diff --git a/configs/components/rubygem-concurrent-ruby.rb b/configs/components/rubygem-concurrent-ruby.rb
index 259900bc5..1eb246388 100644
--- a/configs/components/rubygem-concurrent-ruby.rb
+++ b/configs/components/rubygem-concurrent-ruby.rb
@@ -1,11 +1,11 @@
 component 'rubygem-concurrent-ruby' do |pkg, settings, platform|
   # Projects may define a :rubygem_concurrent_ruby_version setting
-  version = settings[:rubygem_concurrent_ruby_version] || '1.2.3'
+  version = settings[:rubygem_concurrent_ruby_version] || '1.3.5'
   pkg.version version
 
   case version
-  when '1.2.3'
-    pkg.sha256sum '82fdd3f8a0816e28d513e637bb2b90a45d7b982bdf4f3a0511722d2e495801e2'
+  when '1.3.5'
+    pkg.sha256sum '813b3e37aca6df2a21a3b9f1d497f8cbab24a2b94cab325bffe65ee0f6cbebc6'
   else
     raise "rubygem-concurrent-ruby #{version} has not been configured; Cannot continue."
   end