diff --git a/Makefile b/Makefile
index 5bf33cc..9c9284e 100644
--- a/Makefile
+++ b/Makefile
@@ -14,7 +14,7 @@
 #
 TMP        ?= /tmp
 DIST_PREFIX = ${TMP}
-VERSION     = 4.2.1
+VERSION     = 4.2.1+dev
 DEBVERSION  = $(shell echo $(VERSION)|sed 's/\(rc\|pre\|beta\|alpha\)/~\1/')
 BASE        = xen-tools
 VCS         = $(shell if git ls-files > /dev/null; then echo git; \
diff --git a/bin/xen-create-image b/bin/xen-create-image
index 888a1b7..af4d4f5 100755
--- a/bin/xen-create-image
+++ b/bin/xen-create-image
@@ -806,7 +806,7 @@ my $FAIL = 0;
 #
 # Release number.
 #
-my $RELEASE = '4.2.1';
+my $RELEASE = '4.2.1+dev';
 
 
 #
diff --git a/bin/xen-create-nfs b/bin/xen-create-nfs
index c0d9cb4..6969c74 100755
--- a/bin/xen-create-nfs
+++ b/bin/xen-create-nfs
@@ -131,7 +131,7 @@ $CONFIG{ 'template' } = '/etc/xen-tools/xm-nfs.tmpl';
 #
 # Release number.
 #
-my $RELEASE = '4.2.1';
+my $RELEASE = '4.2.1+dev';
 
 
 # store version number away.
diff --git a/bin/xen-delete-image b/bin/xen-delete-image
index 35f4304..da58417 100755
--- a/bin/xen-delete-image
+++ b/bin/xen-delete-image
@@ -171,7 +171,7 @@ my %CONFIG;
 #
 # Release number.
 #
-my $RELEASE = '4.2.1';
+my $RELEASE = '4.2.1+dev';
 
 
 
diff --git a/bin/xen-list-images b/bin/xen-list-images
index b61856f..d54abf4 100755
--- a/bin/xen-list-images
+++ b/bin/xen-list-images
@@ -101,7 +101,7 @@ $CONFIG{ 'prefix' } = "/etc/xen";
 #
 # Release number.
 #
-my $RELEASE = '4.2.1';
+my $RELEASE = '4.2.1+dev';
 
 
 
diff --git a/bin/xen-resize-guest b/bin/xen-resize-guest
index a59be55..95acf56 100755
--- a/bin/xen-resize-guest
+++ b/bin/xen-resize-guest
@@ -116,7 +116,7 @@ my %CONFIG;
 #
 # Release number.
 #
-my $RELEASE = '4.2.1';
+my $RELEASE = '4.2.1+dev';
 
 
 
diff --git a/bin/xen-update-image b/bin/xen-update-image
index be5485e..004ee81 100755
--- a/bin/xen-update-image
+++ b/bin/xen-update-image
@@ -120,7 +120,7 @@ my %CONFIG;
 #
 # Release number.
 #
-my $RELEASE = '4.2.1';
+my $RELEASE = '4.2.1+dev';
 
 
 #
diff --git a/bin/xt-create-xen-config b/bin/xt-create-xen-config
index 2ee1150..1cdcefb 100755
--- a/bin/xt-create-xen-config
+++ b/bin/xt-create-xen-config
@@ -156,7 +156,7 @@ $CONFIG{ 'extension' } = '.cfg';
 #
 # Release number.
 #
-my $RELEASE = '4.2.1';
+my $RELEASE = '4.2.1+dev';
 
 
 
diff --git a/bin/xt-customize-image b/bin/xt-customize-image
index 9f1d627..c65ac59 100755
--- a/bin/xt-customize-image
+++ b/bin/xt-customize-image
@@ -98,7 +98,7 @@ my %CONFIG;
 #
 # Release number.
 #
-my $RELEASE = '4.2.1';
+my $RELEASE = '4.2.1+dev';
 
 
 
diff --git a/bin/xt-guess-suite-and-mirror b/bin/xt-guess-suite-and-mirror
index 67aae32..4e437e1 100755
--- a/bin/xt-guess-suite-and-mirror
+++ b/bin/xt-guess-suite-and-mirror
@@ -80,7 +80,7 @@ use strict;
 #
 # Release number.
 #
-my $RELEASE = '4.2.1';
+my $RELEASE = '4.2.1+dev';
 
 # Init
 my $mirror = '';
diff --git a/bin/xt-install-image b/bin/xt-install-image
index e00d2dd..cdac40a 100755
--- a/bin/xt-install-image
+++ b/bin/xt-install-image
@@ -117,7 +117,7 @@ my %CONFIG;
 #
 # Release number.
 #
-my $RELEASE = '4.2.1';
+my $RELEASE = '4.2.1+dev';
 
 
 #
diff --git a/debian/changelog b/debian/changelog
index aee0031..ea73ec4 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,9 @@
+xen-tools (4.2.1+dev-1) UNRELEASED; urgency=low
+
+  * New upstream snapshot
+
+ -- Axel Beckert <abe@debian.org>  Thu, 17 Mar 2011 02:56:41 +0100
+
 xen-tools (4.2.1-1) unstable; urgency=low
 
   * New upstream release