diff --git a/e-reading-server/requirements.txt b/e-reading-server/requirements.txt
index 6a108ad..8959eba 100644
--- a/e-reading-server/requirements.txt
+++ b/e-reading-server/requirements.txt
@@ -18,7 +18,7 @@ lazy-object-proxy==1.3.1
 lint==1.2.1
 maya==0.6.1
 mccabe==0.6.1
-nltk==3.4
+nltk==3.4.5
 pendulum==2.0.4
 psycopg2==2.7.7
 psycopg2-binary==2.7.7