diff --git a/README.md b/README.md
index 5f76274..2847138 100644
--- a/README.md
+++ b/README.md
@@ -72,10 +72,20 @@ ip link add link eth0 name eth0.200 type vlan id 200
 
 ## Как работает
 
-Плагин использует ExtJS `override` на `PVE.qemu.NetworkInputPanel` и добавляет поле Trunks в секцию Advanced. Оригинальные файлы Proxmox не модифицируются — загружается только новый JS-файл через index template.
+Плагин использует ExtJS `override` на `PVE.qemu.NetworkInputPanel` и добавляет поле Trunks в секцию Advanced. Сериализацию делает штатный `PVE.Parser.printQemuNetwork` (он уже умеет `trunks=`), плагин лишь поддерживает `me.network.trunks`. Исходные файлы pvemanagerlib не правятся — добавляется только новый JS-файл, подключённый в index template после `pvemanagerlib.js`.
+
+### Переживание обновлений
+
+JS-файл (`/usr/share/pve-manager/js/`) и `index.html.tpl` принадлежат пакету `pve-manager`, поэтому `apt upgrade` их затирает. Установщик поэтому:
+
+- кладёт копию плагина в `/usr/local/share/pve-trunks-plugin/`;
+- ставит идемпотентный `/usr/local/sbin/pve-trunks-reapply.sh` (восстанавливает JS и тег в шаблоне, перезапускает `pveproxy` только при реальном изменении);
+- регистрирует apt-hook `/etc/apt/apt.conf.d/99-pve-trunks-plugin`, дёргающий reapply в конце apt-транзакции.
+
+`install.sh` и `uninstall.sh` идемпотентны; перед правкой `index.html.tpl` делается бэкап `index.html.tpl.pve-trunks-bak`.
 
 ## Файлы
 
 - `pve-trunks-plugin.js` — ExtJS override плагин
-- `install.sh` — установщик
-- `uninstall.sh` — удаление
+- `install.sh` — установщик (+ reapply-hook для апгрейдов)
+- `uninstall.sh` — удаление (вместе с reapply-машинерией)
diff --git a/install.sh b/install.sh
index ced34ee..1504334 100755
--- a/install.sh
+++ b/install.sh
@@ -1,42 +1,93 @@
 #!/bin/bash
 # PVE Trunks Plugin - Installer
-# Adds "Trunks" field to VM Network Device editor in Proxmox VE UI
+# Adds a "Trunks" field to the VM Network Device editor in the Proxmox VE UI.
 #
 # Usage: bash install.sh
+#
+# Both the plugin JS and the index template belong to the `pve-manager`
+# package, so an `apt upgrade` wipes them. This installer therefore also sets
+# up a reapply hook so the plugin survives Proxmox updates.
 
-set -e
+set -euo pipefail
 
 PLUGIN_JS="pve-trunks-plugin.js"
 PVE_JS_DIR="/usr/share/pve-manager/js"
 INDEX_TPL="/usr/share/pve-manager/index.html.tpl"
 SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
-SCRIPT_TAG='<script type="text/javascript" src="/pve2/js/pve-trunks-plugin.js"></script>'
 
-# Check running as root
+# Persistent copy + reapply machinery (so upgrades can restore the plugin).
+STORE_DIR="/usr/local/share/pve-trunks-plugin"
+REAPPLY="/usr/local/sbin/pve-trunks-reapply.sh"
+APT_HOOK="/etc/apt/apt.conf.d/99-pve-trunks-plugin"
+SCRIPT_TAG='<script type="text/javascript" src="/pve2/js/pve-trunks-plugin.js?ver=2"></script>'
+
 if [ "$(id -u)" -ne 0 ]; then
-    echo "Error: run as root"
+    echo "Error: run as root" >&2
     exit 1
 fi
 
-# Check Proxmox
-if [ ! -d "$PVE_JS_DIR" ]; then
-    echo "Error: Proxmox VE not found ($PVE_JS_DIR missing)"
+if [ ! -d "$PVE_JS_DIR" ] || [ ! -f "$INDEX_TPL" ]; then
+    echo "Error: Proxmox VE not found ($PVE_JS_DIR / $INDEX_TPL missing)" >&2
     exit 1
 fi
 
-# Copy plugin JS
-cp "$SCRIPT_DIR/$PLUGIN_JS" "$PVE_JS_DIR/$PLUGIN_JS"
-echo "Installed $PVE_JS_DIR/$PLUGIN_JS"
-
-# Patch index template if not already patched
-if ! grep -q "pve-trunks-plugin" "$INDEX_TPL"; then
-    # Insert before closing </body>
-    sed -i "s|</body>|${SCRIPT_TAG}\n</body>|" "$INDEX_TPL"
-    echo "Patched $INDEX_TPL"
-else
-    echo "Index template already patched, skipping"
+if [ ! -f "$SCRIPT_DIR/$PLUGIN_JS" ]; then
+    echo "Error: $PLUGIN_JS not found next to installer" >&2
+    exit 1
 fi
 
