diff --git a/requirements.txt b/requirements.txt
index 49163517..97a44c7d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -13,6 +13,7 @@ itsdangerous==1.1.0
 requests>=2.20.0
 PyMySQL==0.9.2
 gunicorn==19.9.0
+normality==0.6.1  # Pin normality version for dataset
 dataset==1.1.0
 mistune==0.8.4
 netaddr==0.7.19