diff --git a/requirements.txt b/requirements.txt
index 7c88f097f..f3d6c8123 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,7 +2,7 @@ pandas==0.23.4
 requests==2.20.1
 scikit-learn==0.20.0
 scipy==1.1.0
-nltk==3.2.5 # pyup: ignore
+nltk==3.4.5 # pyup: ignore
 pytest==3.10.1
 Elasticsearch==6.3.1
 gensim==3.6.0 # pyup: ignore