diff --git a/.travis.yml b/.travis.yml
index 962e1d0..6d673c0 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,6 @@
 language: ruby
 rvm:
+  - 2.6.3
   - 2.3.0
   - 2.2.0
   - 2.1.0
diff --git a/Gemfile.lock b/Gemfile.lock
index cfa5ba9..83775e5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,28 +1,29 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    diff-lcs (1.2.5)
-    docile (1.1.5)
-    minitest (5.8.4)
-    multi_json (1.10.1)
-    rake (10.4.2)
-    rspec (3.1.0)
-      rspec-core (~> 3.1.0)
-      rspec-expectations (~> 3.1.0)
-      rspec-mocks (~> 3.1.0)
-    rspec-core (3.1.7)
-      rspec-support (~> 3.1.0)
-    rspec-expectations (3.1.2)
+    diff-lcs (1.3)
+    docile (1.3.1)
+    json (2.2.0)
+    minitest (5.11.3)
+    rake (12.3.2)
+    rspec (3.8.0)
+      rspec-core (~> 3.8.0)
+      rspec-expectations (~> 3.8.0)
+      rspec-mocks (~> 3.8.0)
+    rspec-core (3.8.0)
+      rspec-support (~> 3.8.0)
+    rspec-expectations (3.8.3)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.1.0)
-    rspec-mocks (3.1.3)
-      rspec-support (~> 3.1.0)
-    rspec-support (3.1.2)
-    simplecov (0.9.1)
-      docile (~> 1.1.0)
-      multi_json (~> 1.0)
-      simplecov-html (~> 0.8.0)
-    simplecov-html (0.8.0)
+      rspec-support (~> 3.8.0)
+    rspec-mocks (3.8.0)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.8.0)
+    rspec-support (3.8.0)
+    simplecov (0.16.1)
+      docile (~> 1.1)
+      json (>= 1.8, < 3)
+      simplecov-html (~> 0.10.0)
+    simplecov-html (0.10.2)
 
 PLATFORMS
   ruby
@@ -32,3 +33,6 @@ DEPENDENCIES
   rake
   rspec
   simplecov
+
+BUNDLED WITH
+   2.0.1
diff --git a/Rakefile b/Rakefile
index 7f30bf5..a656605 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'bundler/setup'
 require 'bundler/gem_tasks'
 require 'rake/testtask'
@@ -11,29 +13,28 @@ begin
   require 'rspec/core/rake_task'
 
   RSpec::Core::RakeTask.new(:refinement) do |task|
-    task.rspec_opts = "--order rand"
-    task.pattern = "spec/refinement/*_spec.rb"
+    task.rspec_opts = '--order rand'
+    task.pattern = 'spec/refinement/*_spec.rb'
   end
 
   RSpec::Core::RakeTask.new(:monkeypatch) do |task|
-    task.rspec_opts = "--order rand"
-    task.pattern = "spec/monkeypatch/*_spec.rb"
+    task.rspec_opts = '--order rand'
+    task.pattern = 'spec/monkeypatch/*_spec.rb'
   end
 
   RSpec::Core::RakeTask.new(:safe) do |task|
-    task.rspec_opts = "--order rand"
-    task.pattern = "spec/safe/*_spec.rb"
+    task.rspec_opts = '--order rand'
+    task.pattern = 'spec/safe/*_spec.rb'
   end
-
 rescue LoadError
-  warn "rspec unavailable"
+  warn 'rspec unavailable'
 end
 
 task :default do
-  Rake::Task["test"].invoke
-  Rake::Task["monkeypatch"].invoke
-  Rake::Task["safe"].invoke
-  Rake::Task["refinement"].invoke if ruby_major >= 2 && ruby_minor >= 1
+  Rake::Task['test'].invoke
+  Rake::Task['monkeypatch'].invoke
+  Rake::Task['safe'].invoke
+  Rake::Task['refinement'].invoke if ruby_major >= 2 && ruby_minor >= 1
 end
 
