diff --git a/.travis.yml b/.travis.yml
index ca3df8c..e573c19 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,23 +3,12 @@ cache: bundler
 sudo: false
 
 rvm:
-  - 2.2.10
   - 2.3.7
   - 2.4.4
   - 2.5.1
 
-matrix:
-  include:
-  - rvm: 2.1.10
-    gemfile: gemfiles/ruby_2.1.gemfile
+script: bundle exec rspec
 
-# https://github.com/travis-ci/travis-ci/issues/8978
-before_install:
-  - gem update --system
-  - gem install bundler # https://github.com/travis-ci/travis-ci/issues/9383
-  - bundle --version
-
-script: "bundle exec rspec"
 deploy:
   provider: rubygems
   gem: mauth-client
diff --git a/CHANGELOG.md b/CHANGELOG.md
index c15a97b..aed93b5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,6 @@
-# MAuth-Client History
+## v4.1.0
+- Drop support for Ruby < 2.3.0
+- Update development dependencies
 
 ## v4.0.4
 - Restore original behavior in the proxy of forwarding of headers that begin with HTTP_ (except for HTTP_HOST) but removing the HTTP_.
diff --git a/Rakefile b/Rakefile
index 8879b44..4c774a2 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,6 +1,5 @@
 require 'bundler/gem_tasks'
 require 'rspec/core/rake_task'
-require 'kender/tasks'
 
 RSpec::Core::RakeTask.new(:spec)
 
diff --git a/gemfiles/ruby_2.1.gemfile b/gemfiles/ruby_2.1.gemfile
deleted file mode 100644
index fa37ff2..0000000
--- a/gemfiles/ruby_2.1.gemfile
+++ /dev/null
@@ -1,5 +0,0 @@
-source "https://rubygems.org"
-
-gem "rack", "1.6.5"
-
-gemspec :path => "../"
diff --git a/lib/mauth/version.rb b/lib/mauth/version.rb
index f62aa89..5a033d4 100644
--- a/lib/mauth/version.rb
+++ b/lib/mauth/version.rb
@@ -1,3 +1,3 @@
 module MAuth
-  VERSION = '4.0.4'.freeze
+  VERSION = '4.1.0'.freeze
 end
diff --git a/mauth-client.gemspec b/mauth-client.gemspec
index 53af19e..3c99caa 100644
--- a/mauth-client.gemspec
+++ b/mauth-client.gemspec
@@ -11,7 +11,7 @@ Gem::Specification.new do |spec|
   spec.description   = 'Client for signing and authentication of requests and responses with mAuth authentication. Includes middleware for Rack and Faraday for incoming and outgoing requests and responses.'
   spec.homepage      = 'https://github.com/mdsol/mauth-client-ruby'
   spec.license       = 'MIT'
-  spec.required_ruby_version = '>= 2.1.0'
+  spec.required_ruby_version = '>= 2.3.0'
 
   spec.files         = `git ls-files -z`.split("\x0").reject { |f| f.match(%r{^(test|spec|features)/}) }
   spec.bindir        = 'exe'
@@ -27,11 +27,9 @@ Gem::Specification.new do |spec|
 
   spec.add_development_dependency 'bundler', '~> 1.10'
   spec.add_development_dependency 'byebug'
-  spec.add_development_dependency 'kender', '~> 0.4'
-  spec.add_development_dependency 'rack-test', '~> 0.6.3'
-  spec.add_development_dependency 'rake', '~> 10.0'
-  spec.add_development_dependency 'rspec', '~> 3.4'
-  spec.add_development_dependency 'simplecov', '~> 0.12.0'
-  spec.add_development_dependency 'timecop', '~> 0.8.1'
-  spec.add_development_dependency 'uuidtools', '~> 2.1.5'
+  spec.add_development_dependency 'rack-test', '~> 1.1.0'
+  spec.add_development_dependency 'rake', '~> 12.0'
+  spec.add_development_dependency 'rspec', '~> 3.8'
+  spec.add_development_dependency 'simplecov', '~> 0.16'
+  spec.add_development_dependency 'timecop', '~> 0.9'
 end
diff --git a/spec/mauth_client_spec.rb b/spec/mauth_client_spec.rb
index fdd7f93..a1c4b28 100644
--- a/spec/mauth_client_spec.rb
+++ b/spec/mauth_client_spec.rb
@@ -1,8 +1,11 @@
 require 'spec_helper'
 require 'faraday'
 require 'mauth/client'
+require 'securerandom'
 
 describe MAuth::Client do
+  let(:app_uuid) { SecureRandom.uuid }
+
   describe '#initialize' do
     it 'initializes without config' do
       mc = MAuth::Client.new
@@ -91,14 +94,15 @@ def x_mws_authentication
 
   describe '#signed' do
     before { @request = TestSignableRequest.new(:verb => 'PUT', :request_url => '/', :body => 'himom') }
+
     it 'adds X-MWS-Time and X-MWS-Authentication headers when signing' do
-      mc = MAuth::Client.new(:private_key => OpenSSL::PKey::RSA.generate(2048), :app_uuid => UUIDTools::UUID.random_create.to_s)
+      mc = MAuth::Client.new(:private_key => OpenSSL::PKey::RSA.generate(2048), :app_uuid => app_uuid)
       signed_request = mc.signed(@request)
       expect(signed_request.headers.keys).to include('X-MWS-Authentication')
       expect(signed_request.headers.keys).to include('X-MWS-Time')
     end
     it "can't sign without a private key" do
-      mc = MAuth::Client.new(:app_uuid => UUIDTools::UUID.random_create.to_s)
+      mc = MAuth::Client.new(:app_uuid => app_uuid)
       expect{mc.signed(@request)}.to raise_error(MAuth::UnableToSignError)
     end
     it "can't sign without an app uuid" do
@@ -106,9 +110,10 @@ def x_mws_authentication
       expect{mc.signed(@request)}.to raise_error(MAuth::UnableToSignError)
     end
   end
+
   describe '#signed_headers' do
     it 'returns a hash with X-MWS-Time and X-MWS-Authentication headers' do
-      mc = MAuth::Client.new(:private_key => OpenSSL::PKey::RSA.generate(2048), :app_uuid => UUIDTools::UUID.random_create.to_s)
+      mc = MAuth::Client.new(:private_key => OpenSSL::PKey::RSA.generate(2048), :app_uuid => app_uuid)
       signed_headers = mc.signed_headers(TestSignableRequest.new(:verb => 'PUT', :request_url => '/', :body => 'himom'))
       expect(signed_headers.keys).to include('X-MWS-Authentication')
       expect(signed_headers.keys).to include('X-MWS-Time')
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index e036dd4..7c74950 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -1,5 +1,4 @@
 require 'timecop'
-require 'uuidtools'
 require 'json'
 require 'rack/mock'