diff --git a/Makefile b/Makefile
index 3683a2ca..9f8e52d0 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 RACK_DIR ?= .
-VERSION = 0.6.1
+VERSION = 0.6.1dev
 
 FLAGS += \
 	-Iinclude \