diff --git a/requirements/common.txt b/requirements/common.txt
index dee253fe0..94e414fb2 100644
--- a/requirements/common.txt
+++ b/requirements/common.txt
@@ -44,7 +44,7 @@ keepalive==0.5
 kombu==4.6.4
 lxml==4.3.4
 Markdown==3.1.1
-nltk==3.4.5
+nltk==3.6.5
 nose==1.3.7
 numpy==1.16.4
 pandas==0.24.2