-# Restart web UI
-systemctl restart pveproxy
+# 1) Persist the plugin source for the reapply hook.
+install -d "$STORE_DIR"
+install -m 0644 "$SCRIPT_DIR/$PLUGIN_JS" "$STORE_DIR/$PLUGIN_JS"
+
+# 2) Install the reapply script (idempotent; restarts pveproxy only on change).
+cat > "$REAPPLY" <<EOF
+#!/bin/bash
+# Reapply PVE Trunks Plugin (after pve-manager upgrade or manual run). Idempotent.
+set -u
+PVE_JS_DIR="$PVE_JS_DIR"
+INDEX_TPL="$INDEX_TPL"
+STORE_DIR="$STORE_DIR"
+PLUGIN_JS="$PLUGIN_JS"
+SCRIPT_TAG='$SCRIPT_TAG'
+[ -d "\$PVE_JS_DIR" ] && [ -f "\$INDEX_TPL" ] || exit 0
+[ -f "\$STORE_DIR/\$PLUGIN_JS" ] || exit 0
+
+changed=0
+
+# Restore the JS file if missing or outdated.
+if ! cmp -s "\$STORE_DIR/\$PLUGIN_JS" "\$PVE_JS_DIR/\$PLUGIN_JS" 2>/dev/null; then
+    install -m 0644 "\$STORE_DIR/\$PLUGIN_JS" "\$PVE_JS_DIR/\$PLUGIN_JS"
+    changed=1
+fi
+
+# Re-add the <script> tag if missing (must sit before </body>).
+if ! grep -q "pve-trunks-plugin" "\$INDEX_TPL"; then
+    if grep -q "</body>" "\$INDEX_TPL"; then
+        cp -a "\$INDEX_TPL" "\$INDEX_TPL.pve-trunks-bak"
+        awk -v tag="\$SCRIPT_TAG" '/<\/body>/ && !done { print tag; done=1 } { print }' \
+            "\$INDEX_TPL" > "\$INDEX_TPL.tmp" && mv "\$INDEX_TPL.tmp" "\$INDEX_TPL"
+        changed=1
+    else
+        logger -t pve-trunks-plugin "no </body> in \$INDEX_TPL; cannot patch"
+    fi
+fi
+
+if [ "\$changed" -eq 1 ]; then
+    systemctl try-restart pveproxy
+    logger -t pve-trunks-plugin "plugin reapplied"
+fi
+EOF
+chmod 0755 "$REAPPLY"
+
+# 3) apt hook: reapply at the end of any apt/dpkg transaction (e.g. pve-manager upgrade).
+cat > "$APT_HOOK" <<EOF
+// pve-trunks-plugin: restore UI plugin after pve-manager upgrades
+DPkg::Post-Invoke { "test -x $REAPPLY && $REAPPLY >/dev/null 2>&1 || true"; };
+EOF
+
+# 4) Apply now.
+"$REAPPLY"
+
+echo "Installed. Reapply hook: $APT_HOOK -> $REAPPLY"
 echo "Done. Reload the Proxmox web UI (Ctrl+Shift+R)."
diff --git a/pve-trunks-plugin.js b/pve-trunks-plugin.js
index 2ae97bf..22f82d3 100644
--- a/pve-trunks-plugin.js
+++ b/pve-trunks-plugin.js
@@ -1,15 +1,24 @@
 /*
  * Proxmox VE - VLAN Trunks UI Plugin
- * Adds "Trunks" field to QEMU VM Network Device editor
+ * Adds a "Trunks" field to the QEMU VM Network Device editor.
  *
- * Install: place in /usr/share/pve-manager/js/ and patch index template
- * See install.sh for automated installation
+ * The PVE network parser/printer (PVE.Parser) already understands the
+ * `trunks=` option; only the UI field is missing. This override adds it.
+ *
+ * Install: place in /usr/share/pve-manager/js/ and load it after
+ * pvemanagerlib.js via the index template (see install.sh).
  */
 
 Ext.define('PVE.patch.QemuNetworkTrunks', {
     override: 'PVE.qemu.NetworkInputPanel',
 
