diff --git a/requirements.txt b/requirements.txt
index 48b75e8..83297aa 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 gensim==0.13.1
 lxml==3.6.4
-nltk==3.2.1
+nltk==3.4.5
 numpy==1.14.5
 PyICU==1.9.3
 scikit-learn==0.17.1