diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 5fc192b..c8a348d 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -25,7 +25,7 @@ jobs:
       DATABASE_URL: postgresql://postgres:postgres@localhost:5432/test_db
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7.0.1
 
       - name: Install uv
         uses: astral-sh/setup-uv@v10.2.0
diff --git a/Dockerfile b/Dockerfile
index 901f47b..3f07089 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,9 +1,9 @@
-# syntax=docker/dockerfile:1.21.0
+# syntax=docker/dockerfile:1.27.0
 
 # ---- builder: install Python deps into an isolated venv via uv ----
 FROM python:3.13-slim AS builder
 
-COPY --from=ghcr.io/astral-sh/uv:0.12.1 /uv /uvx /usr/local/bin/
+COPY --from=ghcr.io/astral-sh/uv:0.12.19 /uv /uvx /usr/local/bin/
 
 ENV UV_LINK_MODE=copy \
     UV_PROJECT_ENVIRONMENT=/opt/venv \
diff --git a/mise.toml b/mise.toml
index 8911f2a..d0daeac 100644
--- a/mise.toml
+++ b/mise.toml
@@ -1,4 +1,4 @@
 [tools]
 python = "3.13"
-task = "3.50.0"
-uv = "0.12.1"
+task = "3.53.1"
+uv = "0.12.19"
diff --git a/pyproject.toml b/pyproject.toml
index a3f43f9..bd82add 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,44 +4,44 @@ version = "0.1.0"
 description = "Python Ireland website (python.ie / pycon.ie), built with Django and Wagtail CMS"
 requires-python = "==3.13.*"
 dependencies = [
-    "boto3",
-    "colander",
-    "defusedxml",
-    "delorean",
-    "dj-database-url",
-    "dj-static",
-    "django<6.1", # pinned to the 6.0.x branch, matches the currently deployed version
-    "django-compressor",
-    "django-extensions",
-    "django-libsass",
-    "django-modelcluster",
-    "django-storages",
-    "django-taggit",
-    "gunicorn",
-    "pandas",
-    "psycopg[binary]",
-    "pydantic",
-    "python-dateutil",
-    "pytz",
-    "redis",
-    "requests>=2.32.5",
-    "wagtail>=7.3.2,<7.4",
-    "whitenoise",
-    "willow",
+    "boto3>=1.43.102",
+    "colander>=2.0",
+    "defusedxml>=0.7.1",
+    "delorean>=2.0.0",
+    "dj-database-url>=3.1.2",
+    "dj-static>=0.0.6",
+    "django>=6.0.8,<6.1", # pinned to the 6.0.x branch, matches the currently deployed version
+    "django-compressor>=4.6.0",
+    "django-extensions>=4.1",
+    "django-libsass>=0.9",
+    "django-modelcluster>=6.5",
+    "django-storages>=1.14.6",
+    "django-taggit>=6.1.0",
+    "gunicorn>=26.2.0",
+    "pandas>=3.0.6",
+    "psycopg[binary]>=3.3.6",
+    "pydantic>=2.13.5",
+    "python-dateutil>=2.9.0.post0",
+    "pytz>=2026.4",
+    "redis>=8.1.0",
+    "requests>=2.34.2",
+    "wagtail>=7.3.4,<7.4",
+    "whitenoise>=6.12.0",
+    "willow>=1.12.0",
 ]
 
 [dependency-groups]
 dev = [
-    "coverage",
-    "django-debug-toolbar",
-    "fakeredis",
-    "isort",
-    "model_mommy",
-    "pip-audit",
-    "pipdeptree",
-    "ruff==0.15.16", # pinned: 0.16 changes the default lint rule set
-    "uv",
-    "wagtail-factories",
+    "coverage>=7.16.1",
+    "django-debug-toolbar>=8.0.0",
+    "fakeredis>=2.38.0",
+    "isort>=9.0.1",
+    "model_mommy>=2.0.0",
+    "pip-audit>=2.10.1",
+    "pipdeptree>=4.2.5",
+    "ruff==0.16.9", # pinned: ruff minor releases change the default lint rule set
+    "uv>=0.12.19",
+    "wagtail-factories>=4.5.0",
 ]
 
 [tool.uv]
@@ -50,6 +50,11 @@ package = false
 [tool.ruff]
 target-version = "py313"
 
