diff --git a/.github/workflows/deploy_mkdocs.yml b/.github/workflows/deploy_mkdocs.yml
index 4e7114a..95e8679 100644
--- a/.github/workflows/deploy_mkdocs.yml
+++ b/.github/workflows/deploy_mkdocs.yml
@@ -7,12 +7,12 @@ on:
 jobs:
   build:
     name: Deploy docs
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     steps:
       - name: Checkout master
         uses: actions/checkout@v1
 
       - name: Deploy docs
-        uses: mhausenblas/mkdocs-deploy-gh-pages@nomaterial
+        uses: mhausenblas/mkdocs-deploy-gh-pages@1.26
         env:
           GITHUB_TOKEN: ${{ secrets.MKDOCS_ACTION_TOKEN }}