diff --git a/project.clj b/project.clj
index 0ff6bf4..e5d5315 100644
--- a/project.clj
+++ b/project.clj
@@ -1,10 +1,10 @@
-(defproject mw-engine "0.1.2"
+(defproject mw-engine "0.1.3-SNAPSHOT"
   :description "Cellular automaton world builder."
   :url "http://www.journeyman.cc/microworld/"
   :manifest {
              ;; do not reformat this! It is important for the buildall script
              ;; that each of these properties is on a line with nothing else.
-		"build-signature-version" "0.1.2"
+		"build-signature-version" "0.1.3-SNAPSHOT"
 		"build-signature-user" "Simon Brooke"
 		"build-signature-email" "simon@journeyman.cc"
 		"build-signature-timestamp" "2014-07-27 11:54:52+01:00"