diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 21a23cb1..0a1344da 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -24,8 +24,8 @@ jobs:
             ruby_version: "2.7"
           - label: Ruby 3.0
             ruby_version: "3.0"
-          - label: JRuby 9.2.14.0
-            ruby_version: "jruby-9.2.14.0"
+          - label: JRuby 9.2.20.1
+            ruby_version: "jruby-9.2.20.1"
     steps:
       - name: Checkout Repository
         uses: actions/checkout@v2
@@ -33,6 +33,7 @@ jobs:
         uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby_version }}
+          bundler: "2.2.31"
           bundler-cache: true
       - name: Run Minitest based tests
         run: bash script/test
@@ -63,6 +64,7 @@ jobs:
         uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby_version }}
+          bundler: "2.2.31"
           bundler-cache: true
       - name: ${{ matrix.step_name }}
         run: bash script/${{ matrix.script_file }}