diff --git a/DESIGN.textile b/DESIGN.textile
index 336d85d9..559982e4 100644
--- a/DESIGN.textile
+++ b/DESIGN.textile
@@ -358,8 +358,8 @@ Here is an example:
 
 <pre lang="ruby">
 class UserSerializer < ActiveModel::Serializer
-  has_many :followed_posts, :key => :posts
-  has_one :owned_account, :key => :account
+  has_many :followed_posts, key: :posts
+  has_one :owned_account, key: :account
 end
 </pre>
 
@@ -370,8 +370,8 @@ to set it explicitly:
 
 <pre lang="ruby">
 class UserSerializer < ActiveModel::Serializer
-  has_many :followed_posts, :key => :posts, :serializer => CustomPostSerializer
-  has_one :owne_account, :key => :account, :serializer => PrivateAccountSerializer
+  has_many :followed_posts, key: :posts, serializer: CustomPostSerializer
+  has_one :owne_account, key: :account, serializer: PrivateAccountSerializer
 end
 </pre>
 
diff --git a/README.md b/README.md
index 117fd0d8..00880659 100644
--- a/README.md
+++ b/README.md
@@ -217,7 +217,7 @@ end
 ## Getting the old version
 
 If you find that your project is already relying on the old rails to_json
-change `render :json` to `render :json => @your_object.to_json`.
+change `render :json` to `render json: @your_object.to_json`.
 
 # Attributes and Associations
 
@@ -293,7 +293,7 @@ type of a computed attribute:
 
 ```ruby
 class PersonSerializer < ActiveModel::Serializer
-  attributes :first_name, :last_name, {:full_name => :string}
+  attributes :first_name, :last_name, {full_name: :string}
 
   def full_name
     "#{object.first_name} #{object.last_name}"
@@ -309,7 +309,7 @@ class PostSerializer < ActiveModel::Serializer
   attributes :id, :body
 
   # look up :subject on the model, but use +title+ in the JSON
-  attribute :subject, :key => :title
+  attribute :subject, key: :title
   has_many :comments
 end
 ```
@@ -318,7 +318,7 @@ If you would like to add meta information to the outputted JSON, use the `:meta`
 option:
 
 ```ruby
-render :json => @posts, :serializer => CustomArraySerializer, :meta => {:total => 10}
+render json: @posts, serializer: CustomArraySerializer, meta: {total: 10}
 ```
 
 The above usage of `:meta` will produce the following:
@@ -336,7 +336,7 @@ The above usage of `:meta` will produce the following:
 If you would like to change the meta key name you can use the `:meta_key` option:
 
 ```ruby
-render :json => @posts, :serializer => CustomArraySerializer, :meta => {:total => 10}, :meta_key => 'meta_object'
+render json: @posts, serializer: CustomArraySerializer, meta: {total: 10}, meta_key: 'meta_object'
 ```
 
 The above usage of `:meta_key` will produce the following:
@@ -388,7 +388,7 @@ class PostSerializer < ActiveModel::Serializer
 
   # only let the user see comments he created.
   def comments
-    object.comments.where(:created_by => current_user)
+    object.comments.where(created_by: current_user)
   end
 end
 ```
@@ -401,7 +401,7 @@ class PostSerializer < ActiveModel::Serializer
   attributes :id, :title, :body
 
   # look up comments, but use +my_comments+ as the key in JSON
-  has_many :comments, :key => :my_comments
+  has_many :comments, key: :my_comments
 end
 ```
 
@@ -439,8 +439,8 @@ end
 You may also use the `:serializer` option to specify a custom serializer class and the `:polymorphic` option to specify an association that is polymorphic (STI), e.g.:
 
 ```ruby
-  has_many :comments, :serializer => CommentShortSerializer
-  has_one :reviewer, :polymorphic => true
+  has_many :comments, serializer: CommentShortSerializer
+  has_one :reviewer, polymorphic: true
 ```
 
 Serializers are only concerned with multiplicity, and not ownership. `belongs_to` ActiveRecord associations can be included using `has_one` in your serializer.
@@ -528,7 +528,7 @@ You can specify that the data be included like this:
 
 ```ruby
 class PostSerializer < ActiveModel::Serializer
-  embed :ids, :include => true
+  embed :ids, include: true
 
   attributes :id, :title, :body
   has_many :comments
@@ -563,10 +563,10 @@ used to reference them:
 
 ```ruby
 class PostSerializer < ActiveModel::Serializer
-  embed :ids, :include => true
+  embed :ids, include: true
 
   attributes :id, :title, :body
-  has_many :comments, :key => :comment_ids, :root => :comment_objects
+  has_many :comments, key: :comment_ids, root: :comment_objects
 end
 ```
 
@@ -591,10 +591,10 @@ objects:
 
 ```ruby
 class PostSerializer < ActiveModel::Serializer
-  embed :ids, :include => true
+  embed :ids, include: true
 
   attributes :id, :title, :body
-  has_many :comments, :embed_key => :external_id
+  has_many :comments, embed_key: :external_id
 end
 ```
 
@@ -646,7 +646,7 @@ To be clear, it's not possible, yet, to do something like this:
 
 ```ruby
 class SomeController < ApplicationController
-  serialization_scope :current_admin, :except => [:index, :show]
+  serialization_scope :current_admin, except: [:index, :show]
 end
 ```
 
@@ -660,13 +660,13 @@ class CitiesController < ApplicationController
   def index
     @cities = City.all
 
-    render :json => @cities, :each_serializer => CitySerializer
+    render json: @cities, each_serializer: CitySerializer
   end
 
   def show
     @city = City.find(params[:id])
 
-    render :json => @city, :scope => current_admin, :scope_name => :current_admin
+    render json: @city, scope: current_admin, scope_name: :current_admin
   end
 end
 ```
diff --git a/cruft.md b/cruft.md
index 3de9d682..22cbf7d3 100644
--- a/cruft.md
+++ b/cruft.md
@@ -9,8 +9,8 @@ have a constant with a Hash of events:
 
 ```ruby
 INSTRUMENT = {
-  :serialize => :"serialize.serializer",
-  :associations => :"associations.serializer"
+  serialize: :"serialize.serializer",
+  associations: :"associations.serializer"
 }
 ```