diff --git a/.drone.jsonnet b/.drone.jsonnet
index e16c161194d..693e48e6513 100644
--- a/.drone.jsonnet
+++ b/.drone.jsonnet
@@ -14,9 +14,9 @@ local Pipeline(test_set, database, services) = {
 			image: "ghcr.io/nextcloud/continuous-integration-php8.2:latest",
 			environment: {
 				APP_NAME: "spreed",
-				CORE_BRANCH: "master",
+				CORE_BRANCH: "stable26",
 				GUESTS_BRANCH: "master",
-				NOTIFICATIONS_BRANCH: "master",
+				NOTIFICATIONS_BRANCH: "stable26",
 				DATABASEHOST: database
 			},
 			commands: [
diff --git a/.drone.yml b/.drone.yml
index 1953c73653c..a4503fb4966 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -23,10 +23,10 @@ steps:
   - bash run.sh features/callapi
   environment:
     APP_NAME: spreed
-    CORE_BRANCH: master
+    CORE_BRANCH: stable26
     DATABASEHOST: sqlite
     GUESTS_BRANCH: master
-    NOTIFICATIONS_BRANCH: master
+    NOTIFICATIONS_BRANCH: stable26
   image: ghcr.io/nextcloud/continuous-integration-php8.2:latest
   name: integration-callapi
 trigger:
@@ -60,10 +60,10 @@ steps:
   - bash run.sh features/chat
   environment:
     APP_NAME: spreed
-    CORE_BRANCH: master
+    CORE_BRANCH: stable26
     DATABASEHOST: sqlite
     GUESTS_BRANCH: master
-    NOTIFICATIONS_BRANCH: master
+    NOTIFICATIONS_BRANCH: stable26
   image: ghcr.io/nextcloud/continuous-integration-php8.2:latest
   name: integration-chat
 trigger:
@@ -97,10 +97,10 @@ steps:
   - bash run.sh features/chat-2
   environment:
     APP_NAME: spreed
-    CORE_BRANCH: master
+    CORE_BRANCH: stable26
     DATABASEHOST: sqlite
     GUESTS_BRANCH: master
-    NOTIFICATIONS_BRANCH: master
+    NOTIFICATIONS_BRANCH: stable26
   image: ghcr.io/nextcloud/continuous-integration-php8.2:latest
   name: integration-chat-2
 trigger:
@@ -134,10 +134,10 @@ steps:
   - bash run.sh features/command
   environment:
     APP_NAME: spreed
-    CORE_BRANCH: master
+    CORE_BRANCH: stable26
     DATABASEHOST: sqlite
     GUESTS_BRANCH: master
-    NOTIFICATIONS_BRANCH: master
+    NOTIFICATIONS_BRANCH: stable26
   image: ghcr.io/nextcloud/continuous-integration-php8.2:latest
   name: integration-command
 trigger:
@@ -172,10 +172,10 @@ steps:
   - bash run.sh features/conversation
   environment:
     APP_NAME: spreed
-    CORE_BRANCH: master
+    CORE_BRANCH: stable26
     DATABASEHOST: sqlite
     GUESTS_BRANCH: master
-    NOTIFICATIONS_BRANCH: master
+    NOTIFICATIONS_BRANCH: stable26
   image: ghcr.io/nextcloud/continuous-integration-php8.2:latest
   name: integration-conversation
 trigger:
@@ -210,10 +210,10 @@ steps:
   - bash run.sh features/conversation-2
   environment:
     APP_NAME: spreed
-    CORE_BRANCH: master
+    CORE_BRANCH: stable26
     DATABASEHOST: sqlite
     GUESTS_BRANCH: master
-    NOTIFICATIONS_BRANCH: master
+    NOTIFICATIONS_BRANCH: stable26
   image: ghcr.io/nextcloud/continuous-integration-php8.2:latest
   name: integration-conversation-2
 trigger:
@@ -247,10 +247,10 @@ steps:
   - bash run.sh features/federation
   environment:
     APP_NAME: spreed
-    CORE_BRANCH: master
+    CORE_BRANCH: stable26
     DATABASEHOST: sqlite
     GUESTS_BRANCH: master
-    NOTIFICATIONS_BRANCH: master
+    NOTIFICATIONS_BRANCH: stable26
