diff --git a/requirements.txt b/requirements.txt
index d59e281c..67bd2cb6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,5 +2,5 @@
 # To install them all run 'pip install -r requirements.txt' in the same directory
 
 mkdocs == 1.5.2
-mkdocs-material == 9.2.1
+mkdocs-material == 9.1.21
 mkdocs-redirects == 1.2.1