diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9d6cba9..4274e08 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,7 @@
 ### 1.5.1 (Next)
 
 * Your contribution here.
+* [#74](https://github.com/ruby-grape/grape-active_model_serializers/pull/74): Add support for Sequel - [@drn](https://github.com/drn).
 * [#65](https://github.com/ruby-grape/grape-active_model_serializers/pull/65): Added Danger, PR linter - [@dblock](https://github.com/dblock).
 * [#63](https://github.com/ruby-grape/grape-active_model_serializers/pull/63): Pass adapter options through render - [@drn](https://github.com/drn).
 
diff --git a/Gemfile b/Gemfile
index 1423961..5ebdb78 100644
--- a/Gemfile
+++ b/Gemfile
@@ -10,5 +10,7 @@ else
 end
 
 group :test do
+  gem 'sqlite3'
+  gem 'sequel', '~> 4.37', require: false
   gem 'ruby-grape-danger', '~> 0.1.0', require: false
 end
diff --git a/lib/grape-active_model_serializers/serializer_resolver.rb b/lib/grape-active_model_serializers/serializer_resolver.rb
index b9949e3..13220a1 100644
--- a/lib/grape-active_model_serializers/serializer_resolver.rb
+++ b/lib/grape-active_model_serializers/serializer_resolver.rb
@@ -48,8 +48,9 @@ def resource_defined_class
       end
 
       def collection_class
-        return nil unless resource.respond_to?(:to_ary)
-        ActiveModel::Serializer.config.collection_serializer
+        if resource.respond_to?(:to_ary) || resource.respond_to?(:all)
+          ActiveModel::Serializer.config.collection_serializer
+        end
       end
 
       def namespace_inferred_class
@@ -84,8 +85,10 @@ def resource_namespace
       end
 
       def resource_class
-        if resource.respond_to?(:to_ary)
-          resource.try(:klass) || resource.compact.first.class
+        if resource.respond_to?(:klass)
+          resource.klass
+        elsif resource.respond_to?(:to_ary) || resource.respond_to?(:all)
+          resource.first.class
         else
           resource.class
         end
diff --git a/spec/integration/sequel_spec.rb b/spec/integration/sequel_spec.rb
new file mode 100644
index 0000000..e2d6d4b
--- /dev/null
+++ b/spec/integration/sequel_spec.rb
@@ -0,0 +1,68 @@
+require 'sequel'
+require 'spec_helper'
+
+describe 'Sequel Integration' do
+  before do
+    DB = Sequel.sqlite unless defined?(DB)
+    DB.create_table(:users) do
+      primary_key :id
+      String :name
+    end
+    ActiveModelSerializers.config.adapter = :json
+    app.format :json
+    app.formatter :json, Grape::Formatter::ActiveModelSerializers
+  end
+
+  after do
+    DB.drop_table(:users)
+    Object.send(:remove_const, :SequelUser)
+    Object.send(:remove_const, :SequelUserSerializer)
+  end
+
+  let!(:model) {
+    SequelUser = Class.new(Sequel::Model(:users)) do
+      include ActiveModel::Serialization
+      def self.model_name
+        'User'
+      end
+    end
+  }
+  let!(:serializer) {
+    SequelUserSerializer = Class.new(ActiveModel::Serializer) do
+      attributes :id, :name
+    end
+  }
+  let(:app) { Class.new(Grape::API) }
+
+  context 'collection' do
+    let!(:users) {
+      [
+        model.create(name: 'one'),
+        model.create(name: 'two')
+      ]
+    }
+
+    it 'renders' do
+      app.get('/users') { render SequelUser.dataset }
+      response = get '/users'
+      expect(JSON.parse(response.body)).to eq(
+        'users' => [
+          { 'id' => 1, 'name' => 'one' },
+          { 'id' => 2, 'name' => 'two' }
+        ]
+      )
+    end
+  end
+
+  context 'member' do
+    let!(:user) { model.create(name: 'name') }
+
+    it 'renders' do
+      app.get('/user/1') { render SequelUser.first }
+      response = get '/user/1'
+      expect(JSON.parse(response.body)).to eq(
+        'user' => { 'id' => 1, 'name' => 'name' }
+      )
+    end
+  end
+end