diff --git a/NEWS b/NEWS
index 8d1dd68d..c70aba83 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,5 @@
+ncmpcpp-0.6.6 (????-??-??)
+
 ncmpcpp-0.6.5 (2015-07-05)
 
 * Description of mouse wheel usage on volume is now correct.
diff --git a/configure.ac b/configure.ac
index 050044a4..661e5c75 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,7 +1,7 @@
 AC_INIT(configure.ac)
 
 AC_CONFIG_HEADERS(config.h)
-AM_INIT_AUTOMAKE(ncmpcpp, 0.6.5)
+AM_INIT_AUTOMAKE(ncmpcpp, 0.6.6_dev)
 
 AC_PREREQ(2.59)