diff --git a/assignment2/requirements.txt b/assignment2/requirements.txt
index 9ebb465..21afc15 100644
--- a/assignment2/requirements.txt
+++ b/assignment2/requirements.txt
@@ -26,7 +26,7 @@ matplotlib==2.0.0
 mistune==0.7.1
 nbconvert==4.1.0
 nbformat==4.0.1
-nltk==3.2.2
+nltk==3.4.5
 notebook==4.0.6
 numpy==1.12.1
 path.py==8.1.2