diff --git a/lib/mailup/console/list.rb b/lib/mailup/console/list.rb
index 4c154e9..de5e8d0 100644
--- a/lib/mailup/console/list.rb
+++ b/lib/mailup/console/list.rb
@@ -151,6 +151,19 @@ def recipient_groups(recipient_id, params = {})
         @api.get("#{@api.path}/List/#{@id}/Recipient/#{recipient_id}/Groups", params: params)
       end
 
+      # Delete all recipients in the specified group in this list
+      #
+      # @param [Integer] group_id The ID of the group.
+      #
+      # @return [JSON] Results and data including:
+      #   * Removed [Integer]
+      #
+      # @see http://help.mailup.com/display/mailupapi/Manage+Lists+and+Groups#ManageListsandGroups-Removerecipientsfromagroup(bulkremovalfromagroup)
+      #
+      def delete_group_recipients(group_id)
+        @api.delete("#{@api.path}/List/#{@id}/Group/#{group_id}/Recipients")
+      end
+
       # Retrieve pending recipients in the specified list.
       #
       # @param [Hash] params Optional params or filters:
diff --git a/mailup.gemspec b/mailup.gemspec
index 3166ad6..4c7c0b0 100644
--- a/mailup.gemspec
+++ b/mailup.gemspec
@@ -19,7 +19,7 @@ Gem::Specification.new do |gem|
   gem.test_files    = gem.files.grep(%r{^(test|spec|features)/})
   gem.require_paths = ["lib"]
 
-  gem.add_runtime_dependency 'oauth2', '~> 0.9', '>= 0.9.2'
+  gem.add_runtime_dependency 'oauth2', '~> 1.4', '>= 1.4'
 
   gem.add_development_dependency "rspec"
   gem.add_development_dependency "rake"
diff --git a/spec/mailup/console/list_spec.rb b/spec/mailup/console/list_spec.rb
index 6edf5b4..f58847f 100644
--- a/spec/mailup/console/list_spec.rb
+++ b/spec/mailup/console/list_spec.rb
@@ -37,6 +37,11 @@
     @mailup.console.list(1).recipient_groups(2)
   end
 
+  it "should fire the correct DELETE request for delete_group_recipients" do
+    @mailup.console.list(1).api.should_receive(:delete).with("#{@mailup.console.list(1).api.path}/List/1/Group/1/Recipients")
+    @mailup.console.list(1).delete_group_recipients(1)
+  end
+
   it "should fire the correct GET request for attachments" do
     @mailup.console.list(1).api.should_receive(:get).with("#{@mailup.console.list(1).api.path}/List/1/Email/2/Attachment", {params: {}})
     @mailup.console.list(1).attachments(2)