fillable-pdf.gemspec in fillable-pdf-0.9.3 vs fillable-pdf.gemspec in fillable-pdf-0.9.4

@@ -28,10 +28,11 @@
   spec.add_development_dependency 'rubocop-md'
   spec.add_development_dependency 'rubocop-minitest'
   spec.add_development_dependency 'rubocop-performance'
   spec.add_development_dependency 'rubocop-rake'
 
-  spec.add_runtime_dependency 'rjb', '1.6.2'
+  spec.add_runtime_dependency 'rjb', '~> 1.6'
+  spec.requirements << 'JDK 8.x - 11.x'
 
   spec.metadata = {
     'rubygems_mfa_required' => 'true'
   }
 end