diff --git a/docs/mkdocs/requirements.txt b/docs/mkdocs/requirements.txt
index b397d545d0..0a1fb1d337 100644
--- a/docs/mkdocs/requirements.txt
+++ b/docs/mkdocs/requirements.txt
@@ -27,7 +27,7 @@ mkdocs-material-extensions==1.3
 mkdocs-minify-plugin==0.7.1
 mkdocs-redirects==1.2.1
 mkdocs-simple-hooks==0.1.5
-nltk==3.8.1
+nltk==3.9
 packaging==23.2
 plantuml==0.3.0
 plantuml-markdown==3.9.2