diff --git a/requirements.txt b/requirements.txt
index ce25ac6..a158c90 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,3 @@
-Pillow==4.2.1
+Pillow==9.0.0
 Sphinx==1.6.3
 sphinxcontrib-websupport==1.0.1