diff --git a/requirements.txt b/requirements.txt
index c35d1ca..f9b0678 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -10,5 +10,5 @@ requests==2.22.0
 scikit_learn==0.23.2
 emoji==0.6.0
 wordcloud==1.8.0
-nltk==3.5
+nltk==3.6.6
 vaderSentiment==3.3.2