 def ruby_major
@@ -43,6 +44,3 @@ end
 def ruby_minor
   RUBY_VERSION.split(/\./)[1].to_i
 end
-
-
-
diff --git a/descriptive_statistics.gemspec b/descriptive_statistics.gemspec
index 1a2a02a..6d93bd2 100644
--- a/descriptive_statistics.gemspec
+++ b/descriptive_statistics.gemspec
@@ -1,6 +1,6 @@
 Gem::Specification.new do |s|
   s.name        = 'descriptive_statistics'
-  s.version     = '2.5.1'
+  s.version     = '2.5.2'
   s.homepage    = 'https://github.com/thirtysixthspan/descriptive_statistics'
   s.summary     = 'Descriptive Statistics'
   s.description = 'Adds descriptive statistics methods to Enumerable module for use on collections or Numeric data'
@@ -9,4 +9,3 @@ Gem::Specification.new do |s|
   s.files       = Dir['lib/**/**/*']
   s.license     = "MIT"
 end
-
diff --git a/pkg/descriptive_statistics-2.5.1.gem b/pkg/descriptive_statistics-2.5.1.gem
deleted file mode 100644
index 77b2338..0000000
Binary files a/pkg/descriptive_statistics-2.5.1.gem and /dev/null differ
diff --git a/pkg/descriptive_statistics-2.5.2.gem b/pkg/descriptive_statistics-2.5.2.gem
new file mode 100644
index 0000000..ae75621
Binary files /dev/null and b/pkg/descriptive_statistics-2.5.2.gem differ
diff --git a/test/test.rb b/test/test.rb
index 569b49f..cb96b13 100644
--- a/test/test.rb
+++ b/test/test.rb
@@ -5,64 +5,64 @@
 
 SimpleCov.command_name 'minitest'
 
-class TestData < MiniTest::Unit::TestCase
+class TestData < Minitest::Test
 
   def setup
     @data = []
-    CSV.foreach("test/testdata.csv") do |row|
+    CSV.foreach('test/testdata.csv') do |row|
       @data.push row.map(&:to_f)
     end
   end
 
   def test_sum
     @data.each do |test_case|
-      assert_equal test_case[0,10].sum.round(6), test_case[10].round(6)
+      assert_equal test_case[0, 10].sum.round(6), test_case[10].round(6)
     end
   end
 
   def test_mean
     @data.each do |test_case|
-      assert_equal test_case[0,10].mean.round(6), test_case[11].round(6)
+      assert_equal test_case[0, 10].mean.round(6), test_case[11].round(6)
     end
   end
 
   def test_median
     @data.each do |test_case|
-      assert_equal test_case[0,10].median.round(6), test_case[12].round(6)
+      assert_equal test_case[0, 10].median.round(6), test_case[12].round(6)
     end
   end
 
   def test_variance
     @data.each do |test_case|
-      assert_equal test_case[0,10].variance.round(6), test_case[13].round(6)
+      assert_equal test_case[0, 10].variance.round(6), test_case[13].round(6)
     end
   end
 
   def test_standard_deviation
     @data.each do |test_case|
-      assert_equal test_case[0,10].standard_deviation.round(6), test_case[14].round(6)
+      assert_equal test_case[0, 10].standard_deviation.round(6), test_case[14].round(6)
     end
   end
 
   def test_percentile
     @data.each do |test_case|
-      assert_equal test_case[0,10].percentile(0).round(6), test_case[15].round(6)
-      assert_equal test_case[0,10].percentile(10).round(6), test_case[16].round(6)
-      assert_equal test_case[0,10].percentile(20).round(6), test_case[17].round(6)
-      assert_equal test_case[0,10].percentile(30).round(6), test_case[18].round(6)
-      assert_equal test_case[0,10].percentile(40).round(6), test_case[19].round(6)
-      assert_equal test_case[0,10].percentile(50).round(6), test_case[20].round(6)
-      assert_equal test_case[0,10].percentile(60).round(6), test_case[21].round(6)
-      assert_equal test_case[0,10].percentile(70).round(6), test_case[22].round(6)
-      assert_equal test_case[0,10].percentile(80).round(6), test_case[23].round(6)
-      assert_equal test_case[0,10].percentile(90).round(6), test_case[24].round(6)
-      assert_equal test_case[0,10].percentile(100).round(6), test_case[25].round(6)
+      assert_equal test_case[0, 10].percentile(0).round(6), test_case[15].round(6)
+      assert_equal test_case[0, 10].percentile(10).round(6), test_case[16].round(6)
+      assert_equal test_case[0, 10].percentile(20).round(6), test_case[17].round(6)
+      assert_equal test_case[0, 10].percentile(30).round(6), test_case[18].round(6)
+      assert_equal test_case[0, 10].percentile(40).round(6), test_case[19].round(6)
+      assert_equal test_case[0, 10].percentile(50).round(6), test_case[20].round(6)
+      assert_equal test_case[0, 10].percentile(60).round(6), test_case[21].round(6)
+      assert_equal test_case[0, 10].percentile(70).round(6), test_case[22].round(6)
+      assert_equal test_case[0, 10].percentile(80).round(6), test_case[23].round(6)
+      assert_equal test_case[0, 10].percentile(90).round(6), test_case[24].round(6)
+      assert_equal test_case[0, 10].percentile(100).round(6), test_case[25].round(6)
     end
   end
 
   def test_percentile_rank
     @data.each do |test_case|
-      assert_equal test_case[0,10].percentile_rank(50).round(6), test_case[26].round(6)
+      assert_equal test_case[0, 10].percentile_rank(50).round(6), test_case[26].round(6)
     end
   end