diff --git a/topic_modeling_nmf/requirements.txt b/topic_modeling_nmf/requirements.txt
index fcd0e91..a0c79c2 100644
--- a/topic_modeling_nmf/requirements.txt
+++ b/topic_modeling_nmf/requirements.txt
@@ -4,4 +4,4 @@ scikit-learn==0.22.1
 gensim==3.8.0
 matplotlib==3.1.2
 seaborn==0.9.0
-nltk==3.4.5
\ No newline at end of file
+nltk==3.6.6
\ No newline at end of file