diff --git a/Gemfile b/Gemfile
index e4ef0c4..d069402 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,4 +8,3 @@ gem "test-unit-ruby-core"
 
 # rbs requires ruby 3.0+
 gem "rbs", require: false if !RUBY_VERSION.start_with?('2.')
-gem "tsort" if RUBY_VERSION > "4."