diff --git a/carpentry.gemspec b/carpentry.gemspec
index 1ada44f..b2bd5b3 100644
--- a/carpentry.gemspec
+++ b/carpentry.gemspec
@@ -29,6 +29,5 @@ Gem::Specification.new do |s|
   if Gem::Version.new(RUBY_VERSION) >= Gem::Version.new('3.4')
     s.add_development_dependency "bigdecimal"
     s.add_development_dependency "mutex_m"
-    s.add_development_dependency "drb"
   end
 end