+[tool.ruff.lint]
+# RUF012 flags the Django/Wagtail class-attribute idioms (Meta, migrations
+# operations/dependencies, content_panels) that are never mutated.
+extend-ignore = ["RUF012"]
+
 [tool.coverage.run]
 branch = true
 source = ["pythonie"]
diff --git a/pythonie/core/factories.py b/pythonie/core/factories.py
index 1c57d2d..996fe38 100644
--- a/pythonie/core/factories.py
+++ b/pythonie/core/factories.py
@@ -1,12 +1,12 @@
 import factory
+import wagtail_factories
 from django.utils import timezone
 from factory.django import DjangoModelFactory
-import wagtail_factories
-
-from core.models import HomePage, SimplePage
 from meetups.models import Meetup
 from sponsors.models import SponsorshipLevel
 
+from core.models import HomePage, SimplePage
+
 
 class SponsorshipLevelFactory(DjangoModelFactory):
     class Meta:
diff --git a/pythonie/core/migrations/0001_initial.py b/pythonie/core/migrations/0001_initial.py
index cd69e01..68ed801 100644
--- a/pythonie/core/migrations/0001_initial.py
+++ b/pythonie/core/migrations/0001_initial.py
@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 import modelcluster.fields
 import wagtail.fields
 from django.db import migrations, models
diff --git a/pythonie/core/migrations/0002_simplepage.py b/pythonie/core/migrations/0002_simplepage.py
index 3656081..579ec5a 100644
--- a/pythonie/core/migrations/0002_simplepage.py
+++ b/pythonie/core/migrations/0002_simplepage.py
@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 import wagtail.blocks
 import wagtail.fields
 import wagtail.images.blocks
diff --git a/pythonie/core/migrations/0003_media_in_simple_page.py b/pythonie/core/migrations/0003_media_in_simple_page.py
index 265ef9b..eb03e2b 100644
--- a/pythonie/core/migrations/0003_media_in_simple_page.py
+++ b/pythonie/core/migrations/0003_media_in_simple_page.py
@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 import wagtail.blocks
 import wagtail.embeds.blocks
 import wagtail.fields
diff --git a/pythonie/core/migrations/0004_auto_20150708_1416.py b/pythonie/core/migrations/0004_auto_20150708_1416.py
index a4b2b5d..482a3fd 100644
--- a/pythonie/core/migrations/0004_auto_20150708_1416.py
+++ b/pythonie/core/migrations/0004_auto_20150708_1416.py
@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 import wagtail.blocks
 import wagtail.embeds.blocks
 import wagtail.fields
diff --git a/pythonie/core/migrations/0005_auto_20150726_1416.py b/pythonie/core/migrations/0005_auto_20150726_1416.py
index 658a02a..6da9bc5 100644
--- a/pythonie/core/migrations/0005_auto_20150726_1416.py
+++ b/pythonie/core/migrations/0005_auto_20150726_1416.py
@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from django.db import migrations, models
 
 
diff --git a/pythonie/core/migrations/0006_homepagesponsorrelationship.py b/pythonie/core/migrations/0006_homepagesponsorrelationship.py
index a3b4e43..649d745 100644
--- a/pythonie/core/migrations/0006_homepagesponsorrelationship.py
+++ b/pythonie/core/migrations/0006_homepagesponsorrelationship.py
@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from django.db import migrations, models
 
 
diff --git a/pythonie/core/migrations/0007_homepage_sponsors.py b/pythonie/core/migrations/0007_homepage_sponsors.py
index 0c9022f..77ae1d1 100644
--- a/pythonie/core/migrations/0007_homepage_sponsors.py
+++ b/pythonie/core/migrations/0007_homepage_sponsors.py
@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from django.db import migrations, models
 
 
diff --git a/pythonie/core/migrations/0008_auto_20150821_2230.py b/pythonie/core/migrations/0008_auto_20150821_2230.py
index c3f927f..d9b42ea 100644
--- a/pythonie/core/migrations/0008_auto_20150821_2230.py
+++ b/pythonie/core/migrations/0008_auto_20150821_2230.py
@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 import wagtail.blocks
 import wagtail.embeds.blocks
 import wagtail.fields
diff --git a/pythonie/core/migrations/0009_auto_20160703_0857.py b/pythonie/core/migrations/0009_auto_20160703_0857.py
index e068472..c4b08c5 100644
--- a/pythonie/core/migrations/0009_auto_20160703_0857.py
+++ b/pythonie/core/migrations/0009_auto_20160703_0857.py
@@ -1,6 +1,4 @@
-# -*- coding: utf-8 -*-
 # Generated by Django 1.9.7 on 2016-07-03 08:57
-from __future__ import unicode_literals
 
