diff --git a/.github/workflows/gh-pages.yml b/.github/workflows/gh-pages.yml
index c0821349a..8759abea9 100644
--- a/.github/workflows/gh-pages.yml
+++ b/.github/workflows/gh-pages.yml
@@ -16,7 +16,7 @@ jobs:
 
       - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 2.7
+          ruby-version: '3.3'
 
       - run: gem install asciidoctor rouge
 
diff --git a/.github/workflows/htmltest.yml b/.github/workflows/htmltest.yml
index 393b7e5b6..e4ddea488 100644
--- a/.github/workflows/htmltest.yml
+++ b/.github/workflows/htmltest.yml
@@ -14,7 +14,7 @@ jobs:
 
       - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: '2.7'
+          ruby-version: '3.3'
 
       - name: Install build dependencies
         run: |