diff --git a/spec/bundler/realworld/fixtures/warbler/Gemfile.lock b/spec/bundler/realworld/fixtures/warbler/Gemfile.lock
index 15f9a224e55bbb..d84e09f4337a04 100644
--- a/spec/bundler/realworld/fixtures/warbler/Gemfile.lock
+++ b/spec/bundler/realworld/fixtures/warbler/Gemfile.lock
@@ -21,7 +21,7 @@ GEM
     jruby-jars (10.0.0.1)
     jruby-rack (1.2.2)
     rake (13.3.0)
-    rexml (3.4.1)
+    rexml (3.4.2)
     rubyzip (2.4.1)
 
 PLATFORMS
diff --git a/test/ruby/test_module.rb b/test/ruby/test_module.rb
index 5805ad7d9b8860..62b2a7164fb4ff 100644
--- a/test/ruby/test_module.rb
+++ b/test/ruby/test_module.rb
@@ -412,16 +412,6 @@ def test_constants
     assert_equal([:MIXIN, :USER], User.constants.sort)
   end
 
-  def test_initialize_copy
-    mod = Module.new { define_method(:foo) {:first} }
-    klass = Class.new { include mod }
-    instance = klass.new
-    assert_equal(:first, instance.foo)
-    new_mod = Module.new { define_method(:foo) { :second } }
-    4.times { GC.start }
-    assert_equal(:first, instance.foo) # [BUG] unreachable
-  end
-
   def test_initialize_copy_empty
     m = Module.new do
       def x