diff --git a/requirements.txt b/requirements.txt
index bbd45a5..0fd0bef 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-nltk==3.4
+nltk==3.4.5
 numpy==1.15.4
 pandas==0.23.4
 pytorch-pretrained-bert==0.1.2