diff --git a/requirements.txt b/requirements.txt
index 6879f90..150021f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,4 +8,4 @@ scikit-learn==0.20.4
 tqdm==4.28.1
 click==6.7
 numpy==1.16.1
-nltk==3.4.5
+nltk==3.8.1