diff --git a/requirements.txt b/requirements.txt
index 41f5685..1c58706 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-nltk==3.4
+nltk==3.6.6
 numpy==1.16.2
 textblob==0.15.3
 spacy==2.1.6