diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index ac38a53..71bb52a 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -20,10 +20,10 @@ jobs:
           draft: false
           prerelease: false
           generateReleaseNotes: true
-      - name: Install Ruby 2.5.8
+      - name: Install Ruby jruby-9.3.6.0
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: '2.5.8'
+          ruby-version: 'jruby-9.3.6.0'
       - name: Build gem
         run: gem build *.gemspec
       - name: Publish gem
diff --git a/.github/workflows/testing.yml b/.github/workflows/testing.yml
index 501403f..068495e 100644
--- a/.github/workflows/testing.yml
+++ b/.github/workflows/testing.yml
@@ -18,7 +18,7 @@ jobs:
     strategy:
       matrix:
         ruby-version:
-          - '2.5.8'
+          - 'jruby-9.3.6.0'
     steps:
     - uses: actions/checkout@v2
     - name: Set up Ruby
@@ -34,8 +34,7 @@ jobs:
     strategy:
       matrix:
         ruby-version:
-          - '2.5.8'
-          - 'jruby-9.2.12.0'
+          - 'jruby-9.3.6.0'
     steps:
     - uses: actions/checkout@v2
     - name: Set up Ruby