diff --git a/Ref_Projects/SDC-P5-master/requirements.txt b/Ref_Projects/SDC-P5-master/requirements.txt
index 45478cbd4..13f59e32d 100644
--- a/Ref_Projects/SDC-P5-master/requirements.txt
+++ b/Ref_Projects/SDC-P5-master/requirements.txt
@@ -78,7 +78,7 @@ nbconvert==4.2.0
 nbformat==4.1.0
 nbpresent==3.0.2
 networkx==1.11
-nltk==3.2.1
+nltk==3.4.5
 nose==1.3.7
 notebook==4.2.3
 numba==0.28.1