diff --git a/src/components/voucher/voucher.controller.js b/src/components/voucher/voucher.controller.js
index b71755d..7c54182 100644
--- a/src/components/voucher/voucher.controller.js
+++ b/src/components/voucher/voucher.controller.js
@@ -232,20 +232,52 @@ export const redeemVoucher = async (req, res) => {
 export const updateVoucher = async (req, res) => {
   try {
     const { code } = req.params;
-    const [updated] = await Voucher.update(req.body, {
-      where: { code }
-    });
+    const {
+      name,
+      discount,
+      redemption,
+      start_date,
+      expiration_date,
+      is_active,
+      customer_id
+    } = req.body;
 
-    if (updated) {
-      const updatedVoucher = await Voucher.findOne({ where: { code } });
-      const response = formatVoucherResponse(updatedVoucher);
-      res.json(response);
-    } else {
-      res.status(404).json({ error: 'Voucher not found' });
+    const voucher = await Voucher.findOne({ where: { code } });
+
+    if (!voucher) {
+      return res.status(404).json({
+        error: 'Voucher not found'
+      });
     }
+
+    const updateData = {
+      name,
+      discountType: discount?.type,
+      discountAmount: discount?.type === 'AMOUNT' ? discount.amount_off : discount.percent_off,
+      maxDiscountAmount: discount?.amount_limit || 0,
+      maxRedemptions: redemption?.quantity,
+      dailyQuota: redemption?.daily_quota,
+      startDate: start_date,
+      expirationDate: expiration_date,
+      isActive: is_active,
+      customerId: customer_id
+    };
+
+    // Remove undefined values
+    Object.keys(updateData).forEach(key => 
+      updateData[key] === undefined && delete updateData[key]
+    );
+
+    await voucher.update(updateData);
+    
+    // Fetch updated voucher to return
+    const updatedVoucher = await Voucher.findOne({ where: { code } });
+    return res.json(formatVoucherResponse(updatedVoucher));
   } catch (error) {
-    console.error('Update voucher error:', error);
-    res.status(400).json({ error: 'Error updating voucher' });
+    console.error('Error updating voucher:', error);
+    return res.status(500).json({
+      error: 'Failed to update voucher'
+    });
   }
 };
 
diff --git a/src/components/voucher/voucher.routes.js b/src/components/voucher/voucher.routes.js
index e74fc69..fdae236 100644
--- a/src/components/voucher/voucher.routes.js
+++ b/src/components/voucher/voucher.routes.js
@@ -1,5 +1,5 @@
 import express from 'express';
-import { createVoucher, getVouchers, getVoucherByCode, redeemVoucher, getRedemptionHistory } from './voucher.controller.js';
+import { createVoucher, getVouchers, getVoucherByCode, redeemVoucher, getRedemptionHistory, updateVoucher } from './voucher.controller.js';
 import { authenticateToken } from '../auth/auth.middleware.js';
 
 const router = express.Router();
@@ -264,6 +264,70 @@ const router = express.Router();
  *           application/json:
  *             schema:
  *               $ref: '#/components/schemas/Error'
+ *   put:
+ *     summary: Update a voucher
+ *     tags: [Vouchers]
+ *     security:
+ *       - bearerAuth: []
+ *     parameters:
+ *       - in: path
+ *         name: code
+ *         required: true
+ *         schema:
+ *           type: string
+ *     requestBody:
+ *       required: true
+ *       content:
+ *         application/json:
+ *           schema:
+ *             type: object
+ *             properties:
+ *               name:
+ *                 type: string
+ *               discount:
+ *                 $ref: '#/components/schemas/Discount'
+ *               redemption:
+ *                 type: object
+ *                 properties:
+ *                   quantity:
+ *                     type: integer
+ *                   daily_quota:
+ *                     type: integer
+ *               start_date:
+ *                 type: string
+ *                 format: date-time
+ *               expiration_date:
+ *                 type: string
+ *                 format: date-time
+ *               is_active:
+ *                 type: boolean
+ *               customer_id:
+ *                 type: string
+ *     responses:
+ *       200:
+ *         description: Voucher updated successfully
+ *         content:
+ *           application/json:
+ *             schema:
+ *               $ref: '#/components/schemas/VoucherResponse'
+ *       400:
+ *         description: Invalid request
+ *         content:
+ *           application/json:
+ *             schema:
+ *               $ref: '#/components/schemas/Error'
+ *       401:
+ *         description: Unauthorized
+ *         content:
+ *           application/json:
+ *             schema:
+ *               $ref: '#/components/schemas/Error'
+ *       404:
+ *         description: Voucher not found
+ *         content:
+ *           application/json:
+ *             schema:
+ *               $ref: '#/components/schemas/Error'
  */
 
 /**
@@ -384,5 +448,6 @@ router.get('/', authenticateToken, getVouchers);
 router.get('/redemptions', authenticateToken, getRedemptionHistory);
 router.get('/:code', authenticateToken, getVoucherByCode);
 router.post('/:code/redeem', authenticateToken, redeemVoucher);
+router.put('/:code', authenticateToken, updateVoucher);
 
 export default router;