diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4be6497..aff55f1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+2.2.0
+-----
+- feature: add constraint via url support
+
 2.1.0
 -----
 - feature: add builder drivers using stevedore
diff --git a/README.md b/README.md
index 7699744..d096df7 100644
--- a/README.md
+++ b/README.md
@@ -59,10 +59,11 @@ giftwrap is pretty simple. The basic flow is something like this:
 3. giftwrap will clone the git repo and git ref that you specify for each of the OpenStack projects
 4. giftwrap will find the closest Gerrit Change-Id and retrieve it's build logs
 5. From the build logs, giftwrap will find the pip dependencies used for that build and record them.
-6. A new virtualenv will be built with the pip dependencies found
-7. The OpenStack project code will be installed into the same virtualenv; but with locked pip dependencies
-8. giftwrap will check [devstack](https://devstack.org) for the system dependencies necessary for that project (to be done)
-9. An [fpm](https://github.com/jordansissel/fpm) package will be built from the intersection of the python install and system dependencies
+6. If configured, giftwrap will fetch a constraints file to use to constrain the versions of things installed.
+7. A new virtualenv will be built with the pip dependencies found
+8. The OpenStack project code will be installed into the same virtualenv; but with locked pip dependencies
+9. giftwrap will check [devstack](https://devstack.org) for the system dependencies necessary for that project (to be done)
+10. An [fpm](https://github.com/jordansissel/fpm) package will be built from the intersection of the python install and system dependencies
 
 DockerDockerDockerDockerDocker
 ------------------------------
diff --git a/examples/manifest.yml b/examples/manifest.yml
index e466aee..9386cf0 100644
--- a/examples/manifest.yml
+++ b/examples/manifest.yml
@@ -2,10 +2,12 @@
 settings:
   package_name_format: 'openstack-{{ project.name }}-{{ settings.version }}'
   build_type: package
-  version: '10.0-bbc1'
+  version: '2016.1-bbc1'
   base_path: '/opt/bbc/openstack-{{ settings.version }}'
   force_overwrite: true
+  constraints:
+    - 'https://raw.githubusercontent.com/openstack/requirements/stable/mitaka/upper-constraints.txt'
 
 projects:
   - name: glance
-    gitref: stable/juno
+    gitref: stable/mitaka
diff --git a/setup.cfg b/setup.cfg
index fda1028..3e8164f 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,6 +1,6 @@
 [metadata]
 name = python-giftwrap
-version = 2.1.0
+version = 2.2.0
 summary = giftwrap - A tool to build full-stack native system packages.
 description-file =
     README.md