diff --git a/treeadmin/admin.py b/treeadmin/admin.py
index 1b31089..4ba3320 100644
--- a/treeadmin/admin.py
+++ b/treeadmin/admin.py
@@ -3,12 +3,14 @@
 from django.contrib.admin.views import main
 from django.db.models import Q
 from django.http import HttpResponse, HttpResponseBadRequest, HttpResponseForbidden, HttpResponseNotFound, HttpResponseServerError
-from django.utils import simplejson
 from django.utils.safestring import mark_safe
 from django.utils.translation import ugettext_lazy as _, ugettext
 
 from mptt.exceptions import InvalidMove
-
+try:
+    import simpljson as json
+except ImportError:
+    import json
 import logging
 
 
@@ -318,7 +320,7 @@ def _toggle_boolean(self, request):
                 d.append(b)
 
         # TODO: Shorter: [ y for x,y in zip(a,b) if x!=y ]
-        return HttpResponse(simplejson.dumps(d), mimetype="application/json")
+        return HttpResponse(json.dumps(d), mimetype="application/json")
 
     def get_changelist(self, request, **kwargs):
         return ChangeList
@@ -347,7 +349,7 @@ def changelist_view(self, request, extra_context=None, *args, **kwargs):
         extra_context = extra_context or {}
         extra_context['TREEADMIN_MEDIA_HOTLINKING'] = self.jquery_use_google_cdn
         extra_context['TREEADMIN_JQUERY_NO_CONFLICT'] = self.jquery_no_conflict
-        extra_context['tree_structure'] = mark_safe(simplejson.dumps(
+        extra_context['tree_structure'] = mark_safe(json.dumps(
             _build_tree_structure(self.model)))
 
         return super(TreeAdmin, self).changelist_view(request, extra_context, *args, **kwargs)