diff --git a/.travis.yml b/.travis.yml
index 0b15b55..9c20921 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -18,8 +18,9 @@ python:
   - "3.7"
 
 env:
-  - DJANGO="django>=2.2,<2.3"
-  - DJANGO="django>=3.0,<3.1"
+  - DJANGO="django~=2.2"
+  - DJANGO="django~=3.0"
+  - DJANGO="django~=3.1"
 
 branches:
   only:
diff --git a/README.rst b/README.rst
index 36ef1b2..2981379 100644
--- a/README.rst
+++ b/README.rst
@@ -52,7 +52,7 @@ Reusable django-app for storing GIS and indoor coordinates of objects.
 Dependencies
 ------------
 
-* Python >= 3.5
+* Python >= 3.6
 * GeoDjango (`see GeoDjango Install Instructions <https://docs.djangoproject.com/en/dev/ref/contrib/gis/install/#requirements>`_)
 * One of the databases supported by GeoDjango
 
diff --git a/django_loci/base/admin.py b/django_loci/base/admin.py
index 7b7913e..08996d9 100644
--- a/django_loci/base/admin.py
+++ b/django_loci/base/admin.py
@@ -172,8 +172,11 @@ class Media:
         js = (
             'admin/js/jquery.init.js',
             'django-loci/js/loci.js',
+            'django-loci/js/floorplan-widget.js',
         )
-        css = {'all': ('django-loci/css/loci.css',)}
+        css = {
+            'all': ('django-loci/css/loci.css', 'django-loci/css/floorplan-widget.css')
+        }
 
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
diff --git a/django_loci/widgets.py b/django_loci/widgets.py
index e78a8be..cb3c075 100644
--- a/django_loci/widgets.py
+++ b/django_loci/widgets.py
@@ -1,11 +1,9 @@
 import logging
 
 from django import forms
-from django.templatetags.static import static
 from leaflet.forms.widgets import LeafletWidget as BaseLeafletWidget
 
 logger = logging.getLogger(__name__)
-_floorplan_css = {'all': (static('django-loci/css/floorplan-widget.css'),)}
 
 
 class ImageWidget(forms.FileInput):
@@ -36,11 +34,6 @@ def get_context(self, name, value, attrs):
                 logger.error(msg.format(value.name))
         return c
 
-    @property
-    def media(self):
-        css = _floorplan_css
-        return forms.Media(css=css)
-
 
 class FloorPlanWidget(forms.TextInput):
     """
@@ -49,12 +42,6 @@ class FloorPlanWidget(forms.TextInput):
 
     template_name = 'admin/widgets/floorplan.html'
 
-    @property
-    def media(self):
-        js = (static('django-loci/js/floorplan-widget.js'),)
-        css = _floorplan_css
-        return forms.Media(js=js, css=css)
-
 
 class LeafletWidget(BaseLeafletWidget):
     include_media = True
diff --git a/requirements-test.txt b/requirements-test.txt
index ae97802..41a08aa 100644
--- a/requirements-test.txt
+++ b/requirements-test.txt
@@ -3,4 +3,4 @@ attrs>=17.4.0
 pytest-django>=3.4.2,<3.10.0
 pytest-asyncio>=0.10.0,<0.15.0
 pytest-cov>=2.7.0,<2.11.0
-openwisp-utils[qa]~=0.5.1
+openwisp-utils[qa]~=0.6.0
diff --git a/requirements.txt b/requirements.txt
index 8447151..3072d6a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
-django>=2.2,<3.1
+django>=2.2,<3.2
 django-leaflet>=0.23,<0.28
-channels>=2.1.3,<2.5.0
+channels>=2.3.0,<2.5.0
 Pillow~=7.2.0
-openwisp-utils~=0.5.1
+openwisp-utils~=0.6.0