diff --git a/.rubocop.yml b/.rubocop.yml
index 3c2a8ce..18b949b 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -14,15 +14,6 @@ Layout/ArgumentAlignment:
 Layout/CaseIndentation:
   Enabled: false
 
-Layout/EmptyLineAfterGuardClause:
-  Enabled: false
-
-Layout/EmptyLineAfterMagicComment:
-  Enabled: false
-
-Layout/EmptyLinesAroundAccessModifier:
-  Enabled: false
-
 Layout/EmptyLinesAroundBlockBody:
   Enabled: false
 
@@ -35,9 +26,6 @@ Layout/FirstHashElementIndentation:
 Layout/HashAlignment:
   Enabled: false
 
-Layout/SpaceAfterMethodName:
-  Enabled: false
-
 Layout/SpaceAroundEqualsInParameterDefault:
   Enabled: false
 
@@ -53,27 +41,13 @@ Layout/SpaceInsideBlockBraces:
 Layout/SpaceInsideHashLiteralBraces:
   Enabled: false
 
-Layout/TrailingWhitespace:
-  Enabled: false
-
-Lint/AmbiguousBlockAssociation:
-  Enabled: false
-
 Lint/ConstantDefinitionInBlock:
-  Enabled: false
-
-Lint/DuplicateMethods:
-  Enabled: false
-
-Lint/ParenthesesAsGroupedExpression:
-  Enabled: false
+  Exclude:
+    - spec/**/*
 
 Lint/RedundantSplatExpansion:
   Enabled: false
 
-Lint/ShadowingOuterLocalVariable:
-  Enabled: false
-
 Lint/ToJSON:
   Enabled: false
 
@@ -116,9 +90,6 @@ Style/BlockDelimiters:
 Style/ClassVars:
   Enabled: false
 
-Style/ColonMethodCall:
-  Enabled: false
-
 Style/CombinableLoops:
   Enabled: false
 
@@ -134,18 +105,9 @@ Style/EmptyCaseCondition:
 Style/EmptyMethod:
   Enabled: false
 
-Style/Encoding:
-  Enabled: false
-
-Style/ExpandPathArguments:
-  Enabled: false
-
 Style/FrozenStringLiteralComment:
   Enabled: false
 
-Style/GlobalStdStream:
-  Enabled: false
-
 Style/GuardClause:
   Enabled: false
 
@@ -161,9 +123,6 @@ Style/InverseMethods:
 Style/MethodCallWithoutArgsParentheses:
   Enabled: false
 
-Style/MutableConstant:
-  Enabled: false
-
 Style/NumericLiteralPrefix:
   Enabled: false
 
@@ -176,15 +135,9 @@ Style/RaiseArgs:
 Style/SafeNavigation:
   Enabled: false
 
-Style/SelfAssignment:
-  Enabled: false
-
 Style/SpecialGlobalVars:
   Enabled: false
 
-Style/StderrPuts:
-  Enabled: false
-
 Style/StringLiterals:
   Enabled: false
 
diff --git a/gush.gemspec b/gush.gemspec
index 14d1551..1cdc4f7 100644
--- a/gush.gemspec
+++ b/gush.gemspec
@@ -1,5 +1,4 @@
-# coding: utf-8
-lib = File.expand_path('../lib', __FILE__)
+lib = File.expand_path('lib', __dir__)
 $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 
 require_relative 'lib/gush/version'
diff --git a/lib/gush/cli.rb b/lib/gush/cli.rb
index 681ed80..ef56436 100644
--- a/lib/gush/cli.rb
+++ b/lib/gush/cli.rb
@@ -101,7 +101,7 @@ def viz(class_or_id)
         begin
           workflow = class_or_id.constantize.new
         rescue NameError => e
-          STDERR.puts Paint["'#{class_or_id}' is not a valid workflow class or id", :red]
+          warn Paint["'#{class_or_id}' is not a valid workflow class or id", :red]
           exit 1
         end
       end
diff --git a/lib/gush/cli/overview.rb b/lib/gush/cli/overview.rb
index ac82d9d..0372e6e 100644
--- a/lib/gush/cli/overview.rb
+++ b/lib/gush/cli/overview.rb
@@ -34,6 +34,7 @@ def jobs_list(jobs)
       end
 
