diff --git a/tournaments/views.py b/tournaments/views.py
index 453c55c..ceb77fa 100644
--- a/tournaments/views.py
+++ b/tournaments/views.py
@@ -411,7 +411,11 @@ def activate(request, uidb64, token):
     if user is not None and account_activation_token.check_token(user, token):
         user.is_active = True
         user.save()
-        login(request, user)
+
+        # Specify the authentication backend when logging in
+        from django.contrib.auth import login
+        login(request, user, backend='django.contrib.auth.backends.ModelBackend')
+
         next_url = request.GET.get('next', '/')
         return redirect(next_url)
     else:
@@ -724,11 +728,14 @@ def my_tournaments(request):
         'user_name': user.username
     })
 
-class ProfileUpdateView(UpdateView):
+from django.contrib.auth.mixins import LoginRequiredMixin
+
+class ProfileUpdateView(LoginRequiredMixin, UpdateView):
     model = CustomUser
     form_class = ProfileUpdateForm
     template_name = 'profile.html'
     success_url = reverse_lazy('profile')
+    login_url = '/login/'  # Specify where to redirect if user is not logged in
 
     def get_object(self, queryset=None):
         return self.request.user