diff --git a/sfft/__init__.py b/sfft/__init__.py
index d83cfd3..33f21e4 100644
--- a/sfft/__init__.py
+++ b/sfft/__init__.py
@@ -12,6 +12,7 @@
     from sfft.sfftcore.SFFTSubtract import GeneralSFFTSubtract
 """
 
+__version__ = "1.6.1"
 from .PureCupyCustomizedPacket import PureCupy_Customized_Packet
 from .CustomizedPacket import Customized_Packet
 from .AutoSparsePrep import Auto_SparsePrep