diff --git a/configure.ac b/configure.ac
index 000ce081d5..08e4ea801f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -12,7 +12,7 @@ AC_PREREQ(2.59)
 # In the SVN trunk, the version should always be the next anticipated release
 # version with the "-pre" suffix.  (We used to use "-SNAPSHOT" but this pushed
 # the size of one file name in the dist tarfile over the 99-char limit.)
-AC_INIT([Protocol Buffers],[2.4.0-pre],[protobuf@googlegroups.com],[protobuf])
+AC_INIT([Protocol Buffers],[2.4.1-pre],[protobuf@googlegroups.com],[protobuf])
 
 
 AC_CONFIG_SRCDIR(src/google/protobuf/message.cc)
diff --git a/java/pom.xml b/java/pom.xml
index ae7a0cb3eb..d1b44c0fa1 100644
--- a/java/pom.xml
+++ b/java/pom.xml
@@ -10,7 +10,7 @@
   </parent>
   <groupId>com.google.protobuf</groupId>
   <artifactId>protobuf-java</artifactId>
-  <version>2.4.0-pre</version>
+  <version>2.4.1-pre</version>
   <packaging>jar</packaging>
   <name>Protocol Buffer Java API</name>
   <description>
diff --git a/python/setup.py b/python/setup.py
index 53e8b4a5fa..77cfdd314a 100755
--- a/python/setup.py
+++ b/python/setup.py
@@ -120,7 +120,7 @@ if __name__ == '__main__':
         library_dirs = [ "../src/.libs" ]))
 
   setup(name = 'protobuf',
-        version = '2.4.0-pre',
+        version = '2.4.1-pre',
         packages = [ 'google' ],
         namespace_packages = [ 'google' ],
         test_suite = 'setup.MakeTestSuite',