diff --git a/django_plotly_dash/dash_wrapper.py b/django_plotly_dash/dash_wrapper.py
index 47ba4342..d506037c 100644
--- a/django_plotly_dash/dash_wrapper.py
+++ b/django_plotly_dash/dash_wrapper.py
@@ -437,7 +437,15 @@ def _fix_callback_item(self, item):
 
     def callback(self, output, inputs=[], state=[], events=[]): # pylint: disable=dangerous-default-value
         'Invoke callback, adjusting variable names as needed'
-        return super(WrappedDash, self).callback(self._fix_callback_item(output),
+
+        if isinstance(output, (list, tuple)):
+            fixed_outputs = [self._fix_callback_item(x) for x in output]
+            # Temporary check; can be removed once the library has been extended
+            raise NotImplementedError("django-plotly-dash cannot handle multiple callback outputs at present")
+        else:
+            fixed_outputs = self._fix_callback_item(output)
+
+        return super(WrappedDash, self).callback(fixed_outputs,
                                                  [self._fix_callback_item(x) for x in inputs],
                                                  [self._fix_callback_item(x) for x in state])
 
@@ -520,6 +528,7 @@ def index(self, *args, **kwargs):  # pylint: disable=unused-argument
         css = self._generate_css_dist_html()
         config = self._generate_config_html()
         metas = self._generate_meta_html()
+        renderer = self._generate_renderer()
         title = getattr(self, 'title', 'Dash')
         if self._favicon:
             import flask
@@ -537,14 +546,13 @@ def index(self, *args, **kwargs):  # pylint: disable=unused-argument
 '''
         index = self.interpolate_index(
             metas=metas, title=title, css=css, config=config,
-            scripts=scripts, app_entry=_app_entry, favicon=favicon)
+            scripts=scripts, app_entry=_app_entry, favicon=favicon,
+            renderer=renderer)
 
         return index
 
     def interpolate_index(self, **kwargs): #pylint: disable=arguments-differ
 
-        print("IN INTERPOLATE INDEX")
-
         if not self._return_embedded:
             resp = super(WrappedDash, self).interpolate_index(**kwargs)
             return resp
diff --git a/django_plotly_dash/version.py b/django_plotly_dash/version.py
index 56ca9c7f..52cfb928 100644
--- a/django_plotly_dash/version.py
+++ b/django_plotly_dash/version.py
@@ -23,4 +23,4 @@
 
 '''
 
-__version__ = "0.9.8"
+__version__ = "0.9.9"
diff --git a/django_plotly_dash/views.py b/django_plotly_dash/views.py
index 27148e14..810d3a39 100644
--- a/django_plotly_dash/views.py
+++ b/django_plotly_dash/views.py
@@ -90,8 +90,16 @@ def update(request, ident, stateless=False, **kwargs):
     if str(resp) == 'EDGECASEEXIT':
         return HttpResponse("")
 
-    return HttpResponse(resp.data,
-                        content_type=resp.mimetype)
+    # Change in returned value type
+    try:
+        rdata = resp.data
+        rtype = resp.mimetype
+    except:
+        rdata = resp
+        rtype = "application/json"
+
+    return HttpResponse(rdata,
+                        content_type=rtype)
 
 def main_view(request, ident, stateless=False, cache_id=None, **kwargs):
     'Main view for a dash app'
diff --git a/frozen_dev.txt b/frozen_dev.txt
index 4236a106..0c8a1191 100644
--- a/frozen_dev.txt
+++ b/frozen_dev.txt
@@ -6,35 +6,35 @@ astroid==2.0.4
 async-timeout==2.0.1
 atomicwrites==1.2.1
 attrs==18.2.0
-autobahn==18.9.2
+autobahn==18.8.2
 Automat==0.7.0
 Babel==2.6.0
-bleach==3.0.2
 certifi==2018.8.24
-cffi==1.11.5
 channels==2.1.3
 channels-redis==2.3.0
 chardet==3.0.4
-Click==7.0
-cmarkgfm==0.4.2
+click==6.7
 constantly==15.1.0
 coverage==4.5.1
 daphne==2.2.2
-dash==0.36
-dash-core-components==0.43
-dash-html-components==0.13.5
-dash-renderer==0.17
+dash==0.41.0
+dash-bootstrap-components==0.2.6
+dash-core-components==0.46.0
+dash-html-components==0.15.0
+dash-renderer==0.22.0
+dash-table==3.6.0
 decorator==4.3.0
-Django==2.1.2
+Django==2.1.1
 django-bootstrap4==0.0.7
--e git+https://github.com/delsim/django-plotly-dash.git@affccd8b280b2fdbc7f7e2d975b9cf4c7ace5f06#egg=django_plotly_dash
+django-pdb==0.6.2
+-e git+https://github.com/delsim/django-plotly-dash.git@883dbd9969a993cfb5a5b34c62b658f13ac0d613#egg=django_plotly_dash
 django-redis==4.9.0
 docopt==0.6.2
 docutils==0.14
 dpd-components==0.1.0
+dpd-static-support==0.0.2
 Flask==1.0.2
 Flask-Compress==1.4.0
-future==0.16.0
 grip==4.5.2
 hiredis==0.2.0
 hyperlink==18.0.0
@@ -49,13 +49,13 @@ jsonschema==2.6.0
 jupyter-core==4.4.0
 lazy-object-proxy==1.3.1
 livereload==2.5.2
-Markdown==3.0.1
+Markdown==2.6.11
 MarkupSafe==1.0
 mccabe==0.6.1
 more-itertools==4.3.0
 msgpack==0.5.6
 nbformat==4.4.0
-numpy==1.15.2
+numpy==1.15.1
 packaging==18.0
 pandas==0.23.4
 path-and-address==2.0.1
@@ -63,22 +63,20 @@ pathlib2==2.3.2
 pathtools==0.1.2
 pkg-resources==0.0.0
 pkginfo==1.4.2
-plotly==3.5.0
+plotly==3.4.2
 pluggy==0.7.1
 port-for==0.3.1
-py==1.7.0
-pycparser==2.19
+py==1.6.0
 Pygments==2.2.0
 PyHamcrest==1.9.0
 pylint==2.1.1
-pyparsing==2.2.2
-pytest==3.8.2
-pytest-cov==2.6.0
-pytest-django==3.4.3
+pyparsing==2.3.0
+pytest==3.7.4
+pytest-cov==2.5.1
+pytest-django==3.4.2
 python-dateutil==2.7.3
 pytz==2018.5
 PyYAML==3.13
-readme-renderer==22.0
 redis==2.10.6
 requests==2.19.1
 requests-toolbelt==0.8.0
@@ -89,16 +87,16 @@ Sphinx==1.8.1
 sphinx-autobuild==0.7.1
 sphinx-rtd-theme==0.4.2
 sphinxcontrib-websupport==1.1.0
-tornado==5.1.1
-tqdm==4.26.0
+tornado==5.1
+tqdm==4.25.0
 traitlets==4.3.2
-twine==1.12.1
+twine==1.11.0
 Twisted==18.7.0
 txaio==18.8.1
 typed-ast==1.1.0
 urllib3==1.23
 watchdog==0.9.0
-webencodings==0.5.1
 Werkzeug==0.14.1
+whitenoise==4.1.2
 wrapt==1.10.11
 zope.interface==4.5.0
diff --git a/requirements.txt b/requirements.txt
index baf08dac..c12bbb7a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,7 @@
-dash==0.38
-dash-core-components==0.43.1
-dash-html-components==0.13.5
-dash-renderer==0.19
+dash
+dash-core-components
+dash-html-components
+dash-renderer
 plotly
 dpd-components