diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 58aedf5..ab29592 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [ '3.9', '3.10', '3.11']
+        python-version: [ '3.10', '3.11', '3.12', '3.13']
     name: Python ${{ matrix.python-version }} sample
     steps:
       - uses: actions/checkout@v4
@@ -26,37 +26,29 @@ jobs:
           path: ${{ env.pythonLocation }}
           key: ${{ env.pythonLocation }}-${{ hashFiles('setup.py') }}-${{ hashFiles('dev-requirements.txt') }}
 
-      - name: Install setup tools
-        run: pip install setuptools
-
-      - name: Install
-        run: python setup.py install
+      - name: Install tox
+        run: python -m pip install -U tox
 
       - name: Test
-        run: python setup.py test
-
-      - name: install coveralls
-        run: pip install coveralls
-
-
-      - name: Generate coverage
-        run: coverage run --include=iiif-presentation-validator.py setup.py test
+        run: tox
 
-      - name: Upload coverage data to coveralls.io
-        run: coveralls --service=github
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-          COVERALLS_FLAG_NAME: ${{ matrix.python-version }}
-          COVERALLS_PARALLEL: true
-
-  Coveralls:
+      - name: Upload coverage to Coveralls
+        uses: coverallsapp/github-action@v2
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          format: cobertura
+          file: coverage.xml
+          flag-name: ${{ matrix.python-version }}
+          parallel: true
+          
+  coveralls-finish:
     needs: build
     runs-on: ubuntu-latest
-    container: python:3-slim
+    if: ${{ always() }}
     steps:
-    - name: Coveralls Finished
-      run: |
-        pip3 install --upgrade coveralls
-        coveralls --service=github --finish
-      env:
-        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      - name: Finish Coveralls parallel build
+        uses: coverallsapp/github-action@v2
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          parallel-finished: true
+
diff --git a/schema/iiif_3_0.json b/schema/iiif_3_0.json
index 0b8cded..b58dc8c 100644
--- a/schema/iiif_3_0.json
+++ b/schema/iiif_3_0.json
@@ -156,10 +156,14 @@
             "properties":{
                 "type": {
                     "type": "string",
-                    "const": "Choice"
+                    "const": "Choice",
+                    "default": "Choice"
                 },
                 "items":{
-                    "type": "array"
+                    "type": "array",
+                    "items": {
+                        "$ref": "#/classes/resource"
+                    }
                 }
             },
             "required": ["type", "items"]
@@ -987,23 +991,12 @@
                                 },
                                 {
                                     "type": "object",
-                                    "allOf":[
-                                        { "$ref": "#/classes/choice" },
-                                        {
-                                            "properties": {
-                                                "items": {
-                                                    "type": "array",
-                                                    "items": {"$ref": "#/classes/resource"}
-                                                }
-                                            },
-                                            "required": ["items"]
-                                        }
-                                    ]
+                                    "$ref": "#/classes/choice" 
                                 },
                                 {
                                     "type": "array",
                                     "items": {
-                                        "type": "object"
+                                        "$ref": "#/classes/resource"
                                     }
                                 }
 
diff --git a/setup.py b/setup.py
index ab2b0b7..b1578c0 100644
--- a/setup.py
+++ b/setup.py
@@ -33,9 +33,10 @@ def run(self):
                  "Intended Audience :: Developers",
                  "Operating System :: OS Independent",
                  "Programming Language :: Python",
-                 "Programming Language :: Python :: 3.9",
                  "Programming Language :: Python :: 3.10",
                  "Programming Language :: Python :: 3.11",
+                 "Programming Language :: Python :: 3.12",
+                 "Programming Language :: Python :: 3.13",
                  "Topic :: Internet :: WWW/HTTP",
                  "Topic :: Multimedia :: Graphics :: Graphics Conversion",
                  "Topic :: Software Development :: "
@@ -54,11 +55,6 @@ def run(self):
     extras_require={
         ':python_version>="3.6"': ["Pillow>=3.2.0"]
     },
-    test_suite="tests",
-    tests_require=[
-        "coverage",
-        "mock",
-    ],
     cmdclass={
         'coverage': Coverage,
     },
diff --git a/tests/test_validator.py b/tests/test_validator.py
index 6cb5c90..1369ea1 100644
--- a/tests/test_validator.py
+++ b/tests/test_validator.py
@@ -1,6 +1,6 @@
 """Test code for iiif-presentation-validator.py."""
 import unittest
-from mock import Mock
+from unittest.mock import Mock
 try:
     import imp
 except ImportError:
diff --git a/tox.ini b/tox.ini
new file mode 100644
index 0000000..42e7b59
--- /dev/null
+++ b/tox.ini
@@ -0,0 +1,10 @@
+[tox]
+envlist = py
+
+[testenv]
+deps =
+    coverage
+commands =
+    coverage run -m unittest discover -s tests -p "test*.py"
+    coverage xml
+    coverage report -m