diff --git a/packaging/linux/flatpak/ai.storyteller.gridcraft.bundle.yml b/packaging/linux/flatpak/ai.storyteller.gridcraft.bundle.yml
index 913ac159e..a3fb2669e 100644
--- a/packaging/linux/flatpak/ai.storyteller.gridcraft.bundle.yml
+++ b/packaging/linux/flatpak/ai.storyteller.gridcraft.bundle.yml
@@ -17,6 +17,7 @@ runtime-version: '25.08'
 sdk: org.freedesktop.Sdk
 command: gridcraft
 finish-args:
+  - --filesystem=xdg-data/ArtCraft/versions:ro
   # Display: Wayland first; X11 only when no Wayland compositor is running.
   - --socket=wayland
   - --socket=fallback-x11