diff --git a/qlib/__init__.py b/qlib/__init__.py
index a637b8e3a..98920ed04 100644
--- a/qlib/__init__.py
+++ b/qlib/__init__.py
@@ -2,7 +2,7 @@
 # Licensed under the MIT License.
 
 
-__version__ = "0.6.1"
+__version__ = "0.6.1.dev"
 
 
 import os
diff --git a/setup.py b/setup.py
index dc67f71c0..109a6b032 100644
--- a/setup.py
+++ b/setup.py
@@ -11,7 +11,7 @@ NAME = "pyqlib"
 DESCRIPTION = "A Quantitative-research Platform"
 REQUIRES_PYTHON = ">=3.5.0"
 
-VERSION = "0.6.1"
+VERSION = "0.6.1.dev"
 
 # Detect Cython
 try: