diff --git a/tensor_embeddings/requirements.txt b/tensor_embeddings/requirements.txt
index 439002a..ea3297d 100644
--- a/tensor_embeddings/requirements.txt
+++ b/tensor_embeddings/requirements.txt
@@ -8,7 +8,7 @@ docutils==0.14
 gensim==3.6.0
 idna==2.7
 jmespath==0.9.3
-nltk==3.4
+nltk==3.4.5
 numpy==1.15.4
 python-dateutil==2.7.5
 requests==2.20.1