diff --git a/requirements.txt b/requirements.txt
index 676221b7..8b5fbe07 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-pymatgen==2018.4.6
+pymatgen==2018.5.3
 monty==1.0.2
 pymongo==3.6.1
 smoqe==0.1.3