diff --git a/magnum_ui/api/magnum.py b/magnum_ui/api/magnum.py
index 3784e408..9bdd5e32 100644
--- a/magnum_ui/api/magnum.py
+++ b/magnum_ui/api/magnum.py
@@ -223,11 +223,7 @@ def quotas_create(request, **kwargs):
 
 
 def quotas_update(request, project_id, resource, **kwargs):
-    new = _cleanup_params(QUOTA_CREATION_ATTRIBUTES, True, **kwargs)
-    old = magnumclient(request).quotas.get(project_id, resource).to_dict()
-    old = _cleanup_params(QUOTA_CREATION_ATTRIBUTES, False, **old)
-    patch = _create_patches(old, new)
-    return magnumclient(request).quotas.update(project_id, resource, patch)
+    return magnumclient(request).quotas.update(project_id, resource, kwargs)
 
 
 def quotas_delete(request, project_id, resource):
diff --git a/magnum_ui/api/rest/magnum.py b/magnum_ui/api/rest/magnum.py
index 477cca95..5e6af047 100644
--- a/magnum_ui/api/rest/magnum.py
+++ b/magnum_ui/api/rest/magnum.py
@@ -227,9 +227,9 @@ class Quota(generic.View):
         """
         params = request.DATA
         updated = magnum.quotas_update(
-            request, project_id, resource, **params)
+            request, **params)
         return rest_utils.CreatedResponse(
-            ('/api/container_infra/quotas/%s/%s' % project_id, resource),
+            ('/api/container_infra/quotas/%s/%s' % (project_id, resource)),
             updated.to_dict())
 
     @rest_utils.ajax(data_required=True)
diff --git a/magnum_ui/static/dashboard/container-infra/quotas/actions.module.js b/magnum_ui/static/dashboard/container-infra/quotas/actions.module.js
index 8ba4f946..bb8fa41f 100644
--- a/magnum_ui/static/dashboard/container-infra/quotas/actions.module.js
+++ b/magnum_ui/static/dashboard/container-infra/quotas/actions.module.js
@@ -33,6 +33,7 @@
     'horizon.framework.conf.resource-type-registry.service',
     'horizon.framework.util.i18n.gettext',
     'horizon.dashboard.container-infra.quotas.create.service',
+    'horizon.dashboard.container-infra.quotas.update.service',
     'horizon.dashboard.container-infra.quotas.delete.service',
     'horizon.dashboard.container-infra.quotas.resourceType'
   ];
@@ -41,6 +42,7 @@
     registry,
     gettext,
     createQuotaService,
+    updateQuotaService,
     deleteQuotaService,
     resourceType) {
 
@@ -66,6 +68,13 @@
       });
 