       private
+
       def rows
         [].tap do |rows|
           columns.each_pair do |name, value|
@@ -91,6 +92,7 @@ def job_to_list_element(job)
 
       def jobs_by_type(type)
         return sorted_jobs if type == :all
+
         jobs.select{|j| j.public_send("#{type}?") }
       end
 
diff --git a/lib/gush/client.rb b/lib/gush/client.rb
index c8e36d6..8636b2f 100644
--- a/lib/gush/client.rb
+++ b/lib/gush/client.rb
@@ -95,7 +95,7 @@ def find_workflow(id)
         keys = redis.scan_each(match: "gush.jobs.#{id}.*")
 
         nodes = keys.each_with_object([]) do |key, array|
-          array.concat redis.hvals(key).map { |json| Gush::JSON.decode(json, symbolize_keys: true) }
+          array.concat(redis.hvals(key).map { |json| Gush::JSON.decode(json, symbolize_keys: true) })
         end
 
         workflow_from_hash(hash, nodes)
@@ -142,13 +142,13 @@ def destroy_job(workflow_id, job)
     end
 
     def expire_workflow(workflow, ttl=nil)
-      ttl = ttl || configuration.ttl
+      ttl ||= configuration.ttl
       redis.expire("gush.workflows.#{workflow.id}", ttl)
       workflow.jobs.each {|job| expire_job(workflow.id, job, ttl) }
     end
 
     def expire_job(workflow_id, job, ttl=nil)
-      ttl = ttl || configuration.ttl
+      ttl ||= configuration.ttl
       redis.expire("gush.jobs.#{workflow_id}.#{job.klass}", ttl)
     end
 
@@ -157,7 +157,7 @@ def enqueue_job(workflow_id, job)
       persist_job(workflow_id, job)
       queue = job.queue || configuration.namespace
       wait = job.wait
-      
+
       if wait.present?
         Gush::Worker.set(queue: queue, wait: wait).perform_later(*[workflow_id, job.name])
       else
diff --git a/lib/gush/graph.rb b/lib/gush/graph.rb
index d599816..46db8ad 100644
--- a/lib/gush/graph.rb
+++ b/lib/gush/graph.rb
@@ -4,7 +4,7 @@
 
 module Gush
   class Graph
-    attr_reader :workflow, :filename, :path, :start_node, :end_node
+    attr_reader :workflow, :filename, :start_node, :end_node
 
     def initialize(workflow, options = {})
       @workflow = workflow
@@ -32,7 +32,7 @@ def viz
       file_format = path.split('.')[-1]
       format = file_format if file_format.length == 3
 
-      Graphviz::output(@graph, path: path, format: format)
+      Graphviz.output(@graph, path: path, format: format)
     end
 
     def path
diff --git a/lib/gush/job.rb b/lib/gush/job.rb
index e432648..8705fb2 100644
--- a/lib/gush/job.rb
+++ b/lib/gush/job.rb
@@ -3,7 +3,7 @@ class Job
     attr_accessor :workflow_id, :incoming, :outgoing, :params,
       :finished_at, :failed_at, :started_at, :enqueued_at, :payloads,
       :klass, :queue, :wait
-    attr_reader :id, :klass, :output_payload, :params
+    attr_reader :id, :output_payload
 
