diff --git a/.circleci/config.yml b/.circleci/config.yml
index e097b61362..95803a6999 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -8,7 +8,7 @@ jobs:
       - checkout
       - run: python --version > .python_version
       - restore_cache:
-          key: &venv-cache venv-v1-{{ checksum "setup.py" }}-{{ checksum ".python_version" }}
+          key: &venv-cache venv-v1-{{ checksum "pyproject.toml" }}-{{ checksum ".python_version" }}
       # Only install if .venv wasn’t cached.
       - run: |
           if [[ ! -e ".venv" ]]; then
@@ -74,7 +74,7 @@ jobs:
           at: ~/project
       - run: python --version > .python_version
       - restore_cache:
-          key: &ui_tests-venv-cache ui_tests-venv-v1-{{ checksum "setup.py" }}-{{ checksum ".python_version" }}
+          key: &ui_tests-venv-cache ui_tests-venv-v1-{{ checksum "pyproject.toml" }}-{{ checksum ".python_version" }}
       # Only install if .venv wasn’t cached.
       - run: |
           if [[ ! -e ".venv" ]]; then
@@ -129,12 +129,11 @@ jobs:
       - image: cimg/python:3.12-node
     steps:
       - checkout
-      - run: pip install --user wheel boto3
+      - run: pip install --user build boto3
       - run: npm install
-      - run: npm run build
       - run: PYTHONPATH=. python scripts/nightly/get_version.py > __init__.py
       - run: mv __init__.py wagtail/__init__.py
-      - run: python setup.py bdist_wheel
+      - run: python -m build
       - run: python scripts/nightly/upload.py
 
 workflows: