diff --git a/requirements.txt b/requirements.txt
index f6af95b..822586c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -19,7 +19,7 @@ kiwisolver==1.1.0
 Markdown==3.1.1
 matplotlib==3.0.3
 networkx==2.3
-nltk==3.4.3
+nltk==3.4.5
 numpy==1.16.4
 Pillow==6.2.0
 pkg-resources==0.0.0