diff --git a/Project.toml b/Project.toml
index bc4bee2..970abdb 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,7 +1,7 @@
 name = "LeafGasExchange"
 uuid = "eed59905-05f1-464e-afba-94c39a4505fd"
 authors = ["Kyungdahm Yun <tomyun@gmail.com>"]
-version = "0.1.7"
+version = "0.1.8-DEV"
 
 [deps]
 Cropbox = "a904b226-abf1-11e9-2713-059ba252a964"