diff --git a/irb.gemspec b/irb.gemspec
index 50f6a2220..a008a39f9 100644
--- a/irb.gemspec
+++ b/irb.gemspec
@@ -42,5 +42,5 @@ Gem::Specification.new do |spec|
   spec.required_ruby_version = Gem::Requirement.new(">= 2.7")
 
   spec.add_dependency "reline", ">= 0.3.8"
-  spec.add_dependency "rdoc", "~> 6.5"
+  spec.add_dependency "rdoc"
 end