diff --git a/.github/workflows/maven.yml b/.github/workflows/maven.yml
index e3ff76f8..e3ce1e00 100644
--- a/.github/workflows/maven.yml
+++ b/.github/workflows/maven.yml
@@ -16,12 +16,13 @@ on:
 
 jobs:
   build:
-    name: Java ${{ matrix.java_version }}
+    name: JRuby ${{ matrix.jruby_version }} / Java ${{ matrix.java_version }}
     runs-on: ubuntu-latest
 
     strategy:
       matrix:
         java_version: [ '8', '11', '17', '21' ]
+        jruby_version: [ '9.3.15.0', '9.4.9.0' ]
       fail-fast: false
 
     steps:
@@ -33,9 +34,9 @@ jobs:
         distribution: 'temurin'
         cache: maven
     - name: Build with Maven
-      run: mvn -B install --file pom.xml
+      run: mvn -B install --file pom.xml -Djruby.version=${{ matrix.jruby_version }}
 
     # Uploads the full dependency graph to GitHub to improve the quality of Dependabot alerts this repository can receive
     - name: Update dependency graph
       uses: advanced-security/maven-dependency-submission-action@571e99aab1055c2e71a1e2309b9691de18d6b7d6
-      if: github.head_ref == 'refs/heads/master' && matrix.java_version == '8'
+      if: github.head_ref == 'refs/heads/master' && matrix.java_version == '8' && startsWith(matrix.jruby_version, '9.4')
diff --git a/src/spec/ruby/rack/application_spec.rb b/src/spec/ruby/rack/application_spec.rb
index 11d6c87d..d8a5e175 100644
--- a/src/spec/ruby/rack/application_spec.rb
+++ b/src/spec/ruby/rack/application_spec.rb
@@ -361,10 +361,10 @@ def newRuntime() # use the current runtime instead of creating new
         set_config 'jruby.runtime.env', 'false'
         set_config 'jruby.runtime.env.rubyopt', 'true'
 
-        app_factory = app_factory_with_RUBYOPT '-W:no-deprecated'
+        app_factory = app_factory_with_RUBYOPT '-U'
         @runtime = app_factory.newRuntime
         should_eval_as_nil "ENV['HOME']"
-        should_eval_as_eql_to "ENV['RUBYOPT']", '-W:no-deprecated'
+        should_eval_as_eql_to "ENV['RUBYOPT']", '-U'
       end
 
       it "keeps RUBYOPT by default with empty ENV (backwards compat)" do