diff --git a/.travis.yml b/.travis.yml
index c0aaecac..5a253b26 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,9 +1,13 @@
 language: ruby
 rvm:
-  - 1.9.3
-  - 2.2.10
-  - 2.3.8
-  - 2.4.5
-  - 2.5.3
-  - jruby-9.1.17.0
-  - jruby-9.2.5.0
+  - 2.4.10
+  - 2.5.8
+  - 2.6.6
+  - 2.7.1
+  - jruby-9.2.12.0
+  - ruby-head
+  - jruby-head
+matrix:
+  allow_failures:
+    - rvm: ruby-head
+    - rvm: jruby-head
diff --git a/Gemfile b/Gemfile
index afadc0c4..e9fece90 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,7 +4,3 @@
 source 'https://rubygems.org'
 
 gemspec
-
-gem 'json', '< 2' if RUBY_VERSION.start_with?('1.')
-gem 'nokogiri', '< 1.6' if RUBY_VERSION.start_with?('1.8.')
-gem 'test-unit', '~> 2.5' if RUBY_VERSION.start_with?('1.8.')
diff --git a/rbvmomi.gemspec b/rbvmomi.gemspec
index 0f634299..0056cc2b 100644
--- a/rbvmomi.gemspec
+++ b/rbvmomi.gemspec
@@ -29,5 +29,5 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency('yard', '~> 0.9.5')
   spec.add_development_dependency('test-unit', '>= 2.5')
 
-  spec.required_ruby_version = '>= 1.8.7'
+  spec.required_ruby_version = '>= 2.4.1'
 end
diff --git a/test/test_helper.rb b/test/test_helper.rb
index 20cf508c..e1f41ec9 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -1,10 +1,8 @@
 # Copyright (c) 2011-2017 VMware, Inc.  All Rights Reserved.
 # SPDX-License-Identifier: MIT
 
-unless /^1.8/ =~ RUBY_VERSION
-  require 'simplecov'
-  SimpleCov.start { add_filter '/test/' }
-end
+require 'simplecov'
+SimpleCov.start { add_filter '/test/' }
 
 require 'rbvmomi'
 VIM = RbVmomi::VIM
diff --git a/test/test_serialization.rb b/test/test_serialization.rb
index d3f4b04f..c17ac9cf 100644
--- a/test/test_serialization.rb
+++ b/test/test_serialization.rb
@@ -240,7 +240,7 @@ def test_keyvalue
     EOS
 
     obj = { 'a' => 'b', :c => 'd' }
-    check <<-EOS, obj, 'KeyValue', true unless RUBY_VERSION =~ /^1.8/
+    check <<-EOS, obj, 'KeyValue', true
 <root>
   <key>a</key>
   <value>b</value>