diff --git a/requirements.txt b/requirements.txt
index 3536074..e4bc48d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,7 +6,7 @@ kiwisolver==1.3.1
 matplotlib==3.4.1
 networkx==2.5.1
 numpy==1.20.2
-Pillow==8.2.0
+Pillow==9.0.0
 PuLP==2.4
 pyparsing==2.4.7
 python-dateutil==2.8.1