diff --git a/requirements.txt b/requirements.txt
index 1aaf58d..89e43ee 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 beautifulsoup4==4.6.0
 bpe==1.0
-nltk==3.4.1
+nltk==3.4.5
 numpy==1.14.5
 pandas==0.24.2
 protobuf==3.7.1