diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index f5bcfde..30bcac1 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -14,7 +14,7 @@ jobs:
       - name: Setup Ruby
         uses: ruby/setup-ruby@v1
         with:
-          rubygems: latest
+          rubygems: 3.5.23
           bundler-cache: true
       - name: Run RSpec
         run: bundle exec rake spec
diff --git a/.github/workflows/pull_request.yml b/.github/workflows/pull_request.yml
index e66e81b..a4e0148 100644
--- a/.github/workflows/pull_request.yml
+++ b/.github/workflows/pull_request.yml
@@ -11,7 +11,7 @@ jobs:
       - name: Setup Ruby
         uses: ruby/setup-ruby@v1
         with:
-          rubygems: latest
+          rubygems: 3.5.23
           bundler-cache: true
       - name: Run RSpec
         run: bundle exec rake spec