diff --git a/lib/bundler/definition.rb b/lib/bundler/definition.rb
index df8ee1f54ba..3964c07fb50 100644
--- a/lib/bundler/definition.rb
+++ b/lib/bundler/definition.rb
@@ -855,8 +855,8 @@ def metadata_dependencies
           concat_ruby_version_requirements(locked_ruby_version_object) unless @unlock[:ruby]
         end
         [
-          Dependency.new("ruby\0", ruby_versions),
-          Dependency.new("rubygems\0", Gem::VERSION),
+          Dependency.new("Ruby\0", ruby_versions),
+          Dependency.new("RubyGems\0", Gem::VERSION),
         ]
       end
     end
diff --git a/lib/bundler/resolver.rb b/lib/bundler/resolver.rb
index 13fe436cb1d..3fd1706371a 100644
--- a/lib/bundler/resolver.rb
+++ b/lib/bundler/resolver.rb
@@ -308,7 +308,7 @@ def version_conflict_message(e)
         deps = conflict.requirement_trees.map(&:last).flatten(1)
         !Bundler::VersionRanges.empty?(*Bundler::VersionRanges.for_many(deps.map(&:requirement)))
       end
-      e.conflicts.replace(conflicts) unless conflicts.empty?
+      e = Molinillo::VersionConflict.new(conflicts, e.specification_provider) unless conflicts.empty?
 
       solver_name = "Bundler"
       possibility_type = "gem"
@@ -329,7 +329,7 @@ def version_conflict_message(e)
 
           trees.reject! {|t| !maximal.include?(t.last) } if maximal
 
-          trees.sort_by {|t| [t.flatten.map(&:to_s), t.reverse.map(&:name)] }
+          trees.sort_by {|t| t.reverse.map(&:name) }
         end,
         :printable_requirement => lambda {|req| SharedHelpers.pretty_dependency(req) },
         :additional_message_for_conflict => lambda do |o, name, conflict|
diff --git a/lib/bundler/resolver/spec_group.rb b/lib/bundler/resolver/spec_group.rb
index 34d043aed7f..119f63b5c86 100644
--- a/lib/bundler/resolver/spec_group.rb
+++ b/lib/bundler/resolver/spec_group.rb
@@ -94,10 +94,10 @@ def metadata_dependencies(spec, platform)
         return [] if !spec.is_a?(EndpointSpecification) && !spec.is_a?(Gem::Specification)
         dependencies = []
         if !spec.required_ruby_version.nil? && !spec.required_ruby_version.none?
-          dependencies << DepProxy.new(Gem::Dependency.new("ruby\0", spec.required_ruby_version), platform)
+          dependencies << DepProxy.new(Gem::Dependency.new("Ruby\0", spec.required_ruby_version), platform)
         end
         if !spec.required_rubygems_version.nil? && !spec.required_rubygems_version.none?
-          dependencies << DepProxy.new(Gem::Dependency.new("rubygems\0", spec.required_rubygems_version), platform)
+          dependencies << DepProxy.new(Gem::Dependency.new("RubyGems\0", spec.required_rubygems_version), platform)
         end
         dependencies
       end
diff --git a/lib/bundler/source/metadata.rb b/lib/bundler/source/metadata.rb
index 93909002c76..639f262f747 100644
--- a/lib/bundler/source/metadata.rb
+++ b/lib/bundler/source/metadata.rb
@@ -5,8 +5,8 @@ class Source
     class Metadata < Source
       def specs
         @specs ||= Index.build do |idx|
-          idx << Gem::Specification.new("ruby\0", RubyVersion.system.to_gem_version_with_patchlevel)
-          idx << Gem::Specification.new("rubygems\0", Gem::VERSION)
+          idx << Gem::Specification.new("Ruby\0", RubyVersion.system.to_gem_version_with_patchlevel)
+          idx << Gem::Specification.new("RubyGems\0", Gem::VERSION)
 
           idx << Gem::Specification.new do |s|
             s.name     = "bundler"
diff --git a/spec/install/gems/resolving_spec.rb b/spec/install/gems/resolving_spec.rb
index 844653d494e..f581522c712 100644
--- a/spec/install/gems/resolving_spec.rb
+++ b/spec/install/gems/resolving_spec.rb
@@ -142,14 +142,14 @@
           expect(out).to_not include("Gem::InstallError: require_ruby requires Ruby version > 9000")
 
           nice_error = strip_whitespace(<<-E).strip
-            Bundler found conflicting requirements for the ruby\0 version:
+            Bundler found conflicting requirements for the Ruby\0 version:
               In Gemfile:
-                ruby\0 (#{error_message_requirement})
+                Ruby\0 (#{error_message_requirement})
 
                 require_ruby was resolved to 1.0, which depends on
-                  ruby\0 (> 9000)
+                  Ruby\0 (> 9000)
 
-            ruby\0 (> 9000), which is required by gem 'require_ruby', is not available in the local ruby installation
+            Ruby\0 (> 9000), which is required by gem 'require_ruby', is not available in the local ruby installation
           E
           expect(last_command.bundler_err).to end_with(nice_error)
         end
diff --git a/spec/resolver/basic_spec.rb b/spec/resolver/basic_spec.rb
index 6d2dea2fb38..a2d5e133778 100644
--- a/spec/resolver/basic_spec.rb
+++ b/spec/resolver/basic_spec.rb
@@ -157,10 +157,10 @@
         s.required_ruby_version = "~> 2.0.0"
       end
 
-      gem "ruby\0", "1.8.7"
+      gem "Ruby\0", "1.8.7"
     end
     dep "foo"
-    dep "ruby\0", "1.8.7"
+    dep "Ruby\0", "1.8.7"
 
     deps = []
     @deps.each do |d|
diff --git a/spec/support/indexes.rb b/spec/support/indexes.rb
index c56d6145a7a..5f6c515735a 100644
--- a/spec/support/indexes.rb
+++ b/spec/support/indexes.rb
@@ -76,7 +76,7 @@ def an_awesome_index
         gem "rack-mount", %w[0.4 0.5 0.5.1 0.5.2 0.6]
 
         # --- Pre-release support
-        gem "rubygems\0", ["1.3.2"]
+        gem "RubyGems\0", ["1.3.2"]
 
         # --- Rails
         versions "1.2.3 2.2.3 2.3.5 3.0.0.beta 3.0.0.beta1" do |version|
@@ -413,7 +413,7 @@ def optional_prereleases_index
         gem("b", %w[0.9.0 1.5.0 2.0.0.pre])
 
         # --- Pre-release support
-        gem "rubygems\0", ["1.3.2"]
+        gem "RubyGems\0", ["1.3.2"]
       end
     end
   end