diff --git a/.forgejo/workflows/desktop.yml b/.forgejo/workflows/desktop.yml
index 5299191..6b5c68d 100644
--- a/.forgejo/workflows/desktop.yml
+++ b/.forgejo/workflows/desktop.yml
@@ -70,9 +70,11 @@ jobs:
       # Make the built .deb + .AppImage downloadable from the run (for hand-testing).
       # continue-on-error: the Forgejo artifact backend may not be configured yet; a
       # failed upload must not fail the build itself.
+      # Forgejo doesn't support the v4 artifact protocol (@actions/artifact v2+),
+      # so pin v3, which uses the older protocol the instance accepts.
       - name: Upload bundles
         continue-on-error: true
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v3
         with:
           name: thoughtsync-linux
           path: |