diff --git a/requirements.txt b/requirements.txt
index d9edbd1..e7ac1d8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,7 +8,7 @@ docutils==0.14
 gensim==3.7.1
 idna==2.8
 jmespath==0.9.3
-nltk==3.4
+nltk==3.4.5
 numexpr==2.6.9
 numpy==1.16.1+mkl
 pandas==0.24.1