diff --git a/requirements.txt b/requirements.txt
index dc82ae2..43b5787 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,7 +7,7 @@ idna==2.8
 joblib==0.13.2
 jsonschema==3.0.1
 murmurhash==1.0.2
-nltk==3.4.3
+nltk==3.4.5
 numpy==1.16.4
 pandas==0.24.2
 plac==0.9.6