diff --git a/.travis.yml b/.travis.yml
index 3f144ab..0e98ab0 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,6 @@
 cache: bundler
 language: ruby
 rvm:
-  - 2.0
   - 2.1
   - 2.2
   - 2.3.0
diff --git a/README.md b/README.md
index 12cccdd..fd2eac4 100644
--- a/README.md
+++ b/README.md
@@ -41,13 +41,13 @@ class AuthenticateUser
   include Interactor::Contracts
 
   expects do
-    attr(:email)    { |email| email.filled? }
-    attr(:password) { |password| password.filled? }
+    required(:email).filled
+    required(:password).filled
   end
 
   assures do
-    attr(:user)  { |user| user.filled? }
-    attr(:token) { |token| token.filled? }
+    required(:user).filled
+    required(:token).filled
   end
 
   def call
diff --git a/interactor-contracts.gemspec b/interactor-contracts.gemspec
index 2807716..a97e4df 100644
--- a/interactor-contracts.gemspec
+++ b/interactor-contracts.gemspec
@@ -18,7 +18,7 @@ Gem::Specification.new do |spec|
   spec.files += Dir["lib/**/*.rb"]
   spec.require_paths = ["lib"]
 
-  spec.add_dependency "dry-validation", "~> 0.7", "< 0.8"
+  spec.add_dependency "dry-validation"
   spec.add_dependency "interactor", "~> 3"
 
   spec.add_development_dependency "bundler", "~> 1.11"
diff --git a/lib/interactor/contracts.rb b/lib/interactor/contracts.rb
index cd9ec86..6d70b08 100644
--- a/lib/interactor/contracts.rb
+++ b/lib/interactor/contracts.rb
@@ -37,7 +37,7 @@ def assurances
       #     include Interactor::Contracts
       #
       #     assures do
-      #       attr(:person, &:filled?)
+      #       required(:person).filled
       #     end
       #
       #     def call
@@ -68,7 +68,7 @@ def default_violation_handler
       #     include Interactor::Contracts
       #
       #     expects do
-      #       attr(:name, &:filled?)
+      #       required(:name).filled
       #     end
       #
       #     def call
@@ -102,7 +102,7 @@ def expectations
       #     include Interactor::Contracts
       #
       #     expects do
-      #       attr(:name, &:filled?)
+      #       required(:name).filled
       #     end
       #
       #     on_violation do |violations|
@@ -164,7 +164,7 @@ def define_assurances_hook
 
         after do
           assurances = self.class.assurances.new
-          result = assurances.call(context)
+          result = assurances.call(context.to_h)
 
           unless result.success?
             violations = result.messages.map do |property, messages|
@@ -189,7 +189,7 @@ def define_expectations_hook
 
         before do
           expectations = self.class.expectations.new
-          result = expectations.call(context)
+          result = expectations.call(context.to_h)
 
           unless result.success?
             violations = result.messages.map do |property, messages|
diff --git a/spec/interactor/contracts_spec.rb b/spec/interactor/contracts_spec.rb
index 8ef6c4e..4e09634 100644
--- a/spec/interactor/contracts_spec.rb
+++ b/spec/interactor/contracts_spec.rb
@@ -16,7 +16,7 @@
         include Interactor::Contracts
 
         assures do
-          attr(:name).required
+          required(:name).filled
         end
 
         def call
@@ -36,11 +36,11 @@ def call
         include Interactor::Contracts
 
         assures do
-          attr(:first_name).required
+          required(:first_name).filled
         end
 
         assures do
-          attr(:last_name).required
+          required(:last_name).filled
         end
 
         def call
@@ -61,11 +61,11 @@ def call
         include Interactor::Contracts
 
         assures do
-          attr(:first_name).required
+          required(:first_name).filled
         end
 
         assures do
-          attr(:last_name).required
+          required(:last_name).filled
         end
 
         def call
@@ -87,7 +87,7 @@ def call
         include Interactor::Contracts
 
         expects do
-          attr(:name).required
+          required(:name).filled
         end
       end
 
@@ -101,11 +101,11 @@ def call
         include Interactor::Contracts
 
         expects do
-          attr(:first_name).required
+          required(:first_name).filled
         end
 
         expects do
-          attr(:last_name).required
+          required(:last_name).filled
         end
       end
 
@@ -124,11 +124,11 @@ def call
         include Interactor::Contracts
 
         expects do
-          attr(:first_name).required
+          required(:first_name).filled
         end
 
         expects do
-          attr(:last_name).required
+          required(:last_name).filled
         end
       end
 
@@ -142,7 +142,7 @@ def call
         include Interactor
         include Interactor::Contracts
 
-        expects { attr(:name).required }
+        expects { required(:name).filled }
 
         on_violation { |_| context[:message] = "Bilbo Baggins!" }
       end
@@ -158,7 +158,7 @@ def call
         include Interactor
         include Interactor::Contracts
 
-        assures { attr(:name).required }
+        assures { required(:name).filled }
 
         on_violation { |_| context[:message] = "Bilbo Baggins!" }
       end
@@ -174,7 +174,7 @@ def call
         include Interactor
         include Interactor::Contracts
 
-        expects { attr(:name).required }
+        expects { required(:name).filled }
 
         on_violation { |_| context[:silly] = "You did something silly." }
         on_violation { |_| context.fail!(:message => "Bilbo Baggins!") }
@@ -192,7 +192,7 @@ def call
         include Interactor
         include Interactor::Contracts
 
-        expects { attr(:name).required }
+        expects { required(:name).filled }
 
         on_violation { |_| context.fail!(:message => "Bilbo Baggins!") }
         on_violation { |_| context[:wont_be_set] = "Nope" }
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index cb6fd3c..8f572b3 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -1,5 +1,5 @@
-require "codeclimate-test-reporter"
-CodeClimate::TestReporter.start
+require 'simplecov'
+SimpleCov.start
 
 if ENV["COVERAGE"] || ENV["CI"]
   require "simplecov"