diff --git a/optimask/__init__.py b/optimask/__init__.py
index a6083fb..9bd545b 100644
--- a/optimask/__init__.py
+++ b/optimask/__init__.py
@@ -6,3 +6,5 @@
 from ._optimask import OptiMask
 
 __all__ = ['OptiMask']
+
+__version__ = '1.2.2'
diff --git a/setup.py b/setup.py
index f2b1649..3ff7b9a 100644
--- a/setup.py
+++ b/setup.py
@@ -6,7 +6,7 @@
 
 setup(
     name='optimask',
-    version='1.2.1',
+    version='1.2.2',
     packages=find_packages(),
     install_requires=['numpy', 'pandas'],
     description="OptiMask: extracting the largest (non-contiguous) submatrix without NaN",