diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 95f1fc8..87158a7 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -23,7 +23,7 @@ jobs:
     name: Pre-commit checks
     uses: beeware/.github/.github/workflows/pre-commit-run.yml@main
     with:
-      pre-commit-source: -r requirements.txt
+      pre-commit-source: --group dev
 
   unit-tests:
     name: Unit tests
@@ -38,8 +38,11 @@ jobs:
       with:
         python-version: "3.X"
 
+    - name: Update pip
+      run: python -m pip install -U pip
+
     - name: Install Dependencies
-      run: python -m pip install -r requirements.txt
+      run: python -m pip install --group dev
 
     - name: Test with tox
       run: tox
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..d8c3b0e
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,12 @@
+[dependency-groups]
+test = [
+    "pytest == 9.0.3",
+    "toml == 0.10.2",
+    "flake8 == 7.3.0",
+    "briefcase @ git+https://github.com/beeware/briefcase.git",
+]
+dev = [
+    "tox == 4.54.0",
+    "pre-commit == 4.6.0",
+    "black == 26.5.1",
+]
diff --git a/requirements.txt b/requirements.txt
index 5a75dab..1f93256 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,7 @@
+# Temporary: retained until beeware/.github's app-create-verify.yml
+# workflow is updated to read deps from pyproject.toml.
+# See beeware/briefcase-template#236.
+
 black == 26.5.1
 briefcase @ git+https://github.com/beeware/briefcase.git
 flake8 == 7.3.0
diff --git a/tox.ini b/tox.ini
index 1f66a79..022f703 100644
--- a/tox.ini
+++ b/tox.ini
@@ -2,5 +2,5 @@
 
 [testenv]
 skip_install = True
-deps = -r{toxinidir}/requirements.txt
+dependency_groups = test
 commands = python -m pytest {posargs:-vv --color yes tests/}