diff --git a/requirements.txt b/requirements.txt
index 2345c0a4b..b701da82a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -9,7 +9,7 @@ six==1.12.0
 pybtex==0.22.2
 ruamel.yaml==0.16.5
 pandas==0.25.0
-pymatgen==2019.8.23
+pymatgen==2019.8.14
 custodian==2019.2.10
 networkx==2.3
-pydash==4.7.5
\ No newline at end of file
+pydash==4.7.5