diff --git a/requirements.txt b/requirements.txt
index df1dc60..41697bd 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -24,7 +24,7 @@ jsonschema==2.6.0
 lxml==4.3.3
 MarkupSafe==1.1.1
 murmurhash==1.0.2
-nltk==3.4.1
+nltk==3.4.5
 numpy==1.16.3
 plac==0.9.6
 preshed==2.0.1