diff --git a/requirements.txt b/requirements.txt
index 2c29b714..ed2923b7 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,8 +2,9 @@
 Markdown
 # Extensions
 markdown-checklist
+pymdown-extensions==4.11
 fontawesome-markdown
-mkdocs-material>=3
+mkdocs-material==4.1.2
 markdown-blockdiag>=0.3.0
 markdown-i18n>=3
 pygments