diff --git a/python/setup.py b/python/setup.py
index 9692259428fc392fda99403d44396d3d420ea1d0..35c300e82115cf08d1cfb753e9ed66662427c5e4 100644
--- a/python/setup.py
+++ b/python/setup.py
@@ -42,7 +42,7 @@ setup(name='dune.codegen',
                 'dune.codegen.ufl',
                 'dune.codegen.ufl.transformations',
                 ],
-      install_requires=['sympy', 'frozendict', 'pytest', 'pytest-pep8', 'filelock', 'cerberus', 'pyyaml'],
+      install_requires=['sympy', 'frozendict', 'pytest', 'pytest-pep8', 'filelock', 'cerberus', 'pyaml'],
       cmdclass={'test': PyTest},
       entry_points = {
         "console_scripts": [