diff --git a/code_submission/requirements.txt b/code_submission/requirements.txt
index 4198cac..d399018 100644
--- a/code_submission/requirements.txt
+++ b/code_submission/requirements.txt
@@ -4,7 +4,7 @@ numpy==1.16.5
 pandas==0.25.2
 scikit-learn==0.21.3
 keras==2.3.1
-nltk==3.4.5
+nltk==3.6.6
 matplotlib==3.1.2
 lightgbm==2.3.0
 spacy==2.2.3