-    onGetValues: function(values) {
+    // Keep in sync with the parser regex in pvemanagerlib.js (print/parse_net).
+    trunksRegex: /^\d+(?:-\d+)?(?:;\d+(?:-\d+)?)*$/,
+
+    // The original onGetValues builds `me.network` and serializes it with
+    // PVE.Parser.printQemuNetwork(), which appends `,trunks=` when set.
+    // So we just maintain me.network.trunks and let the parent serialize.
+    onGetValues: function (values) {
         var me = this;
 
         if (values.trunks) {
@@ -17,38 +26,47 @@ Ext.define('PVE.patch.QemuNetworkTrunks', {
         } else {
             delete me.network.trunks;
         }
-        delete values.trunks;
+        delete values.trunks; // not a real form field for the parent
 
         return me.callParent([values]);
     },
 
-    initComponent: function() {
+    initComponent: function () {
         var me = this;
 
         me.callParent(arguments);
 
-        // Add trunks field after MTU in advanced column
-        var mtuFields = me.query('[name=mtu]');
-        if (mtuFields.length > 0) {
-            var container = mtuFields[0].ownerCt;
-            if (container) {
-                container.add({
-                    xtype: 'textfield',
-                    name: 'trunks',
-                    fieldLabel: 'Trunks',
-                    emptyText: 'e.g. 100;200;300-400',
-                    allowBlank: true,
-                    regex: /^\d+(?:-\d+)?(?:;\d+(?:-\d+)?)*$/,
-                    regexText: 'VLAN IDs separated by semicolons, e.g. 100;200;300-400',
-                });
-            }
+        me.addTrunksField();
+    },
+
+    // Insert the Trunks field right after MTU in the advanced column.
+    addTrunksField: function () {
+        var me = this;
+
+        if (me.down('[name=trunks]')) {
+            return; // already added
         }
 
-        // Handle "No network device" checkbox in wizard
+        var mtuField = me.down('[name=mtu]');
+        var container = mtuField && mtuField.ownerCt;
+        if (!container) {
+            return; // layout changed in this PVE version; fail safe
+        }
+
+        container.add({
+            xtype: 'textfield',
+            name: 'trunks',
+            fieldLabel: 'Trunks',
+            emptyText: 'e.g. 100;200;300-400',
+            allowBlank: true,
+            regex: me.trunksRegex,
+            regexText: 'VLAN IDs separated by semicolons, e.g. 100;200;300-400',
+        });
+
+        // In the wizard, disable Trunks together with "No network device".
         var noNetworkCb = me.down('[name=nonetwork]');
         if (noNetworkCb) {
-            var origHandler = noNetworkCb.listeners && noNetworkCb.listeners.change;
-            noNetworkCb.on('change', function(cb, value) {
+            noNetworkCb.on('change', function (cb, value) {
                 var trunksField = me.down('[name=trunks]');
                 if (trunksField) {
                     trunksField.setDisabled(value);
diff --git a/uninstall.sh b/uninstall.sh
index 587ebc0..8ae87d2 100755
--- a/uninstall.sh
+++ b/uninstall.sh
@@ -1,24 +1,32 @@
 #!/bin/bash
 # PVE Trunks Plugin - Uninstaller
 
-set -e
+set -euo pipefail
 
 PVE_JS_DIR="/usr/share/pve-manager/js"
 INDEX_TPL="/usr/share/pve-manager/index.html.tpl"
 PLUGIN_JS="pve-trunks-plugin.js"
+STORE_DIR="/usr/local/share/pve-trunks-plugin"
+REAPPLY="/usr/local/sbin/pve-trunks-reapply.sh"
+APT_HOOK="/etc/apt/apt.conf.d/99-pve-trunks-plugin"
 
 if [ "$(id -u)" -ne 0 ]; then
-    echo "Error: run as root"
+    echo "Error: run as root" >&2
     exit 1
 fi
 
-# Remove plugin JS
+# Remove reapply machinery first, so it can't restore the plugin afterwards.
+rm -f "$APT_HOOK" "$REAPPLY"
+rm -rf "$STORE_DIR"
+
+# Remove the plugin JS.
 rm -f "$PVE_JS_DIR/$PLUGIN_JS"
-echo "Removed $PVE_JS_DIR/$PLUGIN_JS"
 
-# Remove script tag from index template
-sed -i '/pve-trunks-plugin/d' "$INDEX_TPL"
-echo "Cleaned $INDEX_TPL"
+# Remove the <script> tag line(s) from the index template.
+if grep -q "pve-trunks-plugin" "$INDEX_TPL"; then
+    cp -a "$INDEX_TPL" "$INDEX_TPL.pve-trunks-bak"
+    sed -i '/pve-trunks-plugin/d' "$INDEX_TPL"
+fi
 
-systemctl restart pveproxy
-echo "Done. Reload the Proxmox web UI (Ctrl+Shift+R)."
+systemctl try-restart pveproxy
+echo "Removed. Reload the Proxmox web UI (Ctrl+Shift+R)."