diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 5b9ba024..df59bb08 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -31,7 +31,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
         with:
-          python-version: '3.8'
+          python-version: '3.9'
       - uses: actions/setup-node@v4
         with:
           node-version: '12'
diff --git a/.github/workflows/code-quality.yml b/.github/workflows/code-quality.yml
index d6968e25..c7da6b2c 100644
--- a/.github/workflows/code-quality.yml
+++ b/.github/workflows/code-quality.yml
@@ -11,7 +11,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
         with:
-          python-version: '3.8'
+          python-version: '3.9'
       - uses: isort/isort-action@v1
         with:
           requirementsFiles: requirements/dev.txt
@@ -26,7 +26,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
         with:
-          python-version: '3.8'
+          python-version: '3.9'
       - name: Install dependencies
         run: |
           pip install -r requirements/dev.txt
diff --git a/.github/workflows/quick-start.yml b/.github/workflows/quick-start.yml
index b7230775..e3cf9353 100644
--- a/.github/workflows/quick-start.yml
+++ b/.github/workflows/quick-start.yml
@@ -4,7 +4,7 @@ on: [push]
 
 jobs:
   run:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
       - name: Download docker-compose file
diff --git a/src/objects/api/kanalen.py b/src/objects/api/kanalen.py
index fbb2462d..2ac56ccf 100644
--- a/src/objects/api/kanalen.py
+++ b/src/objects/api/kanalen.py
@@ -1,5 +1,4 @@
 from collections import defaultdict
-from typing import Dict
 
 from django.conf import settings
 from django.db import models
@@ -21,7 +20,7 @@ def __init__(
         # check that we're refering to existing fields
         self.kenmerken = kenmerken or ()
 
-    def get_kenmerken(self, obj: models.Model, data: Dict = None) -> Dict:
+    def get_kenmerken(self, obj: models.Model, data: dict = None) -> dict:
         data = data or {}
         return {
             kenmerk: data.get("type") or obj.object.object_type.url
diff --git a/src/objects/api/utils.py b/src/objects/api/utils.py
index b3c94da0..3b5330e4 100644
--- a/src/objects/api/utils.py
+++ b/src/objects/api/utils.py
@@ -1,5 +1,5 @@
 from datetime import date
-from typing import Dict, Union
+from typing import Union
 
 from djchoices import DjangoChoices
 
@@ -47,7 +47,7 @@ def display_choice_values_for_help_text(choices: DjangoChoices) -> str:
     return "\n".join(items)
 
 
-def merge_patch(target: JSONValue, patch: JSONValue) -> Dict[str, JSONValue]:
+def merge_patch(target: JSONValue, patch: JSONValue) -> dict[str, JSONValue]:
     """Merge two objects together recursively.
 
     This is inspired by https://datatracker.ietf.org/doc/html/rfc7396 - JSON Merge Patch,
diff --git a/src/objects/typing.py b/src/objects/typing.py
index 0264e153..1ffa8c1a 100644
--- a/src/objects/typing.py
+++ b/src/objects/typing.py
@@ -1,7 +1,7 @@
-from typing import Dict, List, Union
+from typing import Union
 
 JSONPrimitive = Union[str, int, None, float, bool]
 
-JSONValue = Union[JSONPrimitive, "JSONObject", List["JSONValue"]]
+JSONValue = Union[JSONPrimitive, "JSONObject", list["JSONValue"]]
 
-JSONObject = Dict[str, JSONValue]
+JSONObject = dict[str, JSONValue]
diff --git a/src/objects/utils/autoschema.py b/src/objects/utils/autoschema.py
index 061dce39..bd12b493 100644
--- a/src/objects/utils/autoschema.py
+++ b/src/objects/utils/autoschema.py
@@ -1,5 +1,3 @@
-from typing import List
-
 from django.conf import settings
 from django.utils.translation import gettext_lazy as _
 
@@ -119,7 +117,7 @@ def get_content_type_headers(self) -> list:
             )
         ]
 
-    def get_fields_params(self) -> List[OpenApiParameter]:
+    def get_fields_params(self) -> list[OpenApiParameter]:
         if self.method != "GET":
             return []
 
diff --git a/src/objects/utils/serializers.py b/src/objects/utils/serializers.py
index 7cf75a48..c7c2aaa1 100644
--- a/src/objects/utils/serializers.py
+++ b/src/objects/utils/serializers.py
@@ -1,6 +1,5 @@
 import logging
 from collections import defaultdict
-from typing import Dict, List, Tuple
 
 from glom import SKIP, GlomError, glom
 from rest_framework import fields, serializers
@@ -35,13 +34,13 @@ def build_spec_field(spec, name, value, ui):
         spec[name] = value if ui else spec_val
 
 
-def get_field_names(data: Dict[str, fields.Field]) -> List[str]:
+def get_field_names(data: dict[str, fields.Field]) -> list[str]:
     """return list of names for all serializer fields. Supports nesting"""
     names_and_sources = get_field_names_and_sources(data)
     return [name for name, source in names_and_sources]
 
 
-def get_field_names_and_sources(data: Dict[str, fields.Field]) -> List[Tuple[str, str]]:
+def get_field_names_and_sources(data: dict[str, fields.Field]) -> list[tuple[str, str]]:
     """return list of (name, source) for all serializer fields. Supports nesting"""
     names_and_sources = []
     for key, value in data.items():