diff --git a/class-31/demo/things-api/.dockerignore b/class-31/demo/things-api/.dockerignore
new file mode 100644
index 0000000..f32ebbe
--- /dev/null
+++ b/class-31/demo/things-api/.dockerignore
@@ -0,0 +1,4 @@
+# .dockerignore
+.venv
+.git
+.gitignore
diff --git a/class-31/demo/things-api/Dockerfile b/class-31/demo/things-api/Dockerfile
new file mode 100644
index 0000000..88e391b
--- /dev/null
+++ b/class-31/demo/things-api/Dockerfile
@@ -0,0 +1,17 @@
+# Pull base image
+FROM python:3.11.5-slim-bullseye
+
+# Set environment variables
+ENV PIP_DISABLE_PIP_VERSION_CHECK 1
+ENV PYTHONDONTWRITEBYTECODE 1
+ENV PYTHONUNBUFFERED 1
+
+# Set work directory
+WORKDIR /code
+
+# Install dependencies
+COPY ./requirements.txt .
+RUN pip install -r requirements.txt
+
+# Copy project
+COPY . .
diff --git a/class-31/demo/things-api/db.sqlite3 b/class-31/demo/things-api/db.sqlite3
index 2b4ae20..7d45e32 100644
Binary files a/class-31/demo/things-api/db.sqlite3 and b/class-31/demo/things-api/db.sqlite3 differ
diff --git a/class-31/demo/things-api/docker-compose.yml b/class-31/demo/things-api/docker-compose.yml
new file mode 100644
index 0000000..2f4aaaf
--- /dev/null
+++ b/class-31/demo/things-api/docker-compose.yml
@@ -0,0 +1,8 @@
+services:
+  web:
+    build: .
+    ports:
+      - "8000:8000"
+    command: python manage.py runserver 0.0.0.0:8000
+    volumes:
+      - .:/code
diff --git a/class-31/demo/things-api/requirements.txt b/class-31/demo/things-api/requirements.txt
index 2dc0730..8cf7a1c 100644
--- a/class-31/demo/things-api/requirements.txt
+++ b/class-31/demo/things-api/requirements.txt
@@ -1,13 +1,5 @@
-asgiref==3.5.0
-click==8.0.4
-Django==4.0.3
-djangorestframework==3.13.1
-mccabe==0.6.1
-mypy-extensions==0.4.3
-pathspec==0.9.0
-platformdirs==2.5.1
-pycodestyle==2.8.0
-pyflakes==2.4.0
-pytz==2021.3
-sqlparse==0.4.2
-tomli==2.0.1
+asgiref==3.7.2
+Django==5.0.2
+djangorestframework==3.14.0
+pytz==2024.1
+sqlparse==0.4.4
diff --git a/class-31/demo/things-api/things/migrations/0001_initial.py b/class-31/demo/things-api/things/migrations/0001_initial.py
index 726777d..7221ab2 100644
--- a/class-31/demo/things-api/things/migrations/0001_initial.py
+++ b/class-31/demo/things-api/things/migrations/0001_initial.py
@@ -1,8 +1,8 @@
-# Generated by Django 4.0.3 on 2022-03-03 23:09
+# Generated by Django 5.0.2 on 2024-02-17 16:54
 
+import django.db.models.deletion
 from django.conf import settings
 from django.db import migrations, models
-import django.db.models.deletion
 
 
 class Migration(migrations.Migration):
diff --git a/class-31/demo/things-api/things_api_project/asgi.py b/class-31/demo/things-api/things_api_project/asgi.py
index c1e36eb..e9fce96 100644
--- a/class-31/demo/things-api/things_api_project/asgi.py
+++ b/class-31/demo/things-api/things_api_project/asgi.py
@@ -4,7 +4,7 @@
 It exposes the ASGI callable as a module-level variable named ``application``.
 
 For more information on this file, see
-https://docs.djangoproject.com/en/4.0/howto/deployment/asgi/
+https://docs.djangoproject.com/en/5.0/howto/deployment/asgi/
 """
 
 import os
diff --git a/class-31/demo/things-api/things_api_project/settings.py b/class-31/demo/things-api/things_api_project/settings.py
index 45f44ba..52b3f76 100644
--- a/class-31/demo/things-api/things_api_project/settings.py
+++ b/class-31/demo/things-api/things_api_project/settings.py
@@ -1,13 +1,13 @@
 """
 Django settings for things_api_project project.
 
