diff --git a/src/api/openapi.js b/src/api/openapi.js
index 624bb5e..3e55e93 100644
--- a/src/api/openapi.js
+++ b/src/api/openapi.js
@@ -1704,7 +1704,8 @@
  *         clientversion:
  *           type: string
  *           nullable: true
- *           description: Client software version reported by POS terminal
+ *           readOnly: true
+ *           description: Client software version reported by POS terminal during pairing (read-only)
  *         lastseenAt:
  *           type: string
  *           nullable: true
diff --git a/src/api/routes/posterminal.js b/src/api/routes/posterminal.js
index dbdcfa6..7c0e156 100644
--- a/src/api/routes/posterminal.js
+++ b/src/api/routes/posterminal.js
@@ -256,9 +256,6 @@ export function register(app, basePath = '') {
      *                 type: integer
      *               enabled:
      *                 type: boolean
-     *               clientversion:
-     *                 type: string
-     *                 nullable: true
      *               pairingpin:
      *                 type: string
      *                 nullable: true
@@ -344,10 +341,6 @@ export function register(app, basePath = '') {
             payload.enabled = Boolean(req.body.enabled);
         }
 
-        if (req.body.clientversion !== undefined) {
-            payload.clientversion = req.body.clientversion ? String(req.body.clientversion).trim() : null;
-        }
-
         if (req.body.pairingpin !== undefined) {
             payload.pairingpin = req.body.pairingpin ? String(req.body.pairingpin).trim() : null;
         }