diff --git a/Backend/src/models/pricealarms/pricealarms.router.ts b/Backend/src/models/pricealarms/pricealarms.router.ts
index 4e0e014..469c1c5 100644
--- a/Backend/src/models/pricealarms/pricealarms.router.ts
+++ b/Backend/src/models/pricealarms/pricealarms.router.ts
@@ -85,3 +85,45 @@ pricealarmsRouter.post('/create', async (req: Request, res: Response) => {
         res.status(500).send(JSON.stringify({'message': 'Internal Server Error. Try again later.'}));
     }
 });
+
+// PUT pricealarms/update
+pricealarmsRouter.put('/update', async (req: Request, res: Response) => {
+    try {
+        // Authenticate user
+        const session_id = req.body.session_id;
+        const session_key = req.body.session_key;
+        const user_ip = req.connection.remoteAddress ?? '';
+
+        if (!session_id || !session_key) {
+            // Missing
+            res.status(400).send(JSON.stringify({message: 'Missing parameters'}));
+            return;
+        }
+
+        const user = await UserService.checkSession(session_id, session_key, user_ip);
+
+        // Get info for price alarm creation
+        const alarm_id = req.body.alarm_id;
+        const defined_price = req.body.defined_price;
+
+        if (!alarm_id || !defined_price) {
+            // Missing
+            res.status(400).send(JSON.stringify({message: 'Missing parameters'}));
+            return;
+        }
+
+        // Create price alarm
+        const success = await PriceAlarmsService.updatePriceAlarm(alarm_id, user.user_id, defined_price);
+
+        if (success) {
+            res.status(201).send(JSON.stringify({success: true}));
+            return;
+        } else {
+            res.status(500).send(JSON.stringify({success: false}));
+            return;
+        }
+    } catch (e) {
+        console.log('Error handling a request: ' + e.message);
+        res.status(500).send(JSON.stringify({'message': 'Internal Server Error. Try again later.'}));
+    }
+});
diff --git a/Backend/src/models/pricealarms/pricealarms.service.ts b/Backend/src/models/pricealarms/pricealarms.service.ts
index ef44db6..279b05b 100644
--- a/Backend/src/models/pricealarms/pricealarms.service.ts
+++ b/Backend/src/models/pricealarms/pricealarms.service.ts
@@ -76,3 +76,31 @@ export const getPriceAlarms = async (user_id: number): Promise<PriceAlarms> => {
         }
     }
 };
+
+/**
+ * Updates the given price alarm with the given fields
+ * @param alarm_id The id of the price alarm to update
+ * @param user_id The id of the user that wants to update the price alarm
+ * @param defined_price The defined price for the price alarm
+ */
+export const updatePriceAlarm = async (alarm_id: number, user_id: number, defined_price: number): Promise<Boolean> => {
+    let conn;
+    try {
+        conn = await pool.getConnection();
+        const res = await conn.query('UPDATE price_alarms SET defined_price = ? WHERE alarm_id = ? AND user_id = ?', [defined_price, alarm_id, user_id]);
+
+        if (res.affectedRows === 1) {
+            return true;
+        } else {
+            return false;
+        }
+    } catch (err) {
+        throw err;
+    } finally {
+        if (conn) {
+            conn.end();
+        }
+    }
+
+    return false;
+};