-Generated by 'django-admin startproject' using Django 4.0.3.
+Generated by 'django-admin startproject' using Django 5.0.2.
 
 For more information on this file, see
-https://docs.djangoproject.com/en/4.0/topics/settings/
+https://docs.djangoproject.com/en/5.0/topics/settings/
 
 For the full list of settings and their values, see
-https://docs.djangoproject.com/en/4.0/ref/settings/
+https://docs.djangoproject.com/en/5.0/ref/settings/
 """
 
 from pathlib import Path
@@ -17,10 +17,10 @@
 
 
 # Quick-start development settings - unsuitable for production
-# See https://docs.djangoproject.com/en/4.0/howto/deployment/checklist/
+# See https://docs.djangoproject.com/en/5.0/howto/deployment/checklist/
 
 # SECURITY WARNING: keep the secret key used in production secret!
-SECRET_KEY = "django-insecure-ke)sw__nz&hzvq42cl)w8t8zt%_g1-g_8!ur3#%4)@$t)s-(5t"
+SECRET_KEY = 'django-insecure-y0hx8ys-r4d0qr9jw_a&^=*f%h2kkvs-avlav1%0lx1t1tqdn&'
 
 # SECURITY WARNING: don't run with debug turned on in production!
 DEBUG = True
@@ -31,85 +31,87 @@
 # Application definition
 
 INSTALLED_APPS = [
-    "django.contrib.admin",
-    "django.contrib.auth",
-    "django.contrib.contenttypes",
-    "django.contrib.sessions",
-    "django.contrib.messages",
-    "django.contrib.staticfiles",
-    # third party
-    "rest_framework",
-    # local
-    "things",
+    'django.contrib.admin',
+    'django.contrib.auth',
+    'django.contrib.contenttypes',
+    'django.contrib.sessions',
+    'django.contrib.messages',
+    'django.contrib.staticfiles',
+
+    # 3rd party
+    'rest_framework',
+
+    # in house
+    'things'
 ]
 
 MIDDLEWARE = [
-    "django.middleware.security.SecurityMiddleware",
-    "django.contrib.sessions.middleware.SessionMiddleware",
-    "django.middleware.common.CommonMiddleware",
-    "django.middleware.csrf.CsrfViewMiddleware",
-    "django.contrib.auth.middleware.AuthenticationMiddleware",
-    "django.contrib.messages.middleware.MessageMiddleware",
-    "django.middleware.clickjacking.XFrameOptionsMiddleware",
+    'django.middleware.security.SecurityMiddleware',
+    'django.contrib.sessions.middleware.SessionMiddleware',
+    'django.middleware.common.CommonMiddleware',
+    'django.middleware.csrf.CsrfViewMiddleware',
+    'django.contrib.auth.middleware.AuthenticationMiddleware',
+    'django.contrib.messages.middleware.MessageMiddleware',
+    'django.middleware.clickjacking.XFrameOptionsMiddleware',
 ]
 
-ROOT_URLCONF = "things_api_project.urls"
+ROOT_URLCONF = 'things_api_project.urls'
 
 TEMPLATES = [
     {
-        "BACKEND": "django.template.backends.django.DjangoTemplates",
-        "DIRS": [],
-        "APP_DIRS": True,
-        "OPTIONS": {
-            "context_processors": [
-                "django.template.context_processors.debug",
-                "django.template.context_processors.request",
-                "django.contrib.auth.context_processors.auth",
-                "django.contrib.messages.context_processors.messages",
+        'BACKEND': 'django.template.backends.django.DjangoTemplates',
+        'DIRS': [],
+        'APP_DIRS': True,
+        'OPTIONS': {
+            'context_processors': [
+                'django.template.context_processors.debug',
+                'django.template.context_processors.request',
+                'django.contrib.auth.context_processors.auth',
+                'django.contrib.messages.context_processors.messages',
             ],
         },
     },
 ]
 
-WSGI_APPLICATION = "things_api_project.wsgi.application"
+WSGI_APPLICATION = 'things_api_project.wsgi.application'
 
