diff --git a/setup.py b/setup.py
index <HASH>..<HASH> 100644
--- a/setup.py
+++ b/setup.py
@@ -17,7 +17,7 @@ setup(
     packages=find_packages(),
     version="0.8.8",
     install_requires=["monty>=0.7.0", "six"],
-    extras_require={"vasp, nwchem, qchem": ["pymatgen>=3.2.0"]},
+    extras_require={"vasp, nwchem, qchem": ["pymatgen>=3.3.1"]},
     package_data={},
     author="Shyue Ping Ong, William Davidson Richards, Stephen Dacek, "
            "Xiaohui Qu",
iFix setup.py as well.