diff --git a/.travis.yml b/.travis.yml
index 8b38cf4..a22b063 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,22 +1,21 @@
 language: ruby
 rvm:
-  - 2.2
-  - 2.3
-  - 2.4.1
+  - 2.5.7
+  - 2.6.5
   - jruby
   - rbx-2
 
+gemfile:
+  - gemfiles/sidekiq52_rails42.gemfile
+  - gemfiles/sidekiq52_rails52.gemfile
+  - gemfiles/sidekiq60_rails52.gemfile
+
 script: "bundle exec rspec spec"
 
 before_install:
-  - gem install bundler
+  - gem install bundler:1.17.3
 
 matrix:
   allow_failures:
     - rvm: jruby
     - rvm: rbx-2
-  include:
-    - rvm: 2.0
-      gemfile: gemfiles/ruby20.gemfile
-    - rvm: 2.4
-      gemfile: gemfiles/sidekiq4.gemfile
diff --git a/gemfiles/ruby20.gemfile b/gemfiles/ruby20.gemfile
deleted file mode 100644
index efefa36..0000000
--- a/gemfiles/ruby20.gemfile
+++ /dev/null
@@ -1,6 +0,0 @@
-source 'https://rubygems.org'
-
-gem 'sidekiq', '< 5'
-gem 'nokogiri', '< 1.7'
-
-gemspec :path => '../'
diff --git a/gemfiles/sidekiq4.gemfile b/gemfiles/sidekiq4.gemfile
deleted file mode 100644
index ce408bd..0000000
--- a/gemfiles/sidekiq4.gemfile
+++ /dev/null
@@ -1,5 +0,0 @@
-source 'https://rubygems.org'
-
-gem 'sidekiq', '< 5'
-
-gemspec :path => '../'
diff --git a/gemfiles/sidekiq52_rails42.gemfile b/gemfiles/sidekiq52_rails42.gemfile
new file mode 100644
index 0000000..cb8e3d1
--- /dev/null
+++ b/gemfiles/sidekiq52_rails42.gemfile
@@ -0,0 +1,12 @@
+source 'https://rubygems.org'
+
+gem 'sidekiq', '~> 5.2.2'
+gem 'nokogiri', '~> 1.8.5'
+gem 'rspec-core', '~> 3.8'
+gem 'activejob', '~> 4.2'
+gem 'actionmailer', '~> 4.2'
+gem 'activerecord', '~> 4.2'
+gem "activemodel", "~> 4.2"
+gem "railties", "~> 4.2"
+
+gemspec :path => '../'
\ No newline at end of file
diff --git a/gemfiles/sidekiq52_rails52.gemfile b/gemfiles/sidekiq52_rails52.gemfile
new file mode 100644
index 0000000..6717fd0
--- /dev/null
+++ b/gemfiles/sidekiq52_rails52.gemfile
@@ -0,0 +1,12 @@
+source 'https://rubygems.org'
+
+gem 'sidekiq', '~> 5.2.2'
+gem 'nokogiri', '~> 1.8.5'
+gem 'rspec-core', '~> 3.8'
+gem 'activejob', '~> 5.2'
+gem 'actionmailer', '~> 5.2'
+gem 'activerecord', '~> 5.2'
+gem "activemodel", "~> 5.2"
+gem "railties", "~> 5.2"
+
+gemspec :path => '../'
diff --git a/gemfiles/sidekiq60_rails52.gemfile b/gemfiles/sidekiq60_rails52.gemfile
new file mode 100644
index 0000000..560e86c
--- /dev/null
+++ b/gemfiles/sidekiq60_rails52.gemfile
@@ -0,0 +1,12 @@
+source 'https://rubygems.org'
+
+gem 'sidekiq', '~> 6.0'
+gem 'nokogiri', '~> 1.8.5'
+gem 'rspec-core', '~> 3.8'
+gem 'activejob', '~> 5.2'
+gem 'actionmailer', '~> 5.2'
+gem 'activerecord', '~> 5.2'
+gem "activemodel", "~> 5.2"
+gem "railties", "~> 5.2"
+
+gemspec :path => '../'
diff --git a/rspec-sidekiq.gemspec b/rspec-sidekiq.gemspec
index f4bf5a3..44f71ed 100644
--- a/rspec-sidekiq.gemspec
+++ b/rspec-sidekiq.gemspec
@@ -14,12 +14,14 @@ Gem::Specification.new do |s|
   s.add_dependency 'rspec-core', '~> 3.0', '>= 3.0.0'
   s.add_dependency 'sidekiq', '>= 2.4.0'
 
