diff --git a/deprecated/requirements.txt b/deprecated/requirements.txt
index 16cbfa9..bd3ada4 100644
--- a/deprecated/requirements.txt
+++ b/deprecated/requirements.txt
@@ -46,7 +46,7 @@ matplotlib==2.2.4
 mistune==0.8.4
 nbconvert==5.6.1
 nbformat==4.4.0
-nltk==3.4.3
+nltk==3.4.5
 notebook==5.7.8
 numpy==1.16.4
 oauth==1.0.1