diff --git a/doc/requirements-rtd.txt b/doc/requirements-rtd.txt
index 5245aa83a..22c3d2baa 100644
--- a/doc/requirements-rtd.txt
+++ b/doc/requirements-rtd.txt
@@ -2,7 +2,7 @@ Pygments==2.3.1
 setuptools==41.0.1
 docutils==0.14
 mock==1.0.1
-pillow==5.4.1
+pillow==9.3.0
 alabaster>=0.7,<0.8,!=0.7.5
 commonmark==0.8.1
 recommonmark==0.5.0