diff --git a/requirements.txt b/requirements.txt
index 377a175..d059d13 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,7 +3,7 @@ certifi==2018.11.29
 chardet==3.0.4
 geotext==0.4.0
 idna==2.8
-nltk==3.4
+nltk==3.4.5
 pbr==5.1.1
 requests==2.21.0
 singledispatch==3.4.0.3