diff --git a/docs/requirements.txt b/docs/requirements.txt
index 1446baf1..04e96274 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,9 +1,9 @@
-mkdocs==1.3.1
-mkdocs-material==8.3.9
-pymdown-extensions==9.5
+mkdocs==1.4.2
+mkdocs-material==9.0.11
+pymdown-extensions==9.9.2
 mkdocs-git-revision-date-localized-plugin==1.1.0
 mkdocs-awesome-pages-plugin==2.8.0
 mdx_truly_sane_lists==1.3 # https://github.com/radude/mdx_truly_sane_lists
-mkdocs-include-markdown-plugin==3.6.1 # https://github.com/mondeja/mkdocs-include-markdown-plugin
+mkdocs-include-markdown-plugin==4.0.3 # https://github.com/mondeja/mkdocs-include-markdown-plugin
 mike==1.1.2 # versioned docs: https://github.com/jimporter/mike