diff --git a/.github/workflows/ubuntu.yml b/.github/workflows/ubuntu.yml
index bdc9ff8b..af7e735e 100644
--- a/.github/workflows/ubuntu.yml
+++ b/.github/workflows/ubuntu.yml
@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby: [ '2.7', '2.6', '2.5', '2.4', 'head', 'jruby-9.2.10.0']
+        ruby: [ '2.7', '2.6', '2.5', '2.4', 'head', 'jruby-9.2.11.0', jruby-head]
     steps:
     - uses: actions/checkout@master
     - name: Set up Ruby
diff --git a/lib/racc/parser.rb b/lib/racc/parser.rb
index 8d30f52d..8346f019 100644
--- a/lib/racc/parser.rb
+++ b/lib/racc/parser.rb
@@ -190,6 +190,7 @@ class Parser
 
     begin
       if Object.const_defined?(:RUBY_ENGINE) and RUBY_ENGINE == 'jruby'
+        require 'jruby'
         require 'racc/cparse-jruby.jar'
         com.headius.racc.Cparse.new.load(JRuby.runtime, false)
       else