diff --git a/lib/bundler/definition.rb b/lib/bundler/definition.rb
index 3815a55b04..761185ff21 100644
--- a/lib/bundler/definition.rb
+++ b/lib/bundler/definition.rb
@@ -885,7 +885,7 @@ module Bundler
 
     def metadata_dependencies
       @metadata_dependencies ||= [
-        Dependency.new("Ruby\0", Gem.ruby_version),
+        Dependency.new("Ruby\0", Bundler::RubyVersion.system.gem_version),
         Dependency.new("RubyGems\0", Gem::VERSION),
       ]
     end
diff --git a/lib/bundler/source/metadata.rb b/lib/bundler/source/metadata.rb
index 524db9c204..4d27761365 100644
--- a/lib/bundler/source/metadata.rb
+++ b/lib/bundler/source/metadata.rb
@@ -5,7 +5,7 @@ module Bundler
     class Metadata < Source
       def specs
         @specs ||= Index.build do |idx|
-          idx << Gem::Specification.new("Ruby\0", Gem.ruby_version)
+          idx << Gem::Specification.new("Ruby\0", Bundler::RubyVersion.system.gem_version)
           idx << Gem::Specification.new("RubyGems\0", Gem::VERSION) do |s|
             s.required_rubygems_version = Gem::Requirement.default
           end