diff --git a/competition/serializers.py b/competition/serializers.py
index 031ca1cd..2d2e2076 100644
--- a/competition/serializers.py
+++ b/competition/serializers.py
@@ -1,6 +1,7 @@
 from django.contrib.auth.models import AnonymousUser
 from django_typomatic import ts_interface
 from rest_framework import serializers
+from rest_framework.request import Request
 
 from competition import models
 from competition.models import Event, Problem, RegistrationLink
@@ -138,7 +139,7 @@ class ProblemSerializer(serializers.ModelSerializer):
     class Meta:
         model = models.Problem
         fields = '__all__'
-        read_only_fields = ['series']
+        read_only_fields = ['series', 'submitted', 'num_comments']
 
     submitted = serializers.SerializerMethodField(
         'submitted_solution')
@@ -170,6 +171,29 @@ def submitted_solution(self, obj):
             return SolutionSerializer(solution).data
         return None
 
+    def update_image(self, problem: Problem):
+        request: Request = self.context.get('request')
+        if request:
+            if len(request.FILES) > 1:
+                raise ValueError('Úloha môže obsahovať iba 1 obrázok')
+            if len(request.FILES) == 1:
+                for name, file in request.FILES.items():
+                    if '.' not in name:
+                        raise ValueError('Nepodarilo sa zistiť formát súboru')
+                    extension = name.split('.')[-1]
+                    problem.image.save(
+                        f'problem_image_{problem.pk}.{extension}', file)
+
+    def create(self, validated_data):
+        problem: Problem = super().create(validated_data)
+        self.update_image(problem)
+        return problem
+
+    def update(self, instance: Problem, validated_data):
+        problem = super().update(instance, validated_data)
+        self.update_image(problem)
+        return problem
+
 
 @ts_interface(context='competition')
 class CommentSerializer(serializers.ModelSerializer):