diff --git a/competition/serializers.py b/competition/serializers.py
index 655d8f9e..ee2fd43b 100644
--- a/competition/serializers.py
+++ b/competition/serializers.py
@@ -60,7 +60,7 @@ class Meta:
 
 @ts_interface(context='competition')
 class CompetitionSerializer(serializers.ModelSerializer):
-    competition_type = CompetitionTypeSerializer(many=False)
+    competition_type = CompetitionTypeSerializer(many=False, read_only=True)
     upcoming_or_current_event = serializers.SerializerMethodField(
         'get_upcoming_or_current')
     history_events = serializers.SerializerMethodField('get_history_events')
diff --git a/competition/tests.py b/competition/tests.py
index 023281ff..e3cbbdcd 100644
--- a/competition/tests.py
+++ b/competition/tests.py
@@ -337,7 +337,19 @@ def test_permission_get(self):
     def test_permission_update(self):
         ''' update permission OK'''
         self.check_permissions(self.URL_PREFIX + '/strom/', 'PUT',
-                               self.ALL_FORBIDDEN, {'start_year': 2020})
+                               self.ONLY_STROM_OK_RESPONSES,
+                               {
+                                   "id": 0,
+                                   "name": "STROM",
+                                   "slug": "strom",
+                                   "start_year": 1976,
+                                   "description": "popis",
+                                   "rules": "# Pravidlá",
+                                   "min_years_until_graduation": 0,
+                                   "sites": [
+                                       0
+                                   ]
+                               })
 
     def test_permission_create(self):
         ''' create permission OK'''