conscript/screpl/launchconfig
@@ -4,7 +4,7 @@
 [app]
   org: org.scala-sbt
   name: sbt
-  version: 0.12.3
+  version: 0.12.4-M1
   class: sbt.ConsoleMain
   components: xsbti
   cross-versioned: true
diff --git a/src/sphinx/conf.py b/src/sphinx/conf.py
index 4a6c15f9e..52bf97c1d 100644
--- a/src/sphinx/conf.py
+++ b/src/sphinx/conf.py
@@ -9,7 +9,7 @@ extensions = ['sphinxcontrib.issuetracker', 'sphinx.ext.extlinks', 'howto']
 
 project = 'sbt'
 version = '0.12'
-release = '0.12.3'
+release = '0.12.4'
 
 # General settings