diff --git a/requirements.txt b/requirements.txt
index a33d1bf..774b453 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -12,7 +12,7 @@ joblib==0.13.0
 kiwisolver==1.1.0
 matplotlib==3.1.1
 networkx==2.2
-nltk==3.4
+nltk==3.4.5
 numpy==1.15.4
 pandas==0.23.3
 pkg-resources==0.0.0