diff --git a/.github/workflows/ruby.yml b/.github/workflows/ruby.yml
index 1f85890..8b81c83 100644
--- a/.github/workflows/ruby.yml
+++ b/.github/workflows/ruby.yml
@@ -15,16 +15,14 @@ on:
 
 jobs:
   test:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     strategy:
       matrix:
-        ruby-version: [2.3.0, 2.4.4, 2.5.5, 2.6.3, truffleruby-21.3.0]
+        ruby-version: [2.3.0, 2.4.4, 2.5.5, 2.6.3]
         appraisal: ["3.2", "4.0", "4.1", "4.2", "5.0", "5.1", "5.2", "6.0"]
         include:
           - ruby-version: 2.7.5
             appraisal: "7.0"
-          - ruby-version: truffleruby
-            appraisal: "7.0"
         exclude:
           - ruby-version: 2.3.0
             appraisal: "4.2"
@@ -56,25 +54,15 @@ jobs:
             appraisal: "4.1"
           - ruby-version: 2.6.3
             appraisal: "4.2"
-          - ruby-version: truffleruby-21.3.0
-            appraisal: "3.2"
-          - ruby-version: truffleruby-21.3.0
-            appraisal: "4.0"
-          - ruby-version: truffleruby-21.3.0
-            appraisal: "4.1"
-          - ruby-version: truffleruby-21.3.0
-            appraisal: "4.2"
+
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Set up Ruby
-        # To automatically get bug fixes and new Ruby versions for ruby/setup-ruby,
-        # change this to (see https://github.com/ruby/setup-ruby#versioning):
         uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby-version }}
-          bundler-cache: false # runs 'bundle install' and caches installed gems automatically
-      - name: Set system gem command
-        run: gem update --system
+          rubygems: default
+          bundler: none
       - name: Install compatible bundler for all envs
         run: gem install bundler -v 1.17.3
       - name: Bundle for Appraisal