diff --git a/docker/requirements.txt b/docker/requirements.txt
index 4888044..b970ba6 100644
--- a/docker/requirements.txt
+++ b/docker/requirements.txt
@@ -3,7 +3,7 @@ torchvision==0.4.2
 numpy==1.17.2
 scipy==1.3.3
 scikit-learn==0.22
-nltk==3.4.5
+nltk==3.6.6
 lxml==4.6.2
 beautifulsoup4==4.8.0
 pandas==0.24.2