diff --git a/docs/requirements.txt b/docs/requirements.txt
index f9bf003..c17bcdc 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -423,7 +423,7 @@ pygments==2.19.2
 pylint==4.0.5
 pymatreader==1.2.2
     # via mne
-pymdown-extensions==10.21
+pymdown-extensions==10.21.3
     # via
     #   mkdocs-material
     #   mkdocstrings