diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 004f0e7..6b1ddbf 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -31,7 +31,7 @@ jobs:
     uses: beeware/.github/.github/workflows/app-build-verify.yml@main
     with:
       python-version: ${{ matrix.python-version }}
-      runner-os: macos-latest
+      runner-os: macos-26
       framework: ${{ matrix.framework }}
       target-platform: macOS
       target-format: Xcode
diff --git a/.github/workflows/update-binary.yml b/.github/workflows/update-binary.yml
index 15359c0..d96dca5 100644
--- a/.github/workflows/update-binary.yml
+++ b/.github/workflows/update-binary.yml
@@ -7,7 +7,7 @@ on:
 jobs:
   build-stubs:
     name: Build stub binaries
-    runs-on: macos-latest
+    runs-on: macos-26
     strategy:
       matrix:
         python-version: [ "3.10", "3.11", "3.12", "3.13", "3.14" ]
diff --git a/{{ cookiecutter.format }}/briefcase.toml b/{{ cookiecutter.format }}/briefcase.toml
index ef404a7..8d9d303 100644
--- a/{{ cookiecutter.format }}/briefcase.toml	
+++ b/{{ cookiecutter.format }}/briefcase.toml	
@@ -14,8 +14,8 @@ support_path = "Support"
     "3.10": "support_revision = 12",
     "3.11": "support_revision = 7",
     "3.12": "support_revision = 7",
-    "3.13": "support_revision = 10",
-    "3.14": "support_revision = 6",
+    "3.13": "support_revision = 12",
+    "3.14": "support_revision = 8",
 }.get(cookiecutter.python_version|py_tag, "") }}
 cleanup_paths = [
     "Support/Python.xcframework/**/python*/config-*-darwin",