 from django.db import migrations, models
 
diff --git a/pythonie/core/models.py b/pythonie/core/models.py
index 77b92fe..f38bf47 100644
--- a/pythonie/core/models.py
+++ b/pythonie/core/models.py
@@ -1,5 +1,3 @@
-from __future__ import unicode_literals
-
 import logging
 
 from django.db import models
@@ -62,7 +60,7 @@ class PageSegment(models.Model):
     ]
 
     def __str__(self):
-        return "{!s} on {!s}".format(self.title, self.homepage_segments.first())
+        return f"{self.title!s} on {self.homepage_segments.first()!s}"
 
 
 class HomePageSegment(Orderable, models.Model):
@@ -84,7 +82,7 @@ class Meta:
     ]
 
     def __str__(self):
-        return "{!s} Segment".format(self.homepage)
+        return f"{self.homepage!s} Segment"
 
 
 class HomePageSponsorRelationship(models.Model):
@@ -97,9 +95,7 @@ class HomePageSponsorRelationship(models.Model):
     level = models.ForeignKey(SponsorshipLevel, on_delete=models.CASCADE)
 
     def __repr__(self):
-        return "{} {} {}".format(
-            self.sponsor.name, self.homepage.title, self.level.name
-        )
+        return f"{self.sponsor.name} {self.homepage.title} {self.level.name}"
 
 
 class HomePage(Page, MeetupMixin, SponsorMixin):
diff --git a/pythonie/meetups/migrations/0001_initial.py b/pythonie/meetups/migrations/0001_initial.py
index 770973b..c034ba2 100644
--- a/pythonie/meetups/migrations/0001_initial.py
+++ b/pythonie/meetups/migrations/0001_initial.py
@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from django.db import migrations, models
 
 
diff --git a/pythonie/meetups/migrations/0002_add_meetup_sponsor_relationship.py b/pythonie/meetups/migrations/0002_add_meetup_sponsor_relationship.py
index f6516cf..f61a9ac 100644
--- a/pythonie/meetups/migrations/0002_add_meetup_sponsor_relationship.py
+++ b/pythonie/meetups/migrations/0002_add_meetup_sponsor_relationship.py
@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from django.db import migrations, models
 
 
diff --git a/pythonie/meetups/migrations/0003_remove_meetup_announced.py b/pythonie/meetups/migrations/0003_remove_meetup_announced.py
index 670368c..01ad1ec 100644
--- a/pythonie/meetups/migrations/0003_remove_meetup_announced.py
+++ b/pythonie/meetups/migrations/0003_remove_meetup_announced.py
@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from django.db import migrations
 
 
diff --git a/pythonie/meetups/migrations/0004_auto_20150705_1641.py b/pythonie/meetups/migrations/0004_auto_20150705_1641.py
index 95a709c..5103813 100644
--- a/pythonie/meetups/migrations/0004_auto_20150705_1641.py
+++ b/pythonie/meetups/migrations/0004_auto_20150705_1641.py
@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 import datetime
 
 from django.db import migrations, models
@@ -16,9 +13,7 @@ class Migration(migrations.Migration):
             model_name="meetup",
             name="updated",
             field=models.DateTimeField(
-                default=datetime.datetime(
-                    1970, 1, 1, 0, 0, tzinfo=datetime.timezone.utc
-                )
+                default=datetime.datetime(1970, 1, 1, 0, 0, tzinfo=datetime.UTC)
             ),
             preserve_default=True,
         ),
diff --git a/pythonie/meetups/migrations/0005_delete_meetupupdate.py b/pythonie/meetups/migrations/0005_delete_meetupupdate.py
index d046bd8..f516e5e 100644
--- a/pythonie/meetups/migrations/0005_delete_meetupupdate.py
+++ b/pythonie/meetups/migrations/0005_delete_meetupupdate.py
@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from django.db import migrations
 
 
diff --git a/pythonie/meetups/migrations/0006_auto_20160703_0857.py b/pythonie/meetups/migrations/0006_auto_20160703_0857.py
index f52facb..579805f 100644
--- a/pythonie/meetups/migrations/0006_auto_20160703_0857.py
+++ b/pythonie/meetups/migrations/0006_auto_20160703_0857.py
@@ -1,6 +1,4 @@
-# -*- coding: utf-8 -*-
 # Generated by Django 1.9.7 on 2016-07-03 08:57
-from __future__ import unicode_literals
 
 from django.db import migrations, models
 
diff --git a/pythonie/meetups/models.py b/pythonie/meetups/models.py
index 42af7e3..7cb7d77 100644
--- a/pythonie/meetups/models.py
+++ b/pythonie/meetups/models.py
@@ -1,9 +1,9 @@
 import logging
-from datetime import datetime
+from datetime import UTC, datetime
 
 from dateutil.relativedelta import relativedelta
-from delorean import Delorean
 from django.db import models
+from django.utils import timezone
 from sponsors.models import Sponsor
 from wagtail.snippets.models import register_snippet
 
