diff --git a/requirements.txt b/requirements.txt
index 73f6cc3..48ffbc4 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 beautifulsoup4
 gensim==1.0.1
-nltk==3.4.5
+nltk==3.9
 sklearn==0.23.2
 numpy
 beautifulsoup4