diff --git a/pyaer/__about__.py b/pyaer/__about__.py
index 49dc69d..8790941 100644
--- a/pyaer/__about__.py
+++ b/pyaer/__about__.py
@@ -1,7 +1,7 @@
 """About page."""
 __all__ = ["__version__", "__author__", "__author_email__", "__url__"]
 
-__version__ = "0.2.7"
+__version__ = "0.2.7a0"
 __author__ = "Yuhuang Hu"
 __author_email__ = "duguyue100@gmail.com"
 __url__ = "https://github.com/duguyue100/pyaer"