diff --git a/Makefile b/Makefile
index 2418dfb..310f3cd 100644
--- a/Makefile
+++ b/Makefile
@@ -25,7 +25,7 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-VERSION = 2.30
+VERSION = 2.31
 PACKAGE = yubikey-val
 CODE = COPYING Makefile NEWS README ykval-checksum-clients		\
 	ykval-common.php ykval-config.php ykval-db.php ykval-db.sql	\
diff --git a/NEWS b/NEWS
index f6076ed..6690c62 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,5 @@
+* Version 2.31 (unreleased)
+
 * Version 2.30 (released 2015-09-09)
 
   * Refactoring and internal improvements.