diff --git a/NEWS b/NEWS
index 277178a3b..56b7760e7 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,7 @@
+New in spot 2.3.5.dev (not yet released)
+
+  Nothing yet.
+
 New in spot 2.3.5 (2017-06-22)
 
   Bugs fixed:
diff --git a/configure.ac b/configure.ac
index d94d434be..b81b820d6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -21,7 +21,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 AC_PREREQ([2.61])
-AC_INIT([spot], [2.3.5], [spot@lrde.epita.fr])
+AC_INIT([spot], [2.3.5.dev], [spot@lrde.epita.fr])
 AC_CONFIG_AUX_DIR([tools])
 AC_CONFIG_MACRO_DIR([m4])
 AM_INIT_AUTOMAKE([1.11 gnu tar-ustar color-tests parallel-tests])