diff --git a/python/jittor/__init__.py b/python/jittor/__init__.py
index 94181785..70cd1f1f 100644
--- a/python/jittor/__init__.py
+++ b/python/jittor/__init__.py
@@ -9,7 +9,7 @@
 # file 'LICENSE.txt', which is part of this source code package.
 # ***************************************************************
 
-__version__ = '1.3.1.50'
+__version__ = '1.3.1.51'
 from jittor_utils import lock
 with lock.lock_scope():
     ori_int = int