diff --git a/requirements.txt b/requirements.txt
index 94ab729..711ef58 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,7 +2,7 @@ beautifulsoup4==4.6.0
 gensim==3.4.0
 lxml==4.1.1
 matplotlib==2.1.2
-nltk==3.2.5
+nltk==3.4.5
 nose==1.3.7
 numba==0.36.2
 numexpr==2.6.4