diff --git a/rest_auth/serializers.py b/rest_auth/serializers.py
index b645231..a438d39 100644
--- a/rest_auth/serializers.py
+++ b/rest_auth/serializers.py
@@ -3,8 +3,8 @@ from django.conf import settings
 from django.contrib.auth.forms import PasswordResetForm, SetPasswordForm
 from django.contrib.auth.tokens import default_token_generator
 from django.utils.http import urlsafe_base64_decode as uid_decoder
-from django.utils.translation import ugettext_lazy as _
-from django.utils.encoding import force_text
+from django.utils.translation import gettext_lazy as _
+from django.utils.encoding import force_str
 
 from rest_framework import serializers, exceptions
 from rest_framework.exceptions import ValidationError
@@ -205,7 +205,7 @@ class PasswordResetConfirmSerializer(serializers.Serializer):
 
         # Decode the uidb64 to uid to get User object
         try:
-            uid = force_text(uid_decoder(attrs['uid']))
+            uid = force_str(uid_decoder(attrs['uid']))
             self.user = UserModel._default_manager.get(pk=uid)
         except (TypeError, ValueError, OverflowError, UserModel.DoesNotExist):
             raise ValidationError({'uid': ['Invalid value']})
@@ -256,8 +256,7 @@ class PasswordChangeSerializer(serializers.Serializer):
         )
 
         if all(invalid_password_conditions):
-            err_msg = _("Your old password was entered incorrectly. Please enter it again.")
-            raise serializers.ValidationError(err_msg)
+            raise serializers.ValidationError('Invalid password')
         return value
 
     def validate(self, attrs):
diff --git a/rest_auth/urls.py b/rest_auth/urls.py
index 7a35e9b..1945519 100644
--- a/rest_auth/urls.py
+++ b/rest_auth/urls.py
@@ -1,4 +1,4 @@
-from django.conf.urls import url
+from django.urls import re_path 
 
 from rest_auth.views import (
     LoginView, LogoutView, UserDetailsView, PasswordChangeView,
@@ -7,14 +7,14 @@ from rest_auth.views import (
 
 urlpatterns = [
     # URLs that do not require a session or valid token
-    url(r'^password/reset/$', PasswordResetView.as_view(),
+    re_path(r'^password/reset/$', PasswordResetView.as_view(),
         name='rest_password_reset'),
-    url(r'^password/reset/confirm/$', PasswordResetConfirmView.as_view(),
+    re_path(r'^password/reset/confirm/$', PasswordResetConfirmView.as_view(),
         name='rest_password_reset_confirm'),
-    url(r'^login/$', LoginView.as_view(), name='rest_login'),
+    re_path(r'^login/$', LoginView.as_view(), name='rest_login'),
     # URLs that require a user to be logged in with a valid session / token.
-    url(r'^logout/$', LogoutView.as_view(), name='rest_logout'),
-    url(r'^user/$', UserDetailsView.as_view(), name='rest_user_details'),
-    url(r'^password/change/$', PasswordChangeView.as_view(),
+    re_path(r'^logout/$', LogoutView.as_view(), name='rest_logout'),
+    re_path(r'^user/$', UserDetailsView.as_view(), name='rest_user_details'),
+    re_path(r'^password/change/$', PasswordChangeView.as_view(),
         name='rest_password_change'),
 ]
diff --git a/rest_auth/views.py b/rest_auth/views.py
index 0a0a982..d436fdd 100644
--- a/rest_auth/views.py
+++ b/rest_auth/views.py
@@ -6,7 +6,7 @@ from django.conf import settings
 from django.contrib.auth import get_user_model
 from django.core.exceptions import ObjectDoesNotExist
 from django.utils.decorators import method_decorator
-from django.utils.translation import ugettext_lazy as _
+from django.utils.translation import gettext_lazy as _
 from django.views.decorators.debug import sensitive_post_parameters
 
 from rest_framework import status