diff --git a/Gemfile b/Gemfile
index 6838718..cdf4646 100644
--- a/Gemfile
+++ b/Gemfile
@@ -7,7 +7,7 @@ gem "mocha", "~> 2.0"
 gem "rake", "~> 13.0"
 
 unless ENV["CI"]
-  gem "pry-byebug"
+  gem "debug"
   gem "rubocop", "~> 1.66"
   gem "rubocop-packaging", "~> 0.5"
   gem "rubocop-performance", "~> 1.22"
diff --git a/test/test_helper.rb b/test/test_helper.rb
index 1e99090..c79c97f 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -5,7 +5,7 @@
 require "gemdiff"
 
 begin
-  require "pry-byebug"
+  require "debug"
 rescue LoadError
   # ok
 end