     def initialize(opts = {})
       options = opts.dup
diff --git a/lib/gush/version.rb b/lib/gush/version.rb
index 3982b0b..ea85ec6 100644
--- a/lib/gush/version.rb
+++ b/lib/gush/version.rb
@@ -1,3 +1,3 @@
 module Gush
-  VERSION = '3.0.0'
+  VERSION = '3.0.0'.freeze
 end
diff --git a/lib/gush/worker.rb b/lib/gush/worker.rb
index 6578cd1..98cbd32 100644
--- a/lib/gush/worker.rb
+++ b/lib/gush/worker.rb
@@ -30,7 +30,7 @@ def perform(workflow_id, job_id)
 
     private
 
-    attr_reader :client, :workflow_id, :job, :configuration
+    attr_reader :workflow_id, :job
 
     def client
       @client ||= Gush::Client.new(Gush.configuration)
diff --git a/lib/gush/workflow.rb b/lib/gush/workflow.rb
index e00c77f..2ce97ff 100644
--- a/lib/gush/workflow.rb
+++ b/lib/gush/workflow.rb
@@ -2,7 +2,8 @@
 
 module Gush
   class Workflow
-    attr_accessor :id, :jobs, :stopped, :persisted, :arguments, :kwargs, :globals
+    attr_accessor :jobs, :stopped, :persisted, :arguments, :kwargs, :globals
+    attr_writer :id
 
     def initialize(*args, globals: nil, **kwargs)
       @id = id
@@ -55,7 +56,7 @@ def persist!
       client.persist_workflow(self)
     end
 
-    def expire! (ttl=nil)
+    def expire!(ttl=nil)
       client.expire_workflow(self, ttl)
     end
 
diff --git a/spec/features/integration_spec.rb b/spec/features/integration_spec.rb
index e7544d9..558e7f0 100644
--- a/spec/features/integration_spec.rb
+++ b/spec/features/integration_spec.rb
@@ -136,7 +136,7 @@ def perform
 
     class SummaryJob < Gush::Job
       def perform
-        output payloads.map { |payload| payload[:output] }
+        output(payloads.map { |payload| payload[:output] })
       end
     end
 
diff --git a/spec/gush/workflow_spec.rb b/spec/gush/workflow_spec.rb
index 720323d..9d095c9 100644
--- a/spec/gush/workflow_spec.rb
+++ b/spec/gush/workflow_spec.rb
@@ -137,21 +137,21 @@ def configure(*args)
       flow = Gush::Workflow.new
       flow.run(Gush::Job, params: { something: 1 })
       flow.save
-      expect(flow.jobs.first.params).to eq ({ something: 1 })
+      expect(flow.jobs.first.params).to eq({ something: 1 })
     end
 
     it "merges globals with params and passes them to the job, with job param taking precedence" do
       flow = Gush::Workflow.new(globals: { something: 2, global1: 123 })
       flow.run(Gush::Job, params: { something: 1 })
       flow.save
-      expect(flow.jobs.first.params).to eq ({ something: 1, global1: 123 })
+      expect(flow.jobs.first.params).to eq({ something: 1, global1: 123 })
     end
 
     it "allows passing wait param to the job" do
       flow = Gush::Workflow.new
       flow.run(Gush::Job, wait: 5.seconds)
       flow.save
-      expect(flow.jobs.first.wait).to eq (5.seconds)
+      expect(flow.jobs.first.wait).to eq(5.seconds)
     end
 
     context "when graph is empty" do
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 2e75290..a55bd4e 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -120,11 +120,11 @@ def job_with_id(job_name)
     clear_enqueued_jobs
     clear_performed_jobs
 
-    Gush.configure do |config|
-      config.redis_url        = REDIS_URL
-      config.gushfile         = GUSHFILE
-      config.locking_duration = defined?(locking_duration) ? locking_duration : 2
-      config.polling_interval = defined?(polling_interval) ? polling_interval : 0.3
+    Gush.configure do |c|
+      c.redis_url        = REDIS_URL
+      c.gushfile         = GUSHFILE
+      c.locking_duration = defined?(locking_duration) ? locking_duration : 2
+      c.polling_interval = defined?(polling_interval) ? polling_interval : 0.3
     end
   end