diff --git a/Project.toml b/Project.toml
index 2f9292336..17c8cd3b9 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,7 +1,7 @@
 name = "Kaleido"
 uuid = "caafb194-7e8d-11e9-2724-d5981dd0806d"
 authors = ["Takafumi Arakaki <aka.tkf@gmail.com>"]
-version = "0.2.3"
+version = "0.2.4-DEV"
 
 [deps]
 Requires = "ae029012-a4dd-5104-9daa-d747884805df"