     quotaResourceType.itemActions
+      .append({
+        id: 'updateQuotaService',
+        service: updateQuotaService,
+        template: {
+          text: gettext('Update Quota')
+        }
+      })
       .append({
         id: 'deleteQuotaService',
         service: deleteQuotaService,
diff --git a/magnum_ui/static/dashboard/container-infra/quotas/update/update.service.js b/magnum_ui/static/dashboard/container-infra/quotas/update/update.service.js
new file mode 100644
index 00000000..d6c4539b
--- /dev/null
+++ b/magnum_ui/static/dashboard/container-infra/quotas/update/update.service.js
@@ -0,0 +1,106 @@
+/**
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License. You may obtain
+ * a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+
+(function() {
+  'use strict';
+
+  /**
+   * @ngdoc overview
+   * @name horizon.dashboard.container-infra.quotas.update.service
+   * @description Service for the container-infra quotas update modal
+   */
+  angular
+    .module('horizon.dashboard.container-infra.quotas')
+    .factory('horizon.dashboard.container-infra.quotas.update.service', updateService);
+
+  updateService.$inject = [
+    'horizon.app.core.openstack-service-api.magnum',
+    'horizon.app.core.openstack-service-api.policy',
+    'horizon.framework.util.actions.action-result.service',
+    'horizon.framework.util.i18n.gettext',
+    'horizon.framework.util.q.extensions',
+    'horizon.framework.widgets.form.ModalFormService',
+    'horizon.framework.widgets.toast.service',
+    'horizon.dashboard.container-infra.quotas.resourceType',
+    'horizon.dashboard.container-infra.quotas.workflow'
+  ];
+
+  function updateService(
+    magnum, policy, actionResult, gettext, $qExtensions, modal, toast, resourceType, workflow
+  ) {
+
+    var config;
+    var message = {
+      success: gettext('Quota %s/%s was successfully updated.')
+    };
+
+    var service = {
+      perform: perform,
+      allowed: allowed
+    };
+
+    return service;
+
+    //////////////
+
+    function perform(selected, $scope) {
+      config = workflow.init('update', gettext('Update Quota'), $scope);
+      config.model.id = selected.id;
+
+      // load current data
+      magnum.getQuota(selected.project_id, selected.resource).then(onLoad);
+      function onLoad(response) {
+        config.model.id = response.data.id
+          ? response.data.id : "";
+        config.model.project_id = response.data.project_id
+          ? response.data.project_id : "";
+        config.model.resource = response.data.resource
+          ? response.data.resource : "Cluster";
+        config.model.hard_limit = response.data.hard_limit
+          ? response.data.hard_limit : null;
+      }
+
+      return modal.open(config).then(submit);
+    }
+
+    function allowed() {
+      return $qExtensions.booleanAsPromise(true);
+    }
+
+    function submit(context) {
+      context.model = cleanNullProperties(context.model);
+      return magnum.updateQuota(context.model.project_id, context.model.resource, context.model)
+        .then(success, true);
+    }
+
+    function cleanNullProperties(model) {
+      // Initially clean fields that don't have any value.
+      // Not only "null", blank too.
+      for (var key in model) {
+        if (model.hasOwnProperty(key) && model[key] === null || model[key] === "") {
+          delete model[key];
+        }
+      }
+      return model;
+    }
+
+    function success(response) {
+      toast.add('success', interpolate(message.success, [
+        response.data.project_id, response.data.resource]));
+      return actionResult.getActionResult()
+        .updated(resourceType, response.data.id)
+        .result;
+    }
+  }
+})();
diff --git a/magnum_ui/static/dashboard/container-infra/quotas/update/update.service.spec.js b/magnum_ui/static/dashboard/container-infra/quotas/update/update.service.spec.js
new file mode 100644
index 00000000..16e71d6f
--- /dev/null
+++ b/magnum_ui/static/dashboard/container-infra/quotas/update/update.service.spec.js
@@ -0,0 +1,88 @@
+/**
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License. You may obtain
+ * a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+
+(function() {
+  'use strict';
+
+  describe('horizon.dashboard.container-infra.quotas.update.service', function() {
+
+    var service, $scope, $q, deferred, magnum;
+    var selected = {
+      id: 1
+    };
+    var model = {
+      id: 1,
+      project_id: "p1",
+      resource: "Cluster",
+      hard_limit: 1
+    };
+    var modal = {
+      open: function(config) {
+        config.model = model;
+        deferred = $q.defer();
+        deferred.resolve(config);
+        return deferred.promise;
+      }
+    };
+    var workflow = {
+      init: function (action, title) {
+        action = title;
+        return {model: model};
+      }
+    };
+
+    ///////////////////
+
+    beforeEach(module('horizon.app.core'));
+    beforeEach(module('horizon.framework'));
+    beforeEach(module('horizon.dashboard.container-infra.quotas'));
+
+    beforeEach(module(function($provide) {
+      $provide.value('horizon.dashboard.container-infra.quotas.workflow', workflow);
+      $provide.value('horizon.framework.widgets.form.ModalFormService', modal);
+    }));
+
+    beforeEach(inject(function($injector, _$rootScope_, _$q_) {
+      $q = _$q_;
+      $scope = _$rootScope_.$new();
+      service = $injector.get(
+        'horizon.dashboard.container-infra.quotas.update.service');
+      magnum = $injector.get('horizon.app.core.openstack-service-api.magnum');
+      deferred = $q.defer();
+      deferred.resolve({data: {id: 1, project_id: "p1", resource: "Cluster", hard_limit: 1}});
+      spyOn(magnum, 'getQuota').and.returnValue(deferred.promise);
+      spyOn(magnum, 'updateQuota').and.returnValue(deferred.promise);
+      spyOn(workflow, 'init').and.returnValue({model: model});
+      spyOn(modal, 'open').and.callThrough();
+    }));
+
+    it('should check the policy if the user is allowed to update quota', function() {
+      var allowed = service.allowed();
+      expect(allowed).toBeTruthy();
+    });
+
+    it('open the modal', inject(function($timeout) {
+      service.perform(selected, $scope);
+
+      expect(workflow.init).toHaveBeenCalled();
+
+      expect(modal.open).toHaveBeenCalledWith({model: model});
+
+      $timeout.flush();
+      $scope.$apply();
+
+      expect(magnum.updateQuota).toHaveBeenCalled();
+    }));
+  });
+})();