diff --git a/doc/io_streams.rdoc b/doc/io_streams.rdoc
index a70a84811e..680d5e99c4 100644
--- a/doc/io_streams.rdoc
+++ b/doc/io_streams.rdoc
@@ -406,7 +406,7 @@ which is the non-negative integer line number
 in the stream where the next read will occur.
 
 The line number is the number of lines read by certain line-oriented methods
-({::foreach}[https://docs.ruby-lang.org/en/master/IO.html#method-c-foreach],
+({::foreach}[rdoc-ref:IO.foreach],
 {#each_line}[rdoc-ref:io_streams.rdoc@Method+-23each_line],
 {#gets}[rdoc-ref:io_streams.rdoc@Method+-23gets],
 {#readline}[rdoc-ref:io_streams.rdoc@Method+-23readline],
diff --git a/lib/rubygems/core_ext/kernel_warn.rb b/lib/rubygems/core_ext/kernel_warn.rb
index 8f43e00456..14a69938ca 100644
--- a/lib/rubygems/core_ext/kernel_warn.rb
+++ b/lib/rubygems/core_ext/kernel_warn.rb
@@ -16,7 +16,7 @@ if RUBY_VERSION >= "2.5" && !Gem::KERNEL_WARN_IGNORES_INTERNAL_ENTRIES
 
     module_function define_method(:warn) {|*messages, **kw|
       unless uplevel = kw[:uplevel]
-        if Gem.java_platform?
+        if Gem.java_platform? && RUBY_VERSION < "3.1"
           return original_warn.bind(self).call(*messages)
         else
           return original_warn.bind(self).call(*messages, **kw)