 
 # Database
-# https://docs.djangoproject.com/en/4.0/ref/settings/#databases
+# https://docs.djangoproject.com/en/5.0/ref/settings/#databases
 
 DATABASES = {
-    "default": {
-        "ENGINE": "django.db.backends.sqlite3",
-        "NAME": BASE_DIR / "db.sqlite3",
+    'default': {
+        'ENGINE': 'django.db.backends.sqlite3',
+        'NAME': BASE_DIR / 'db.sqlite3',
     }
 }
 
 
 # Password validation
-# https://docs.djangoproject.com/en/4.0/ref/settings/#auth-password-validators
+# https://docs.djangoproject.com/en/5.0/ref/settings/#auth-password-validators
 
 AUTH_PASSWORD_VALIDATORS = [
     {
-        "NAME": "django.contrib.auth.password_validation.UserAttributeSimilarityValidator",
+        'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
     },
     {
-        "NAME": "django.contrib.auth.password_validation.MinimumLengthValidator",
+        'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
     },
     {
-        "NAME": "django.contrib.auth.password_validation.CommonPasswordValidator",
+        'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
     },
     {
-        "NAME": "django.contrib.auth.password_validation.NumericPasswordValidator",
+        'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
     },
 ]
 
 
 # Internationalization
-# https://docs.djangoproject.com/en/4.0/topics/i18n/
+# https://docs.djangoproject.com/en/5.0/topics/i18n/
 
-LANGUAGE_CODE = "en-us"
+LANGUAGE_CODE = 'en-us'
 
-TIME_ZONE = "UTC"
+TIME_ZONE = 'UTC'
 
 USE_I18N = True
 
@@ -117,17 +119,11 @@
 
 
 # Static files (CSS, JavaScript, Images)
-# https://docs.djangoproject.com/en/4.0/howto/static-files/
+# https://docs.djangoproject.com/en/5.0/howto/static-files/
 
-STATIC_URL = "static/"
+STATIC_URL = 'static/'
 
 # Default primary key field type
-# https://docs.djangoproject.com/en/4.0/ref/settings/#default-auto-field
+# https://docs.djangoproject.com/en/5.0/ref/settings/#default-auto-field
 
-DEFAULT_AUTO_FIELD = "django.db.models.BigAutoField"
-
-REST_FRAMEWORK = {
-    "DEFAULT_PERMISSION_CLASSES": [
-        "rest_framework.permissions.AllowAny",
-    ]
-}
+DEFAULT_AUTO_FIELD = 'django.db.models.BigAutoField'
diff --git a/class-31/demo/things-api/things_api_project/urls.py b/class-31/demo/things-api/things_api_project/urls.py
index 89b7d48..819fa91 100644
--- a/class-31/demo/things-api/things_api_project/urls.py
+++ b/class-31/demo/things-api/things_api_project/urls.py
@@ -1,7 +1,8 @@
-"""things_api_project URL Configuration
+"""
+URL configuration for things_api_project project.
 
 The `urlpatterns` list routes URLs to views. For more information please see:
-    https://docs.djangoproject.com/en/4.0/topics/http/urls/
+    https://docs.djangoproject.com/en/5.0/topics/http/urls/
 Examples:
 Function views
     1. Add an import:  from my_app import views
@@ -17,6 +18,6 @@
 from django.urls import include, path
 
 urlpatterns = [
-    path("admin/", admin.site.urls),
+    path('admin/', admin.site.urls),
     path("api/v1/things/", include("things.urls")),
 ]
diff --git a/class-31/demo/things-api/things_api_project/wsgi.py b/class-31/demo/things-api/things_api_project/wsgi.py
index 1e9570a..eab5e1e 100644
--- a/class-31/demo/things-api/things_api_project/wsgi.py
+++ b/class-31/demo/things-api/things_api_project/wsgi.py
@@ -4,7 +4,7 @@
 It exposes the WSGI callable as a module-level variable named ``application``.
 
 For more information on this file, see
-https://docs.djangoproject.com/en/4.0/howto/deployment/wsgi/
+https://docs.djangoproject.com/en/5.0/howto/deployment/wsgi/
 """
 
 import os