diff --git a/.gitignore b/.gitignore
index 12833c2..b2de917 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,8 +3,7 @@
 .bundle
 .config
 .yardoc
-Gemfile.lock
-*.gemfile.lock
+*.lock
 InstalledFiles
 _yardoc
 coverage
diff --git a/groupdate.gemspec b/groupdate.gemspec
index 8e60d8d..2ede418 100644
--- a/groupdate.gemspec
+++ b/groupdate.gemspec
@@ -22,7 +22,7 @@ Gem::Specification.new do |spec|
 
   spec.add_development_dependency "bundler", "~> 1.3"
   spec.add_development_dependency "rake"
-  spec.add_development_dependency "minitest", ">= 5"
+  spec.add_development_dependency "minitest"
   spec.add_development_dependency "activerecord"
 
   if RUBY_PLATFORM == "java"
diff --git a/test/test_helper.rb b/test/test_helper.rb
index 18d60db..20e7655 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -5,6 +5,8 @@ require "minitest/pride"
 require "logger"
 require "active_record"
 
+Minitest::Test = Minitest::Unit::TestCase unless defined?(Minitest::Test)
+
 # TODO determine why this is necessary
 if RUBY_PLATFORM == "java"
   ENV["TZ"] = "UTC"
--
libgit2 0.21.0