diff --git a/lib/bundler/cli.rb b/lib/bundler/cli.rb
index 7744a6f8018..229ceb48bec 100644
--- a/lib/bundler/cli.rb
+++ b/lib/bundler/cli.rb
@@ -718,6 +718,8 @@ def warn_on_outdated_bundler
       command_name = current_command.name
       return if PARSEABLE_COMMANDS.include?(command_name)
 
+      return unless SharedHelpers.md5_available?
+
       latest = Fetcher::CompactIndex.
                new(nil, Source::Rubygems::Remote.new(URI("https://rubygems.org")), nil).
                send(:compact_index_client).