diff --git a/requirements.txt b/requirements.txt
index f7e9fe7..0770d54 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 gensim==3.2.0
-nltk==3.3
+nltk==3.4.5
 Babel==2.5.3
 bloom-filter==1.3
 tensorflow-gpu==1.12.0