diff --git a/requirements.txt b/requirements.txt
index dca74b3..7e30953 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,4 +8,4 @@ torchvision===0.6.1
 #torchvision===0.7.0 -f https://download.pytorch.org/whl/torch_stable.html
 transformers==3.4.0
 azure-search-documents==11.0.0
-nltk==3.5
+nltk==3.6.5