diff --git a/wordcloud_demo/requirements.txt b/wordcloud_demo/requirements.txt
index 8bc10c9..425a98b 100644
--- a/wordcloud_demo/requirements.txt
+++ b/wordcloud_demo/requirements.txt
@@ -50,7 +50,7 @@ olefile==0.44
 pandocfilters==1.4.2
 parso==0.1.1
 pickleshare==0.7.4
-Pillow==4.1.1
+Pillow==9.0.1
 pluggy==0.6.0
 prompt-toolkit==1.0.15
 psutil==5.4.2