diff --git a/mkdocs.yml b/mkdocs.yml
index 417f9eebc..eb9711b94 100755
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -160,7 +160,8 @@ markdown_extensions:
         - name: mermaid
           class: mermaid-experimental
           format: !!python/name:pymdownx.superfences.fence_code_format
-  - pymdownx.tabbed
+  - pymdownx.tabbed:
+      alternate_style: true
   - pymdownx.tasklist:
       custom_checkbox: true
   - pymdownx.tilde
diff --git a/requirements.txt b/requirements.txt
index ac122f735..ff1939040 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -22,5 +22,5 @@
 mkdocs>=1.2.2
 Pygments>=2.4
 markdown>=3.2
-pymdown-extensions>=8.2
+pymdown-extensions>=9.0
 mkdocs-material-extensions>=1.0