diff --git a/NEWS b/NEWS
index 116a085..1f5fdac 100644
--- a/NEWS
+++ b/NEWS
@@ -1,5 +1,7 @@
 pam_yubico NEWS -- History of user-visible changes.             -*- outline -*-
 
+* Version 2.21 (unreleased)
+
 * Version 2.20 (released 2015-09-22)
 
 ** Add cainfo option to allow usage of a cabundle instead of path.
diff --git a/configure.ac b/configure.ac
index b7d3d05..2e36609 100644
--- a/configure.ac
+++ b/configure.ac
@@ -26,7 +26,7 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-AC_INIT([pam_yubico], [2.20], [yubico-devel@googlegroups.com])
+AC_INIT([pam_yubico], [2.21], [yubico-devel@googlegroups.com])
 AC_CONFIG_AUX_DIR([build-aux])
 AC_CONFIG_MACRO_DIR([m4])
 AM_INIT_AUTOMAKE([1.11 foreign -Wall -Werror])