diff --git a/.github/workflows/publish-website.yml b/.github/workflows/publish-website.yml
index 78b36798..ac936663 100644
--- a/.github/workflows/publish-website.yml
+++ b/.github/workflows/publish-website.yml
@@ -9,7 +9,7 @@ on:
 jobs:
   publish:
     name: Publish to GitHub Pages
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
 
     steps:
       - uses: actions/checkout@v3
diff --git a/.github/workflows/validate-website.yml b/.github/workflows/validate-website.yml
index f94c7cd2..2972cbe4 100644
--- a/.github/workflows/validate-website.yml
+++ b/.github/workflows/validate-website.yml
@@ -5,7 +5,7 @@ on: [push, pull_request, workflow_dispatch]
 jobs:
   build:
     name: Build
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
 
     steps:
       - uses: actions/checkout@v3