diff --git a/pip-sample/requirements.txt b/pip-sample/requirements.txt
index f4293304..42a79a37 100644
--- a/pip-sample/requirements.txt
+++ b/pip-sample/requirements.txt
@@ -27,7 +27,7 @@ matplotlib==2.2.2
 mistune==0.8.3
 nbconvert==5.4.0
 nbformat==4.4.0
-nltk==3.3
+nltk==3.8.2
 notebook==5.7.0
 numpy==1.21.5
 oauthlib==2.1.0