diff --git a/setup.py b/setup.py
index 4f98b168..99f76675 100644
--- a/setup.py
+++ b/setup.py
@@ -32,7 +32,7 @@
                 ]
       },
       install_requires=['numpy>=1.20.0', 'scipy', 'setuptools>=3.3', 'pyyaml',
-                        'ckmutil>=1.1.0', 'wilson>=2.4', 'particle>=0.21.0', 'parton>=0.2.1', ],
+                        'ckmutil>=1.2.0', 'wilson>=2.4', 'particle>=0.21.0', 'parton>=0.2.1', ],
       extras_require={
             'testing': ['nose2'],
             'plotting': ['matplotlib>=2.0'],