diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a852b47..354aaaa 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -133,7 +133,7 @@ jobs:
       run: briefcase package ${{ matrix.briefcase-target }} --update --adhoc-sign
 
     - name: Upload Logs
-      uses: actions/upload-artifact@v4.6.1
+      uses: actions/upload-artifact@v4.6.2
       if: failure()
       with:
         name: build-failure-logs-${{ matrix.backend }}-${{ matrix.python-version }}
diff --git a/pyproject.toml b/pyproject.toml
index 1b90c5b..8fda42a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -77,7 +77,8 @@ requires = [
 [tool.briefcase.app.testbed.linux]
 requires=[
     'pycairo',
-    'pygobject',
+    # Must be pinned to support Debian 12.
+    'pygobject==3.50.0',
 ]
 
 [tool.briefcase.app.testbed.linux.system.debian]
@@ -98,7 +99,7 @@ system_runtime_requires = [
 
 [tool.briefcase.app.testbed.linux.flatpak]
 flatpak_runtime = "org.gnome.Platform"
-flatpak_runtime_version = "45"
+flatpak_runtime_version = "47"
 flatpak_sdk = "org.gnome.Sdk"
 
 # template = "../../templates/briefcase-linux-flatpak-template"