diff --git a/nlp/requirements.txt b/nlp/requirements.txt
index 7b8e643..af1ddfb 100644
--- a/nlp/requirements.txt
+++ b/nlp/requirements.txt
@@ -62,7 +62,7 @@ nbconvert==5.4.1
 nbformat==4.4.0
 netifaces==0.10.4
 networkx==2.3
-nltk==3.4
+nltk==3.4.5
 notebook==5.7.8
 numexpr==2.6.4
 numpy==1.16.2