diff --git a/requirements.txt b/requirements.txt
index 396731a..ff906eb 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-nltk==3.4.5
+nltk==3.9.4
 numpy==1.16.4
 Keras==2.2.4
 gensim==3.7.3