diff --git a/changes/1987.feature.rst b/changes/1987.feature.rst
new file mode 100644
index 000000000..0592d665c
--- /dev/null
+++ b/changes/1987.feature.rst
@@ -0,0 +1 @@
+The Flatpak runtimes for new projects were updated. ``org.freedesktop.Platform`` will now default to 24.08; ``org.gnome.Platform`` will now default to 46; and ``org.kde.Platform`` will now default to 6.7.
diff --git a/src/briefcase/bootstraps/console.py b/src/briefcase/bootstraps/console.py
index 58de0ad4a..4e7075a12 100644
--- a/src/briefcase/bootstraps/console.py
+++ b/src/briefcase/bootstraps/console.py
@@ -92,7 +92,7 @@ def pyproject_table_linux_system_arch(self):
     def pyproject_table_linux_flatpak(self):
         return """\
 flatpak_runtime = "org.freedesktop.Platform"
-flatpak_runtime_version = "23.08"
+flatpak_runtime_version = "24.08"
 flatpak_sdk = "org.freedesktop.Sdk"
 """
 
diff --git a/src/briefcase/bootstraps/pygame.py b/src/briefcase/bootstraps/pygame.py
index f4c0f304c..6176fc87b 100644
--- a/src/briefcase/bootstraps/pygame.py
+++ b/src/briefcase/bootstraps/pygame.py
@@ -128,7 +128,7 @@ def pyproject_table_linux_appimage(self):
     def pyproject_table_linux_flatpak(self):
         return """\
 flatpak_runtime = "org.freedesktop.Platform"
-flatpak_runtime_version = "23.08"
+flatpak_runtime_version = "24.08"
 flatpak_sdk = "org.freedesktop.Sdk"
 """
 
diff --git a/tests/commands/new/test_build_context.py b/tests/commands/new/test_build_context.py
index c37ff2618..1fb71d7eb 100644
--- a/tests/commands/new/test_build_context.py
+++ b/tests/commands/new/test_build_context.py
@@ -356,7 +356,7 @@ def main():
 """,
         pyproject_table_linux_flatpak="""\
 flatpak_runtime = "org.freedesktop.Platform"
-flatpak_runtime_version = "23.08"
+flatpak_runtime_version = "24.08"
 flatpak_sdk = "org.freedesktop.Sdk"
 """,
         pyproject_table_windows="""\
@@ -692,7 +692,7 @@ def main():
 """,
         pyproject_table_linux_flatpak="""\
 flatpak_runtime = "org.freedesktop.Platform"
-flatpak_runtime_version = "23.08"
+flatpak_runtime_version = "24.08"
 flatpak_sdk = "org.freedesktop.Sdk"
 """,
         pyproject_table_windows="""\