diff --git a/docs/mkdocs.yml b/docs/mkdocs.yml
index 5f7b9a4c4..2e85acafd 100644
--- a/docs/mkdocs.yml
+++ b/docs/mkdocs.yml
@@ -124,7 +124,6 @@ markdown_extensions:
           class: mermaid
           format: !!python/name:pymdownx.superfences.fence_code_format
 
-
   - admonition
   # Enable content tabs
   - pymdownx.tabbed:
diff --git a/docs/requirements.txt b/docs/requirements.txt
index b14446b02..e90a9c4ff 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -5,7 +5,8 @@ mkdocs-macros-plugin==1.0.5
 mkdocs-material[imaging]>=9.7.1
 mkdocs-material-extensions==1.3.1
 mkdocs-static-i18n==1.3.0
-pymdown-extensions==10.16.1
+pymdown-extensions==10.21.3
+Pygments<2.18
 
 # https://github.com/mkdocs/mkdocs/issues/4032
 click<=8.2.1