diff --git a/Python3Code/requirements.txt b/Python3Code/requirements.txt
index cd40eeae..a06b53a9 100644
--- a/Python3Code/requirements.txt
+++ b/Python3Code/requirements.txt
@@ -2,7 +2,7 @@ gensim==3.8.1
 inspyred==1.0.1
 joblib==0.14.1
 matplotlib==3.2.1
-nltk==3.4.5
+nltk==3.6.6
 numpy==1.22.3
 pandas==1.0.3
 pyclust==0.2.0