diff --git a/docs/settings.md b/docs/settings.md
index 0f03c54d90..634196dbea 100644
--- a/docs/settings.md
+++ b/docs/settings.md
@@ -97,7 +97,7 @@ Legend:
 | `max-gif-size`                       | int                                                              | `3145728`  | No   |        | Maximum file size for clients to render gifs previews with animation                                                                                                                                                                                                             |
 | `session-ping-limit`                 | int                                                              | `200`      | No   |        | Number of sessions the HPB can ping in a single request                                                                                                                                                                                                                          |
 | `token_entropy`                      | int                                                              | `8`        | No   |        | Length of conversation tokens, can be increased to make tokens harder to guess but reduces readability and dial-in comfort                                                                                                                                                       |
-| `default_group_notification`         | int                                                              | `2`        | No   | 🖌️    | Default notification level for group conversations [constants list](constants.md#participant-notification-levels)                                                                                                                                                                |
+| `default_group_notification`         | int                                                              | `1`        | No   | 🖌️    | Default notification level for group conversations [constants list](constants.md#participant-notification-levels) (Default changed from 2 (mentions) to 1 (always) in Nextcloud 33 for new installations)                                                                        |
 | `default_permissions`                | int                                                              | `246`      | Yes  |        | Default permissions for non-moderators (see [constants list](constants.md#attendee-permissions) for bit flags)                                                                                                                                                                   |
 | `recording_consent`                  | int                                                              | `0`        | Yes  | 🖌️    | Whether users have to agree on being recorded before they can join the call (see [constants](constants.md#recording-consent-required))                                                                                                                                           |
 | `grid_videos_limit`                  | int                                                              | `19`       | No   |        | Maximum number of videos to show (additional to the own video)                                                                                                                                                                                                                   |
diff --git a/lib/Chat/Notifier.php b/lib/Chat/Notifier.php
index 0bd3ff3f82..30f35f3b93 100644
--- a/lib/Chat/Notifier.php
+++ b/lib/Chat/Notifier.php
@@ -658,7 +658,7 @@ class Notifier {
 	}
 
 	protected function getDefaultGroupNotification(): int {
-		return (int)$this->config->getAppValue('spreed', 'default_group_notification', (string)Participant::NOTIFY_MENTION);
+		return (int)$this->config->getAppValue('spreed', 'default_group_notification', (string)Participant::NOTIFY_ALWAYS);
 	}
 
 	/**
diff --git a/lib/Migration/Version23000Date20251114105144.php b/lib/Migration/Version23000Date20251114105144.php
new file mode 100644
index 0000000000..5ff68d1efc
--- /dev/null
+++ b/lib/Migration/Version23000Date20251114105144.php
@@ -0,0 +1,39 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCA\Talk\Migration;
+
+use Closure;
+use OCA\Talk\Participant;
+use OCP\AppFramework\Services\IAppConfig;
+use OCP\Migration\IOutput;
+use OCP\Migration\SimpleMigrationStep;
+use Override;
+
+/**
+ * Persist the previous default for group notifications for installations on update.
+ */
+class Version23000Date20251114105144 extends SimpleMigrationStep {
+	public function __construct(
+		protected readonly IAppConfig $appConfig,
+	) {
+	}
+
+	#[Override]
+	public function postSchemaChange(IOutput $output, Closure $schemaClosure, array $options): void {
+		// Persist the previous default for group notifications for installations on update.
+		$previous = $this->appConfig->getAppValueInt('default_group_notification', Participant::NOTIFY_DEFAULT);
+		if ($previous === Participant::NOTIFY_DEFAULT) {
+			$this->appConfig->setAppValueInt(
+				'default_group_notification',
+				Participant::NOTIFY_MENTION,
+			);
+		}
+	}
+}
diff --git a/lib/Notification/FederationChatNotifier.php b/lib/Notification/FederationChatNotifier.php
index 2db7077013..0553bd88bf 100644
--- a/lib/Notification/FederationChatNotifier.php
+++ b/lib/Notification/FederationChatNotifier.php
@@ -74,7 +74,7 @@ class FederationChatNotifier {
 		}
 
 		// Also notify default participants in one-to-one chats or when the admin default is "always"
-		$defaultLevel = $this->appConfig->getAppValueInt('default_group_notification', Participant::NOTIFY_MENTION);
+		$defaultLevel = $this->appConfig->getAppValueInt('default_group_notification', Participant::NOTIFY_ALWAYS);
 		if ($notificationLevel === Participant::NOTIFY_MENTION
 			|| ($defaultLevel !== Participant::NOTIFY_NEVER && $notificationLevel === Participant::NOTIFY_DEFAULT)) {
 			if ($this->isRepliedTo($room, $participant, $metaData)) {
diff --git a/lib/Service/RoomFormatter.php b/lib/Service/RoomFormatter.php
index ebfb32e543..1868e9c826 100644
--- a/lib/Service/RoomFormatter.php
+++ b/lib/Service/RoomFormatter.php
@@ -288,7 +288,7 @@ class RoomFormatter {
 			} else {
 				$adminSetting = (int)$this->serverConfig->getAppValue('spreed', 'default_group_notification', (string)Participant::NOTIFY_DEFAULT);
 				if ($adminSetting === Participant::NOTIFY_DEFAULT) {
-					$roomData['notificationLevel'] = Participant::NOTIFY_MENTION;
+					$roomData['notificationLevel'] = Participant::NOTIFY_ALWAYS;
 				} else {
 					$roomData['notificationLevel'] = $adminSetting;
 				}
diff --git a/lib/Settings/Admin/AdminSettings.php b/lib/Settings/Admin/AdminSettings.php
index 36675872d9..2ebe222a73 100644
--- a/lib/Settings/Admin/AdminSettings.php
+++ b/lib/Settings/Admin/AdminSettings.php
@@ -71,7 +71,7 @@ class AdminSettings implements ISettings {
 	}
 
 	protected function initGeneralSettings(): void {
-		$this->initialState->provideInitialState('default_group_notification', (int)$this->serverConfig->getAppValue('spreed', 'default_group_notification', (string)Participant::NOTIFY_MENTION));
+		$this->initialState->provideInitialState('default_group_notification', (int)$this->serverConfig->getAppValue('spreed', 'default_group_notification', (string)Participant::NOTIFY_ALWAYS));
 		$this->initialState->provideInitialState('conversations_files', (int)$this->serverConfig->getAppValue('spreed', 'conversations_files', '1'));
 		$this->initialState->provideInitialState('conversations_files_public_shares', (int)$this->serverConfig->getAppValue('spreed', 'conversations_files_public_shares', '1'));
 		$this->initialState->provideInitialState('valid_apache_php_configuration', $this->validApachePHPConfiguration());
diff --git a/tests/integration/run.sh b/tests/integration/run.sh
index f03cfe92ff..4a4028ec2f 100755
--- a/tests/integration/run.sh
+++ b/tests/integration/run.sh
@@ -172,6 +172,8 @@ for OCC in occ_host occ_remote; do
 	${OCC} config:system:set debug --value true --type bool
 	# Use faster password hashing
 	${OCC} config:system:set hashing_default_password --value=true --type=bool
+	# Change the default group notification level for more variate in default tests
+	${OCC} config:app:set spreed default_group_notification --value=2 --type=integer
 
 	# Build skip list
 	MAJOR_VERSION=$(${OCC} status | grep -Eo 'version: ([0-9]+).' | grep -Eo '[0-9]+')