diff --git a/requirements.txt b/requirements.txt
index 1df844e..a0fdbc1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,4 +3,4 @@ jupyter-contrib-nbextensions==0.5.1
 yapf==0.27.0
 spacy==2.1.6
 matplotlib==3.3.2
-nltk==3.5
\ No newline at end of file
+nltk==3.9
\ No newline at end of file