diff --git a/gemfiles/Gemfile.rails-5.0 b/gemfiles/Gemfile.rails-5.0
index 8f25ff72..bf093e54 100644
--- a/gemfiles/Gemfile.rails-5.0
+++ b/gemfiles/Gemfile.rails-5.0
@@ -8,7 +8,7 @@ gem 'railties', '~> 5.0.0'
 group :development, :test do
   gem 'sqlite3', '~> 1.3.7'
   gem 'simplecov', '~> 0.7.0'
-  gem 'minitest', '~> 5.11.3'
+  gem 'minitest', '~> 5.10.0'
   gem 'redcarpet'
   gem 'yard', '~> 0.8'
   gem 'activerecord', '~> 5.0.0'
diff --git a/gemfiles/Gemfile.rails-5.2 b/gemfiles/Gemfile.rails-5.2
index bdb3f6d3..0723c231 100644
--- a/gemfiles/Gemfile.rails-5.2
+++ b/gemfiles/Gemfile.rails-5.2
@@ -8,7 +8,7 @@ gem 'railties', '~> 5.2.0'
 group :development, :test do
   gem 'sqlite3', '~> 1.3.7'
   gem 'simplecov', '~> 0.7.0'
-  gem 'minitest', '~> 5.11.3'
+  gem 'minitest', '~> 5.10.0'
   gem 'redcarpet'
   gem 'yard', '~> 0.8'
   gem 'activerecord', '~> 5.2.0'
diff --git a/public_activity.gemspec b/public_activity.gemspec
index 26016215..4e8a9bf9 100644
--- a/public_activity.gemspec
+++ b/public_activity.gemspec
@@ -43,7 +43,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'mocha', '~> 1.5.0'
   s.add_development_dependency 'simplecov', '~> 0.7.0'
   s.add_development_dependency 'test-unit', '~> 3.2.8'
-  s.add_development_dependency 'minitest', '~> 5.11.3'
+  s.add_development_dependency 'minitest', '~> 4.7.5'
   s.add_development_dependency 'redcarpet'
   s.add_development_dependency 'yard', '~> 0.9.11'
   s.add_development_dependency 'pry'