diff --git a/app/requirements.txt b/app/requirements.txt
index c8718f4..e641010 100644
--- a/app/requirements.txt
+++ b/app/requirements.txt
@@ -13,7 +13,7 @@ jsonschema==3.0.1
 jupyter-core==4.4.0
 MarkupSafe==1.1.1
 nbformat==4.4.0
-nltk==3.4.1
+nltk==3.4.5
 numpy==1.16.2
 pandas==0.24.2
 plotly==3.8.0