@@ -38,9 +38,7 @@ class Meetup(models.Model):
     )
     time = models.DateTimeField()
     created = models.DateTimeField()
-    updated = models.DateTimeField(
-        default=Delorean(datetime(1970, 1, 1), timezone="UTC").datetime
-    )
+    updated = models.DateTimeField(default=datetime(1970, 1, 1, tzinfo=UTC))
 
     rsvps = models.IntegerField(default=0)
     maybe_rsvps = models.IntegerField(default=0)
@@ -57,7 +55,7 @@ def __str__(self):
 
     @classmethod
     def future_events(cls):
-        today = datetime.now()
+        today = timezone.now()
         return cls.objects.filter(time__gt=today).filter(
             time__lt=next_n_months(today, 3)
         )
diff --git a/pythonie/meetups/schema.py b/pythonie/meetups/schema.py
index 94ae813..5888e0a 100644
--- a/pythonie/meetups/schema.py
+++ b/pythonie/meetups/schema.py
@@ -1,12 +1,12 @@
-from datetime import datetime
+from datetime import UTC, datetime
 
 import colander
 from delorean import Delorean
 
 
 def int_to_datetime(value):
-    time = datetime.utcfromtimestamp(value / 1000)
-    return Delorean(time, timezone="UTC").shift("Europe/Dublin").datetime
+    time = datetime.fromtimestamp(value / 1000, tz=UTC)
+    return Delorean(time).shift("Europe/Dublin").datetime
 
 
 class Meetups(colander.MappingSchema):
diff --git a/pythonie/meetups/test_meetups.py b/pythonie/meetups/test_meetups.py
index bde8da8..ee6bd72 100644
--- a/pythonie/meetups/test_meetups.py
+++ b/pythonie/meetups/test_meetups.py
@@ -37,12 +37,12 @@ def test_create_meetup(self):
         self.assertIsNotNone(meetup.visibility)
 
     def test_next_n_months(self):
-        september = datetime(year=2015, month=9, day=1, hour=1, minute=00)
-        expected = datetime(year=2015, month=12, day=1, hour=1, minute=00)
+        september = datetime(year=2015, month=9, day=1, hour=1, minute=00, tzinfo=UTC)
+        expected = datetime(year=2015, month=12, day=1, hour=1, minute=00, tzinfo=UTC)
         actual = next_n_months(september, 3)
         self.assertEqual(expected, actual)
-        november = datetime(year=2015, month=10, day=1, hour=1, minute=00)
-        expected = datetime(year=2016, month=1, day=1, hour=1, minute=00)
+        november = datetime(year=2015, month=10, day=1, hour=1, minute=00, tzinfo=UTC)
+        expected = datetime(year=2016, month=1, day=1, hour=1, minute=00, tzinfo=UTC)
         actual = next_n_months(november, 3)
         self.assertEqual(expected, actual)
 
diff --git a/pythonie/meetups/utils.py b/pythonie/meetups/utils.py
index 4b67386..651ff1b 100644
--- a/pythonie/meetups/utils.py
+++ b/pythonie/meetups/utils.py
@@ -9,10 +9,10 @@
 
 def get_content(url, params=None):
     response = requests.get(url, params=params, timeout=3)
-    log.info("Response from meetups request: {0}".format(response))
+    log.info(f"Response from meetups request: {response}")
     if not response:
         return []
-    log.debug("Retrieved {} from {}".format(response.json(), url))
+    log.debug(f"Retrieved {response.json()} from {url}")
     return response.json()
 
 
@@ -24,7 +24,7 @@ def update():
         params={"group_urlname": "pythonireland", "text_format": "html", "time": ",3m"},
     )
     if not meetup_data:
-        log.warn("No meetup data returned from API")
+        log.warning("No meetup data returned from API")
         return
     log.info(meetup_data)
     meetups = schema.Meetups()
@@ -40,7 +40,7 @@ def update():
         meetup.waitlist_count = result.get("waitlist_count")
 
         if result["updated"] <= meetup.updated:
-            log.info("Existing meetup:{!r} RSVPs updated".format(meetup))
+            log.info(f"Existing meetup:{meetup!r} RSVPs updated")
             meetup.save()
             continue
 