-  s.add_development_dependency 'rspec', '~> 3.0'
-  s.add_development_dependency 'coveralls', '~> 0.8', '>= 0.8.0'
-  s.add_development_dependency 'fuubar', '~> 2.0', '>= 2.0.0'
-  s.add_development_dependency 'activejob', '~> 4.2', '>= 4.0.0'
-  s.add_development_dependency 'actionmailer', '~> 4.2', '>= 4.0.0'
-  s.add_development_dependency 'activerecord', '~> 4.2', '>= 4.0.0'
+  s.add_development_dependency 'rspec'
+  s.add_development_dependency 'coveralls'
+  s.add_development_dependency 'fuubar'
+  s.add_development_dependency 'activejob'
+  s.add_development_dependency 'actionmailer'
+  s.add_development_dependency 'activerecord'
+  s.add_development_dependency 'activemodel'
+  s.add_development_dependency 'activesupport'
 
 
   s.files = Dir['.gitattributes'] +
diff --git a/spec/rspec/sidekiq/matchers/be_unique_spec.rb b/spec/rspec/sidekiq/matchers/be_unique_spec.rb
index b998d32..26baf5f 100644
--- a/spec/rspec/sidekiq/matchers/be_unique_spec.rb
+++ b/spec/rspec/sidekiq/matchers/be_unique_spec.rb
@@ -108,7 +108,7 @@
 
     context "without a uniquing solution" do
       it "raises an exception" do
-        expect{subject.unique_key}.to raise_error
+        expect{subject.unique_key}.to raise_error RuntimeError, 'No support found for Sidekiq unique jobs'
       end
     end
   end
diff --git a/spec/rspec/sidekiq/matchers/have_enqueued_job_spec.rb b/spec/rspec/sidekiq/matchers/have_enqueued_job_spec.rb
index 47b4f92..dff4e93 100644
--- a/spec/rspec/sidekiq/matchers/have_enqueued_job_spec.rb
+++ b/spec/rspec/sidekiq/matchers/have_enqueued_job_spec.rb
@@ -4,13 +4,14 @@
   let(:tomorrow) { DateTime.now + 1 }
   let(:interval) { 3.minutes }
   let(:argument_subject) { RSpec::Sidekiq::Matchers::HaveEnqueuedJob.new worker_args }
-  let(:matcher_subject) { RSpec::Sidekiq::Matchers::HaveEnqueuedJob.new [be_a(String), be_a(Fixnum), true, be_a(Hash)] }
+  let(:matcher_subject) { RSpec::Sidekiq::Matchers::HaveEnqueuedJob.new [be_a(String), be_a(Integer), true, be_a(Hash)] }
   let(:worker) { create_worker }
   let(:worker_args) { ['string', 1, true, { key: 'value', bar: :foo, nested: [{hash: true}] }] }
   let(:active_job) { create_active_job :mailers }
   let(:resource) { TestResource.new }
 
   before(:each) do
+    GlobalID.app = 'rspec-sidekiq'
     worker.perform_async *worker_args
     active_job.perform_later 'someResource'
     active_job.perform_later(resource)
diff --git a/spec/support/test_resource.rb b/spec/support/test_resource.rb
index 9107117..1201821 100644
--- a/spec/support/test_resource.rb
+++ b/spec/support/test_resource.rb
@@ -1,16 +1,10 @@
 class TestResource
   include GlobalID::Identification
 
-  attr_reader :global_id
-
-  def initialize
-    @global_id = GlobalID.create(self, { app: 'rspec-sidekiq' })
-  end
-
   def self.find(id)
   end
 
   def id
-    rand(36**10).to_s 36
+    @id ||= rand(36**10).to_s 36
   end
 end