diff --git a/Gemfile.lock b/Gemfile.lock
index 83b71a0..dfab285 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,9 +1,9 @@
 PATH
   remote: .
   specs:
-    deliver_later_matchers (0.1.1)
-      actionmailer (~> 5.0)
-      activejob (~> 5.0)
+    deliver_later_matchers (0.1.2)
+      actionmailer (>= 4.0)
+      activejob (>= 4.0)
       rspec-expectations (~> 3.0)
       rspec-mocks (~> 3.0)
       rspec-rails (~> 3.0)
@@ -58,7 +58,7 @@ GEM
     method_source (0.9.0)
     mini_mime (1.0.0)
     mini_portile2 (2.3.0)
-    minitest (5.11.1)
+    minitest (5.11.2)
     nokogiri (1.8.1)
       mini_portile2 (~> 2.3.0)
     rack (2.0.3)
diff --git a/deliver_later_matchers.gemspec b/deliver_later_matchers.gemspec
index 551202d..2129ca7 100644
--- a/deliver_later_matchers.gemspec
+++ b/deliver_later_matchers.gemspec
@@ -20,8 +20,8 @@ Gem::Specification.new do |spec|
   spec.executables = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ['lib']
 
-  spec.add_dependency 'actionmailer', '~> 5.0'
-  spec.add_dependency 'activejob', '~> 5.0'
+  spec.add_dependency 'actionmailer', '>= 4.0'
+  spec.add_dependency 'activejob', '>= 4.0'
   spec.add_dependency 'rspec-expectations', '~> 3.0'
   spec.add_dependency 'rspec-mocks', '~> 3.0'
   spec.add_dependency 'rspec-rails', '~> 3.0'
diff --git a/lib/deliver_later_matchers/deliver_later.rb b/lib/deliver_later_matchers/deliver_later.rb
index c9f862e..2e5345f 100644
--- a/lib/deliver_later_matchers/deliver_later.rb
+++ b/lib/deliver_later_matchers/deliver_later.rb
@@ -69,7 +69,7 @@ def queue_adapter
     def check_job_adapter
       return if queue_adapter.is_a?(::ActiveJob::QueueAdapters::TestAdapter)
 
-      raise RuntimeError, "To use DeliverLaterMatchers, set `ActiveJob::Base.queue_adpater = :test`."
+      raise RuntimeError, "To use DeliverLaterMatchers, set `ActiveJob::Base.queue_adapter = :test`."
     end
   end
 end
diff --git a/lib/deliver_later_matchers/version.rb b/lib/deliver_later_matchers/version.rb
index 932905a..9814cde 100644
--- a/lib/deliver_later_matchers/version.rb
+++ b/lib/deliver_later_matchers/version.rb
@@ -1,3 +1,3 @@
 module DeliverLaterMatchers
-  VERSION = "0.1.1"
+  VERSION = '0.1.2'
 end
diff --git a/spec/deliver_later_matchers_spec.rb b/spec/deliver_later_matchers_spec.rb
index ac53847..c84e776 100644
--- a/spec/deliver_later_matchers_spec.rb
+++ b/spec/deliver_later_matchers_spec.rb
@@ -40,7 +40,7 @@ def email_with_args(arg1, arg2)
           ActiveJob::Base.queue_adapter = :async
 
           expect { expect { TestMailer.test_email.deliver_later }.to deliver_later(TestMailer, :test_email) }
-            .to raise_error(RuntimeError,  "To use DeliverLaterMatchers, set `ActiveJob::Base.queue_adpater = :test`.")
+            .to raise_error(RuntimeError,  "To use DeliverLaterMatchers, set `ActiveJob::Base.queue_adapter = :test`.")
         end
       end