diff --git a/docs/rtd-requirements.txt b/docs/rtd-requirements.txt
index e2ea433..1589aa5 100644
--- a/docs/rtd-requirements.txt
+++ b/docs/rtd-requirements.txt
@@ -10,7 +10,7 @@ MarkupSafe==0.23
 Missing==2.13.1
 MultiMapping==2.13.0
 Persistence==2.13.2
-Pillow==2.7.0
+Pillow==9.0.1
 Plone==4.3.5
 Products.ATContentTypes==2.1.15
 Products.ATReferenceBrowserWidget==3.0