diff --git a/db/knex_migrations/2025-12-29-0000-remove-line-notify.js b/db/knex_migrations/2025-12-29-0000-remove-line-notify.js
new file mode 100644
index 000000000..2011ce852
--- /dev/null
+++ b/db/knex_migrations/2025-12-29-0000-remove-line-notify.js
@@ -0,0 +1,30 @@
+exports.up = async function (knex) {
+    const notifications = await knex("notification").select("id", "config");
+    const lineNotifyIDs = [];
+
+    for (const { id, config } of notifications) {
+        try {
+            const parsedConfig = JSON.parse(config || "{}");
+            const type = typeof parsedConfig.type === "string" ? parsedConfig.type.toLowerCase() : "";
+
+            if (type === "linenotify" || type === "line-notify") {
+                lineNotifyIDs.push(id);
+            }
+        } catch (error) {
+            // Ignore invalid JSON blobs here; they are handled elsewhere in the app.
+        }
+    }
+
+    if (lineNotifyIDs.length === 0) {
+        return;
+    }
+
+    await knex.transaction(async (trx) => {
+        await trx("monitor_notification").whereIn("notification_id", lineNotifyIDs).del();
+        await trx("notification").whereIn("id", lineNotifyIDs).del();
+    });
+};
+
+exports.down = async function () {
+    // Removal of LINE Notify configs is not reversible.
+};
diff --git a/server/monitor-types/websocket-upgrade.js b/server/monitor-types/websocket-upgrade.js
index c53225306..762e8df3b 100644
--- a/server/monitor-types/websocket-upgrade.js
+++ b/server/monitor-types/websocket-upgrade.js
@@ -39,6 +39,7 @@ class WebSocketMonitorType extends MonitorType {
                 // Give user the choice to ignore Sec-WebSocket-Accept header
                 if (monitor.wsIgnoreSecWebsocketAcceptHeader && error.message === "Invalid Sec-WebSocket-Accept header") {
                     resolve([ "101 - OK", 1000 ]);
+                    return;
                 }
                 // Upgrade failed, return message to user
                 resolve([ error.message, error.code ]);
diff --git a/server/notification-providers/linenotify.js b/server/notification-providers/linenotify.js
deleted file mode 100644
index 30b2e800d..000000000
--- a/server/notification-providers/linenotify.js
+++ /dev/null
@@ -1,53 +0,0 @@
-const NotificationProvider = require("./notification-provider");
-const axios = require("axios");
-const qs = require("qs");
-const { DOWN, UP } = require("../../src/util");
-
-class LineNotify extends NotificationProvider {
-    name = "LineNotify";
-
-    /**
-     * @inheritdoc
-     */
-    async send(notification, msg, monitorJSON = null, heartbeatJSON = null) {
-        const okMsg = "Sent Successfully.";
-        const url = "https://notify-api.line.me/api/notify";
-
-        try {
-            let config = {
-                headers: {
-                    "Content-Type": "application/x-www-form-urlencoded",
-                    "Authorization": "Bearer " + notification.lineNotifyAccessToken
-                }
-            };
-            config = this.getAxiosConfigWithProxy(config);
-            if (heartbeatJSON == null) {
-                let testMessage = {
-                    "message": msg,
-                };
-                await axios.post(url, qs.stringify(testMessage), config);
-            } else if (heartbeatJSON["status"] === DOWN) {
-                let downMessage = {
-                    "message": "\n[🔴 Down]\n" +
-                        "Name: " + monitorJSON["name"] + " \n" +
-                        heartbeatJSON["msg"] + "\n" +
-                        `Time (${heartbeatJSON["timezone"]}): ${heartbeatJSON["localDateTime"]}`
-                };
-                await axios.post(url, qs.stringify(downMessage), config);
-            } else if (heartbeatJSON["status"] === UP) {
-                let upMessage = {
-                    "message": "\n[✅ Up]\n" +
-                        "Name: " + monitorJSON["name"] + " \n" +
-                        heartbeatJSON["msg"] + "\n" +
-                        `Time (${heartbeatJSON["timezone"]}): ${heartbeatJSON["localDateTime"]}`
-                };
-                await axios.post(url, qs.stringify(upMessage), config);
-            }
-            return okMsg;
-        } catch (error) {
-            this.throwGeneralAxiosError(error);
-        }
-    }
-}
-
-module.exports = LineNotify;
diff --git a/server/notification.js b/server/notification.js
index e25bca08b..555f10cc1 100644
--- a/server/notification.js
+++ b/server/notification.js
@@ -25,7 +25,6 @@ const HeiiOnCall = require("./notification-providers/heii-oncall");
 const Keep = require("./notification-providers/keep");
 const Kook = require("./notification-providers/kook");
 const Line = require("./notification-providers/line");
-const LineNotify = require("./notification-providers/linenotify");
 const LunaSea = require("./notification-providers/lunasea");
 const Matrix = require("./notification-providers/matrix");
 const Mattermost = require("./notification-providers/mattermost");
@@ -124,7 +123,6 @@ class Notification {
             new Keep(),
             new Kook(),
             new Line(),
-            new LineNotify(),
             new LunaSea(),
             new Matrix(),
             new Mattermost(),
diff --git a/src/components/NotificationDialog.vue b/src/components/NotificationDialog.vue
index 98df20abb..9ed38e9cb 100644
--- a/src/components/NotificationDialog.vue
+++ b/src/components/NotificationDialog.vue
@@ -129,7 +129,6 @@ export default {
                 "Keep": "Keep",
                 "Kook": "Kook",
                 "line": "LINE Messenger",
-                "LineNotify": "LINE Notify",
                 "lunasea": "LunaSea",
                 "matrix": "Matrix",
                 "mattermost": "Mattermost",
diff --git a/src/components/notifications/LineNotify.vue b/src/components/notifications/LineNotify.vue
deleted file mode 100644
index 0f6897f46..000000000
--- a/src/components/notifications/LineNotify.vue
+++ /dev/null
@@ -1,9 +0,0 @@
-<template>
-    <div class="mb-3">
-        <label for="line-notify-access-token" class="form-label">{{ $t("Access Token") }}</label>
-        <input id="line-notify-access-token" v-model="$parent.notification.lineNotifyAccessToken" type="text" class="form-control" :required="true">
-    </div>
-    <i18n-t tag="div" keypath="wayToGetLineNotifyToken" class="form-text" style="margin-top: 8px;">
-        <a href="https://notify-bot.line.me/" target="_blank">https://notify-bot.line.me/</a>
-    </i18n-t>
-</template>
diff --git a/src/components/notifications/index.js b/src/components/notifications/index.js
index 9bc4f050d..b0fa68342 100644
--- a/src/components/notifications/index.js
+++ b/src/components/notifications/index.js
@@ -24,7 +24,6 @@ import HeiiOnCall from "./HeiiOnCall.vue";
 import Keep from "./Keep.vue";
 import Kook from "./Kook.vue";
 import Line from "./Line.vue";
-import LineNotify from "./LineNotify.vue";
 import LunaSea from "./LunaSea.vue";
 import Matrix from "./Matrix.vue";
 import Mattermost from "./Mattermost.vue";
@@ -112,7 +111,6 @@ const NotificationFormList = {
     "Keep": Keep,
     "Kook": Kook,
     "line": Line,
-    "LineNotify": LineNotify,
     "lunasea": LunaSea,
     "matrix": Matrix,
     "mattermost": Mattermost,