diff --git a/.forgejo/workflows/desktop.yml b/.forgejo/workflows/desktop.yml
index f3984fa..77bd7c2 100644
--- a/.forgejo/workflows/desktop.yml
+++ b/.forgejo/workflows/desktop.yml
@@ -336,6 +336,9 @@ jobs:
           if [ "${GITHUB_REF_NAME}" = "dev" ]; then
             export RELEASE_TAG=dev
             export RELEASE_NOTES="Development build from ${GITHUB_SHA}"
+            # Rolling channel: drop the previous build's bundles once the manifest
+            # points at this one. Nothing can reach them, and they're ~100 MB a push.
+            export PRUNE_OLD_ASSETS=true
             APP_VERSION="$version" bash desktop/packaging/write-manifest.sh
           else
             export RELEASE_TAG="${GITHUB_REF_NAME}"
diff --git a/desktop/packaging/write-manifest.sh b/desktop/packaging/write-manifest.sh
index a93d91a..4e4030b 100644
--- a/desktop/packaging/write-manifest.sh
+++ b/desktop/packaging/write-manifest.sh
@@ -58,8 +58,18 @@ download_url() { printf '%s/%s/releases/download/%s/%s' "$GITHUB_SERVER_URL" "$G
 # install something it can't verify.
 platform_entry() {
   local target="$1" pattern="$2" bundle sig_name
-  bundle="$(printf '%s\n' "$names" | grep -E "$pattern" | head -1 || true)"
-  [ -n "$bundle" ] || { echo "    no bundle matching $pattern — skipping $target" >&2; return; }
+  # Matched on THIS build's version, not just the file extension.
+  #
+  # The rolling dev release accumulates every build's assets, and picking the first
+  # extension match returned the OLDEST one — so the manifest advertised the new
+  # version while pointing at an old binary. The client would install the older
+  # build, still be told the newer version was available, and update forever. The
+  # signature check couldn't catch it either: the old bundle's signature is
+  # perfectly valid FOR THE OLD BUNDLE.
+  bundle="$(printf '%s\n' "$names" | grep -F "_${APP_VERSION}_" | grep -E "$pattern" | head -1 || true)"
+  # A hard failure, not a skip: reaching here means this platform's build didn't
+  # upload, and the whole point is to never advertise a bundle that isn't there.
+  [ -n "$bundle" ] || { echo "    no $APP_VERSION bundle matching $pattern — skipping $target" >&2; return; }
   sig_name="$bundle.sig"
   if ! printf '%s\n' "$names" | grep -qxF "$sig_name"; then
     echo "    $bundle has no $sig_name — skipping $target (was the build signed?)" >&2
@@ -140,3 +150,31 @@ curl -fsS -X POST "${AUTH[@]}" "$API/releases/$target_id/assets?name=latest.json
   -F "attachment=@$work/latest.json" >/dev/null
 
 echo "==> Done. $MANIFEST_TAG now advertises $APP_VERSION for ${#entries[@]} platform(s)."
+
+# --- prune superseded builds from a rolling channel ---------------------------
+#
+# The dev release is republished on every push and its assets otherwise accumulate
+# forever — an AppImage alone is ~100 MB, so a week of pushes is gigabytes on the
+# Git host for builds nobody can reach (the manifest only ever names the newest).
+#
+# Only for a rolling channel. A versioned release must keep its assets: that IS the
+# archive, and the stable pointer's URLs aim at it.
+if [ "${PRUNE_OLD_ASSETS:-false}" = "true" ]; then
+  echo "==> Pruning superseded assets from $RELEASE_TAG"
+  # Re-read: the manifest upload above changed the asset list.
+  current="$(curl -sS "${AUTH[@]}" "$API/releases/$release_id/assets")"
+  printf '%s' "$current" \
+    | grep -oE '"id"[[:space:]]*:[[:space:]]*[0-9]+[^}]*"name"[[:space:]]*:[[:space:]]*"[^"]+"' \
+    | while IFS= read -r row; do
+        asset_id="$(printf '%s' "$row" | grep -oE '[0-9]+' | head -1)"
+        asset_name="$(printf '%s' "$row" | sed -E 's/.*"name"[[:space:]]*:[[:space:]]*"([^"]+)".*/\1/')"
+        # Keep the manifest itself and everything belonging to the current build.
+        case "$asset_name" in
+          latest.json) continue ;;
+          *"$APP_VERSION"*) continue ;;
+        esac
+        echo "    removing $asset_name"
+        curl -fsS -X DELETE "${AUTH[@]}" "$API/releases/$release_id/assets/$asset_id" >/dev/null || \
+          echo "    (couldn't remove $asset_name — leaving it)" >&2
+      done
+fi