diff --git a/tdiary-contrib.gemspec b/tdiary-contrib.gemspec
index 15cced4..510adeb 100644
--- a/tdiary-contrib.gemspec
+++ b/tdiary-contrib.gemspec
@@ -42,6 +42,5 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "rspec"
   spec.add_development_dependency "simplecov"
   spec.add_development_dependency "webmock"
-  spec.add_development_dependency "ruby-debug-ide"
-  spec.add_development_dependency "debase"
+  spec.add_development_dependency "debug"
 end