diff --git a/Installation/include/CGAL/version.h b/Installation/include/CGAL/version.h
index e249c01baac..fe15f62737a 100644
--- a/Installation/include/CGAL/version.h
+++ b/Installation/include/CGAL/version.h
@@ -25,8 +25,8 @@
 #ifndef CGAL_VERSION_H
 #define CGAL_VERSION_H
 
-#define CGAL_VERSION 4.12
-#define CGAL_VERSION_NR 1041201000
+#define CGAL_VERSION 4.13-dev
+#define CGAL_VERSION_NR 1041300000
 #define CGAL_SVN_REVISION 99999
 #define CGAL_GIT_HASH abcdef
 #define CGAL_RELEASE_DATE 20180425
diff --git a/Maintenance/release_building/MINOR_NUMBER b/Maintenance/release_building/MINOR_NUMBER
index 48082f72f08..b1bd38b62a0 100644
--- a/Maintenance/release_building/MINOR_NUMBER
+++ b/Maintenance/release_building/MINOR_NUMBER
@@ -1 +1 @@
-12
+13
diff --git a/Maintenance/release_building/public_release_name b/Maintenance/release_building/public_release_name
index 4c54f8f5053..7f8ff322df2 100644
--- a/Maintenance/release_building/public_release_name
+++ b/Maintenance/release_building/public_release_name
@@ -1 +1 @@
-CGAL-4.12
+CGAL-4.13-dev