diff --git a/.gitignore b/.gitignore
index 483f81a..cbb29a0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -15,3 +15,4 @@ test/tmp
 test/version_tmp
 tmp
 /**/*.log
+.rubocop-*yml
diff --git a/CHANGES.md b/CHANGES.md
index a8bbd08..fc4aedc 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,3 +1,7 @@
+## 0.6.3
+
+* Require forwardable module from standard lib.
+
 ## 0.6.2
 
 * Fix Trace so it works with Ruby <= 2.4
diff --git a/README.md b/README.md
index 802f405..5f084e1 100644
--- a/README.md
+++ b/README.md
@@ -15,6 +15,6 @@ An operation can be used exaclty like an activity, including nesting, tracing, e
 
 ## Copyright
 
-Copyright (c) 2016 Nick Sutterer <apotonick@gmail.com>
+Copyright (c) 2016-2020 Nick Sutterer <apotonick@gmail.com>
 
 `trailblazer-operation` is released under the [MIT License](http://www.opensource.org/licenses/MIT).
diff --git a/lib/trailblazer/operation.rb b/lib/trailblazer/operation.rb
index 2b05130..5b8b002 100644
--- a/lib/trailblazer/operation.rb
+++ b/lib/trailblazer/operation.rb
@@ -1,10 +1,10 @@
+require 'forwardable'
 require "trailblazer/option"
 require "trailblazer/context"
 require "trailblazer/container_chain"
 
 require "trailblazer/activity/dsl/linear"
 
-
 module Trailblazer
   # DISCUSS: I don't know where else to put this. It's not part of the {Activity} concept
   class Activity
@@ -61,6 +61,8 @@ def self.pass_fast!; Activity::FastTrack::PassFast end
   end
 end
 
+require 'trailblazer/operation/version'
+
 require "trailblazer/operation/class_dependencies"
 require "trailblazer/operation/deprecated_macro" # TODO: remove in 2.2.
 
diff --git a/lib/trailblazer/operation/result.rb b/lib/trailblazer/operation/result.rb
index a04a490..6663b30 100644
--- a/lib/trailblazer/operation/result.rb
+++ b/lib/trailblazer/operation/result.rb
@@ -1,5 +1,3 @@
-require 'forwardable'
-
 class Trailblazer::Operation
   class Result
     # @param success Boolean validity of the result object
diff --git a/lib/trailblazer/operation/trace.rb b/lib/trailblazer/operation/trace.rb
index f8a8cc8..887396f 100644
--- a/lib/trailblazer/operation/trace.rb
+++ b/lib/trailblazer/operation/trace.rb
@@ -33,7 +33,7 @@ def initialize(result, stack)
         end
 
         def wtf
-          Trailblazer::Developer::Trace::Present.(@stack)
+          Developer::Trace::Present.(@stack)
         end
 
         def wtf?
diff --git a/lib/trailblazer/operation/version.rb b/lib/trailblazer/operation/version.rb
index 3952cb9..7061ba5 100644
--- a/lib/trailblazer/operation/version.rb
+++ b/lib/trailblazer/operation/version.rb
@@ -1,7 +1,5 @@
 module Trailblazer
-  module Version
-    module Operation
-      VERSION = "0.6.2"
-    end
+  class Operation
+    VERSION = "0.6.3"
   end
 end
diff --git a/test/step_test.rb b/test/step_test.rb
index 843019e..2d0df78 100644
--- a/test/step_test.rb
+++ b/test/step_test.rb
@@ -173,11 +173,12 @@ class Ii < I
   #-
   # not existent :name
   it do
-    assert_raises Trailblazer::Activity::DSL::Linear::Sequence::IndexError do
+    op = assert_raises Trailblazer::Activity::DSL::Linear::Sequence::IndexError do
       Class.new(Trailblazer::Operation) do
         step :a, before: "I don't exist!"
       end
-    end.inspect.must_equal %{#<Trailblazer::Activity::DSL::Linear::Sequence::IndexError: "I don't exist!">}
+    end
+    assert_match /<Trailblazer::Activity::DSL::Linear::Sequence::IndexError: "I don't exist!" is not a valid step ID. Did you mean any of these ?/, op.inspect
   end
 
   #---
diff --git a/trailblazer-operation.gemspec b/trailblazer-operation.gemspec
index ecccdd1..b152bde 100644
--- a/trailblazer-operation.gemspec
+++ b/trailblazer-operation.gemspec
@@ -4,7 +4,7 @@ require 'trailblazer/operation/version'
 
 Gem::Specification.new do |spec|
   spec.name          = "trailblazer-operation"
-  spec.version       = Trailblazer::Version::Operation::VERSION
+  spec.version       = Trailblazer::Operation::VERSION
   spec.authors       = ["Nick Sutterer"]
   spec.email         = ["apotonick@gmail.com"]
   spec.description   = %q(Trailblazer's operation object.)
@@ -14,7 +14,7 @@ Gem::Specification.new do |spec|
 
   spec.files         = `git ls-files`.split($/)
   spec.executables   = spec.files.grep(%r{^bin/}) { |f| File.basename(f) }
-  spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
+  spec.test_files    = spec.files.grep(%r{^(test)/})
   spec.require_paths = ["lib"]
 
   spec.add_dependency "trailblazer-activity-dsl-linear", ">= 0.2.6", "< 1.0.0"