diff --git a/Dockerfile b/Dockerfile
index 4df64a1b..94377184 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM squidfunk/mkdocs-material:9.1.19
+FROM squidfunk/mkdocs-material:9.1.21
 
 EXPOSE 8000