diff --git a/pyproject.toml b/pyproject.toml
index 25e65b8..a10824a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -59,7 +59,7 @@ dev = [
 ]
 doc = [
     "mkdocs ==1.4.2",
-    "mkdocs-material ==8.5.11",
+    "mkdocs-material ==9.1.8",
     "markdown ==3.2.1",
     "markdown-include ==0.8.1",
     "mkdocs-markdownextradata-plugin ==0.2.5",