Needs under the bundle exec

Author: hsbt

.github/workflows/push_gem.yml

@@ -40,7 +40,7 @@ jobs:
           ruby-version: ${{ matrix.ruby }}
 
       - name: Build gem for JRuby
-        run: rake build
+        run: bundle exec rake build
         if: matrix.ruby == 'jruby'
 
       - name: Publish to RubyGems