diff --git a/.gitignore b/.gitignore
index effd518..5cce6e7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,7 +4,7 @@ pkg/*
 .idea
 
 # bundler
-Gemfile.lock
+Gemfile.*lock
 
 # vim
 *.swp
diff --git a/.ruby-version b/.ruby-version
new file mode 100644
index 0000000..2bf1c1c
--- /dev/null
+++ b/.ruby-version
@@ -0,0 +1 @@
+2.3.1
diff --git a/.travis.yml b/.travis.yml
index fe161bf..a1ab478 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,21 +1,29 @@
-sudo: false
 language: ruby
 
 script: "rspec"
 
-rvm:
-  - ruby-head
-  - 2.3.1
-  - 2.2.5
-  - 2.1.10
-  - 2.0.0
+matrix:
+  - rvm: ruby-head
+  - rvm: 2.3.1
+  - rvm: 2.2.5
 
-  - jruby-9.1.5.0
-  - jruby-9.0.5.0
-  - jruby-1.7.26
+  - rvm: 2.2.2
+    gemfile: gemfiles/Gemfile.lte-2.2.2
+  - rvm: 2.1.0
+    gemfile: gemfiles/Gemfile.lte-2.2.2
 
-  - rubinius-3.9
-  - rubinius-2.9
+  - rvm: 1.9.3
+    gemfile: gemfiles/Gemfile.lte-1.9.3
+
+  - rvm: 1.8.7
+    gemfile: gemfiles/Gemfile.lte-1.8.7
+
+  - rvm: jruby-9.1.5.0
+  - rvm: jruby-9.0.5.0
+  - rvm: jruby-1.7.26
+
+  - rvm: rubinius-3.9
+  - rvm: rubinius-2.9
 
 notifications:
   on_success: change
diff --git a/Gemfile b/Gemfile
index c49a343..6d36fa4 100644
--- a/Gemfile
+++ b/Gemfile
@@ -11,17 +11,13 @@ group :development, :test do
   gem 'rspec-mocks'
   gem 'rspec-its'
 
-  if RUBY_VERSION < "1.9"
-    gem 'timecop', '0.6.0'
-    gem 'activesupport', '~> 3'
-  else
-    gem 'timecop'
-    gem 'activesupport'
+  gem 'timecop'
+  gem 'byebug'
+  gem 'timecop'
 
-    gem 'byebug'
-  end
+  gem 'activesupport', '~> 5'
 
-  gem 'simplecov', :require => false, :platform => :ruby_20
-  gem 'coveralls', :require => false, :platform => :ruby_20
+  gem 'simplecov', :require => false
+  gem 'coveralls', :require => false
 end
 
diff --git a/Gemfile.lte-1.9.3 b/Gemfile.lte-1.9.3
new file mode 100644
index 0000000..ac39f5a
--- /dev/null
+++ b/Gemfile.lte-1.9.3
@@ -0,0 +1,17 @@
+source "http://rubygems.org"
+
+# Specify your gem's dependencies in yell.gemspec
+gemspec
+
+group :development, :test do
+  gem 'rake'
+
+  gem 'rspec-core', '~> 3'
+  gem 'rspec-expectations'
+  gem 'rspec-mocks'
+  gem 'rspec-its'
+
+  gem 'timecop', '~> 0.8'
+
+  gem 'activesupport', '~> 3'
+end