diff --git a/setup.py b/setup.py
index 60a1657..ab08160 100644
--- a/setup.py
+++ b/setup.py
@@ -5,7 +5,7 @@
 
 setuptools.setup(
     name="ncon",
-    version="0.9.0",
+    version="1.0.0",
     author="Markus Hauru",
     author_email="markus@mhauru.org",
     description="Tensor network contraction function for Python 3.",