diff --git a/Gemfile b/Gemfile
index c96b1fa3..721238a0 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,7 +4,7 @@ gem "rake"
 gem "steep", "~> 1.9.0", require: false
 
 gem "uri"
-gem "pathname"
+gem "pathname" if RUBY_VERSION < "4.0.0"
 
 # Specify your gem's dependencies in bitclust.gemspec
 gemspec :name => "bitclust-core"