diff --git a/requirements.txt b/requirements.txt
index e963ed0..796809a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 torch==1.1.0
-nltk==3.4
+nltk==3.4.5
 numpy==1.15.4
 tqdm==4.28.1
 gensim==3.6.0