diff --git a/optimask/__init__.py b/optimask/__init__.py
index b865720..5451ce7 100644
--- a/optimask/__init__.py
+++ b/optimask/__init__.py
@@ -7,4 +7,4 @@
 
 __all__ = ['OptiMask']
 
-__version__ = '1.3'
+__version__ = '1.3.1'