diff --git a/requirements.txt b/requirements.txt
index 797fda1..18a775a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -116,7 +116,7 @@ navigator-updater==0.2.1
 nbconvert==5.5.0
 nbformat==4.4.0
 networkx==2.3
-nltk==3.4.4
+nltk==3.4.5
 nose==1.3.7
 notebook==6.0.0
 numba==0.44.1