diff --git a/CHANGELOG.md b/CHANGELOG.md
index d7e80c7eff..6566d3d0d6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.32.0 - 2018-12-07
+## Added
+- Support for .map file extension and dynamic (on demand) loading [#478](https://github.com/plotly/dash/pull/478)
+
 ## 0.31.1 - 2018-11-29
 ## Fixed
 - Fix `_imports_.py` indentation generation. [#473](https://github.com/plotly/dash/pull/473/files)
@@ -101,7 +105,7 @@
 - Take configs values from init or environ variables (Prefixed with `DASH_`). [#322](https://github.com/plotly/dash/pull/322)
 
 ## Fixed
-- Take `requests_pathname_prefix` config when creating scripts tags. 
+- Take `requests_pathname_prefix` config when creating scripts tags.
 - `requests/routes_pathname_prefix` must starts and end with `/`.
 - `requests_pathname_prefix` must ends with `routes_pathname_prefix`. If you supplied both `requests` and `routes` pathname before this update, make sure `requests_pathname_prefix` ends with the same value as `routes_pathname_prefix`.
 - `url_base_pathname` set both `requests/routes` pathname, cannot supply it with either `requests` or `routes` pathname prefixes.
diff --git a/dash/dash.py b/dash/dash.py
index 3beb789871..a75d4c4c21 100644
--- a/dash/dash.py
+++ b/dash/dash.py
@@ -359,9 +359,6 @@ def _collect_and_register_resources(self, resources):
         # for cache busting
         def _relative_url_path(relative_package_path='', namespace=''):
 
-            # track the registered packages
-            self.registered_paths[namespace].add(relative_package_path)
-
             module_path = os.path.join(
                 os.path.dirname(sys.modules[namespace].__file__),
                 relative_package_path)
@@ -378,11 +375,17 @@ def _relative_url_path(relative_package_path='', namespace=''):
 
         srcs = []
         for resource in resources:
+            is_dynamic_resource = resource.get('dynamic', False)
+
             if 'relative_package_path' in resource:
-                if isinstance(resource['relative_package_path'], str):
-                    srcs.append(_relative_url_path(**resource))
-                else:
-                    for rel_path in resource['relative_package_path']:
+                paths = resource['relative_package_path']
+                paths = [paths] if isinstance(paths, str) else paths
+
+                for rel_path in paths:
+                    self.registered_paths[resource['namespace']]\
+                        .add(rel_path)
+
+                    if not is_dynamic_resource:
                         srcs.append(_relative_url_path(
                             relative_package_path=rel_path,
                             namespace=resource['namespace']
@@ -492,7 +495,8 @@ def serve_component_suites(self, package_name, path_in_package_dist):
 
         mimetype = ({
             'js': 'application/JavaScript',
-            'css': 'text/css'
+            'css': 'text/css',
+            'map': 'application/json'
         })[path_in_package_dist.split('.')[-1]]
 
         headers = {
diff --git a/dash/resources.py b/dash/resources.py
index 603bd37afe..476ad33839 100644
--- a/dash/resources.py
+++ b/dash/resources.py
@@ -19,6 +19,8 @@ def _filter_resources(self, all_resources, dev_bundles=False):
         filtered_resources = []
         for s in all_resources:
             filtered_resource = {}
+            if 'dynamic' in s:
+                filtered_resource['dynamic'] = s['dynamic']
             if 'namespace' in s:
                 filtered_resource['namespace'] = s['namespace']
             if 'external_url' in s and not self.config.serve_locally:
diff --git a/dash/version.py b/dash/version.py
index 74f9490deb..2ef0c52ebf 100644
--- a/dash/version.py
+++ b/dash/version.py
@@ -1 +1 @@
-__version__ = '0.31.1'
+__version__ = '0.32.0'