diff --git a/requirements.txt b/requirements.txt
index 87ae8208..b4a696f7 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,3 +6,4 @@ requests-futures>=1.0.0
 stem>=1.8.0 
 torrequest>=0.1.0
 pandas>=1.0.0
+openpyxl<=2.0.0