@@ -55,4 +55,4 @@ def update():
         meetup.status = result.get("status")
         meetup.visibility = result.get("visibility")
         meetup.save()
-        log.info("Existing meetup:{!r} fully updated".format(meetup))
+        log.info(f"Existing meetup:{meetup!r} fully updated")
diff --git a/pythonie/pythonie/settings/configure.py b/pythonie/pythonie/settings/configure.py
index a0c6cc1..8e38deb 100644
--- a/pythonie/pythonie/settings/configure.py
+++ b/pythonie/pythonie/settings/configure.py
@@ -16,7 +16,7 @@ def configure_redis(redis_url, test=False):
         import redis
 
         url = urlparse(redis_url)
-        log.info("Redis configured with redis_url: %s" % redis_url)
+        log.info("Redis configured with redis_url: %s", redis_url)
         return redis.Redis(host=url.hostname, port=url.port, password=url.password)
 
-    log.warn("Redis not configured")
+    log.warning("Redis not configured")
diff --git a/pythonie/sponsors/migrations/0001_initial.py b/pythonie/sponsors/migrations/0001_initial.py
index 04a9a7b..f92ef5e 100644
--- a/pythonie/sponsors/migrations/0001_initial.py
+++ b/pythonie/sponsors/migrations/0001_initial.py
@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from django.db import migrations, models
 
 
diff --git a/pythonie/sponsors/migrations/0002_restructure_sponsor.py b/pythonie/sponsors/migrations/0002_restructure_sponsor.py
index 0e0788e..2e4c613 100644
--- a/pythonie/sponsors/migrations/0002_restructure_sponsor.py
+++ b/pythonie/sponsors/migrations/0002_restructure_sponsor.py
@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from django.db import migrations, models
 
 
diff --git a/pythonie/sponsors/migrations/0003_sponsorshiplevel.py b/pythonie/sponsors/migrations/0003_sponsorshiplevel.py
index 05c8c49..a081c85 100644
--- a/pythonie/sponsors/migrations/0003_sponsorshiplevel.py
+++ b/pythonie/sponsors/migrations/0003_sponsorshiplevel.py
@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from django.db import migrations, models
 
 
diff --git a/pythonie/sponsors/migrations/0004_auto_20150726_1412.py b/pythonie/sponsors/migrations/0004_auto_20150726_1412.py
index 3ed8b10..0d17166 100644
--- a/pythonie/sponsors/migrations/0004_auto_20150726_1412.py
+++ b/pythonie/sponsors/migrations/0004_auto_20150726_1412.py
@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from django.db import migrations
 
 
diff --git a/uv.lock b/uv.lock
index 1406cf8..8021321 100644
--- a/uv.lock
+++ b/uv.lock
@@ -1187,44 +1187,44 @@ dev = [
 
 [package.metadata]
 requires-dist = [
-    { name = "boto3" },
-    { name = "colander" },
-    { name = "defusedxml" },
-    { name = "delorean" },
-    { name = "dj-database-url" },
-    { name = "dj-static" },
-    { name = "django", specifier = "<6.1" },
-    { name = "django-compressor" },
-    { name = "django-extensions" },
-    { name = "django-libsass" },
-    { name = "django-modelcluster" },
-    { name = "django-storages" },
-    { name = "django-taggit" },
-    { name = "gunicorn" },
-    { name = "pandas" },
-    { name = "psycopg", extras = ["binary"] },
-    { name = "pydantic" },
-    { name = "python-dateutil" },
-    { name = "pytz" },
-    { name = "redis" },
-    { name = "requests", specifier = ">=2.32.5" },
-    { name = "wagtail", specifier = ">=7.3.2,<7.4" },
-    { name = "whitenoise" },
-    { name = "willow" },
+    { name = "boto3", specifier = ">=1.43.102" },
+    { name = "colander", specifier = ">=2.0" },
+    { name = "defusedxml", specifier = ">=0.7.1" },
+    { name = "delorean", specifier = ">=2.0.0" },
+    { name = "dj-database-url", specifier = ">=3.1.2" },
+    { name = "dj-static", specifier = ">=0.0.6" },
+    { name = "django", specifier = ">=6.0.8,<6.1" },
+    { name = "django-compressor", specifier = ">=4.6.0" },
+    { name = "django-extensions", specifier = ">=4.1" },
+    { name = "django-libsass", specifier = ">=0.9" },
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