diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 9b005c7..7c10fc3 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -45,53 +45,53 @@ jobs:
           - "windows-app"
           - "iOS"
           - "android"
-        python-version: ["3.10", "3.11", "3.12", "3.13", "3.14"]
+        python-version: ["3.11", "3.12", "3.13", "3.14", "3.15"]
 
         include:
-          - runs-on: ubuntu-latest
+          - runs-on: ubuntu-24.04
           - pre-command:
           - briefcase-target:
           - briefcase-run-args:
 
           - backend: macOS-Xcode
-            runs-on: macos-15
+            runs-on: macos-26
             briefcase-target: "macOS Xcode"
 
           - backend: macOS-app
-            runs-on: macos-15
+            runs-on: macos-26
             briefcase-target: "macOS app"
 
           - backend: linux-system
-            runs-on: ubuntu-latest
+            runs-on: ubuntu-24.04
             python-version: "system"
             pre-command: "sudo apt update -y && sudo apt install -y --no-install-recommends python3-dev python3-pip libcairo2-dev libgirepository1.0-dev gir1.2-gtk-3.0 libcanberra-gtk3-module"
             briefcase-target: "linux system"
 
           # - backend: linux-appimage
-          #   runs-on: ubuntu-latest
+          #   runs-on: ubuntu-24.04
           #   pre-command: "sudo apt update -y && sudo apt install -y --no-install-recommends libfuse2 libthai-dev libegl1"
           #   briefcase-target: "linux appimage"
 
           - backend: linux-flatpak
-            runs-on: ubuntu-latest
+            runs-on: ubuntu-24.04
             pre-command: "sudo apt update -y && sudo apt install -y --no-install-recommends flatpak flatpak-builder elfutils"
             briefcase-target: "linux flatpak"
 
           - backend: windows-VisualStudio
-            runs-on: windows-latest
+            runs-on: windows-2025
             briefcase-target: "windows VisualStudio"
 
           - backend: windows-app
-            runs-on: windows-latest
+            runs-on: windows-2025
             briefcase-target: "windows app"
 
           - backend: iOS
-            runs-on: macos-15
+            runs-on: macos-26
             briefcase-target: "iOS"
-            briefcase-run-args: ' -d "iPhone 16e::iOS 18.5"'
+            briefcase-run-args: ' -d "iPhone 17e::iOS 26.5"'
 
           - backend: android
-            runs-on: ubuntu-latest
+            runs-on: ubuntu-24.04
             briefcase-target: "android"
             briefcase-run-args: >
               --device '{"avd":"beePhone","device_type":"pixel"}'
@@ -106,6 +106,9 @@ jobs:
                 | sudo tee /etc/udev/rules.d/99-kvm4all.rules
               sudo udevadm control --reload-rules
               sudo udevadm trigger --name-match=kvm
+        exclude:
+          - backend: android
+            python-version: "3.15"
 
     steps:
       - name: Checkout
@@ -120,16 +123,6 @@ jobs:
           python-version: ${{ matrix.python-version }}
           allow-prereleases: true
 
-      - name: Prepare macOS
-        # GitHub recommends explicitly selecting the desired Xcode version:
-        # https://github.com/actions/runner-images/issues/12541#issuecomment-3083850140
-        # This became a necessity as a result of
-        # https://github.com/actions/runner-images/issues/12541 and
-        # https://github.com/actions/runner-images/issues/12751.
-        if: matrix.runs-on == 'macos-15'
-        run: |
-          sudo xcode-select --switch /Applications/Xcode_16.4.app
-
       - name: Install Dependencies
         run: ${{ matrix.pre-command }}
 
diff --git a/.gitignore b/.gitignore
index ee7b12b..a038bc7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,3 +6,4 @@ build/
 logs/
 .DS_Store
 .vscode
+.briefcase
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 4388d03..2dbcd8a 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -15,7 +15,7 @@ repos:
       - id: docformatter
         args: [--in-place, --black]
   - repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: v0.16.1
+    rev: v0.16.6
     hooks:
       - id: ruff-format
       - id: ruff-check
diff --git a/pth-tester/pyproject.toml b/pth-tester/pyproject.toml
index b73d9fe..8af578c 100644
--- a/pth-tester/pyproject.toml
+++ b/pth-tester/pyproject.toml
@@ -1,5 +1,5 @@
 [build-system]
-requires = ["setuptools==83.0.0", "wheel"]
+requires = ["setuptools==84.0.0", "wheel"]
 build-backend = "setuptools.build_meta"
 
 [project]