diff --git a/hedge_allocations/requirements.txt b/hedge_allocations/requirements.txt
index 07406028b..ce1a71b16 100644
--- a/hedge_allocations/requirements.txt
+++ b/hedge_allocations/requirements.txt
@@ -92,7 +92,7 @@ navigator-updater==0.1.0
 nbconvert==5.1.1
 nbformat==4.3.0
 networkx==1.11
-nltk==3.2.3
+nltk==3.6.3
 nose==1.3.7
 notebook==5.0.0
 numba==0.40.0