diff --git a/docs/requirements.txt b/docs/requirements.txt
index 5f87dce1..acd19d3d 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,4 +1,5 @@
 sphinx-gallery==0.14.0
+pillow==10.0.1
 sphinxcontrib-bibtex==2.6.1
 sphinx==5.3.0
 sphinx-design==0.3.0