   image: ghcr.io/nextcloud/continuous-integration-php8.2:latest
   name: integration-federation
 trigger:
@@ -284,10 +284,10 @@ steps:
   - bash run.sh features/integration
   environment:
     APP_NAME: spreed
-    CORE_BRANCH: master
+    CORE_BRANCH: stable26
     DATABASEHOST: sqlite
     GUESTS_BRANCH: master
-    NOTIFICATIONS_BRANCH: master
+    NOTIFICATIONS_BRANCH: stable26
   image: ghcr.io/nextcloud/continuous-integration-php8.2:latest
   name: integration-integration
 trigger:
@@ -321,10 +321,10 @@ steps:
   - bash run.sh features/sharing
   environment:
     APP_NAME: spreed
-    CORE_BRANCH: master
+    CORE_BRANCH: stable26
     DATABASEHOST: sqlite
     GUESTS_BRANCH: master
-    NOTIFICATIONS_BRANCH: master
+    NOTIFICATIONS_BRANCH: stable26
   image: ghcr.io/nextcloud/continuous-integration-php8.2:latest
   name: integration-sharing
 trigger:
@@ -358,10 +358,10 @@ steps:
   - bash run.sh features/sharing-2
   environment:
     APP_NAME: spreed
-    CORE_BRANCH: master
+    CORE_BRANCH: stable26
     DATABASEHOST: sqlite
     GUESTS_BRANCH: master
-    NOTIFICATIONS_BRANCH: master
+    NOTIFICATIONS_BRANCH: stable26
   image: ghcr.io/nextcloud/continuous-integration-php8.2:latest
   name: integration-sharing-2
 trigger:
@@ -409,10 +409,10 @@ steps:
   - bash run.sh features/callapi
   environment:
     APP_NAME: spreed
-    CORE_BRANCH: master
+    CORE_BRANCH: stable26
     DATABASEHOST: mysql
     GUESTS_BRANCH: master
-    NOTIFICATIONS_BRANCH: master
+    NOTIFICATIONS_BRANCH: stable26
   image: ghcr.io/nextcloud/continuous-integration-php8.2:latest
   name: integration-callapi
 trigger:
@@ -460,10 +460,10 @@ steps:
   - bash run.sh features/chat
   environment:
     APP_NAME: spreed
-    CORE_BRANCH: master
+    CORE_BRANCH: stable26
     DATABASEHOST: mysql
     GUESTS_BRANCH: master
-    NOTIFICATIONS_BRANCH: master
+    NOTIFICATIONS_BRANCH: stable26
   image: ghcr.io/nextcloud/continuous-integration-php8.2:latest
   name: integration-chat
 trigger:
@@ -511,10 +511,10 @@ steps:
   - bash run.sh features/chat-2
   environment:
     APP_NAME: spreed
-    CORE_BRANCH: master
+    CORE_BRANCH: stable26
     DATABASEHOST: mysql
     GUESTS_BRANCH: master
-    NOTIFICATIONS_BRANCH: master
+    NOTIFICATIONS_BRANCH: stable26
   image: ghcr.io/nextcloud/continuous-integration-php8.2:latest
   name: integration-chat-2
 trigger:
@@ -562,10 +562,10 @@ steps:
   - bash run.sh features/command
   environment:
     APP_NAME: spreed
-    CORE_BRANCH: master
+    CORE_BRANCH: stable26
     DATABASEHOST: mysql
     GUESTS_BRANCH: master
-    NOTIFICATIONS_BRANCH: master
+    NOTIFICATIONS_BRANCH: stable26
   image: ghcr.io/nextcloud/continuous-integration-php8.2:latest
   name: integration-command
 trigger:
@@ -614,10 +614,10 @@ steps:
   - bash run.sh features/conversation
   environment:
     APP_NAME: spreed
-    CORE_BRANCH: master
+    CORE_BRANCH: stable26
     DATABASEHOST: mysql
     GUESTS_BRANCH: master
-    NOTIFICATIONS_BRANCH: master
+    NOTIFICATIONS_BRANCH: stable26
   image: ghcr.io/nextcloud/continuous-integration-php8.2:latest
   name: integration-conversation
 trigger:
@@ -666,10 +666,10 @@ steps:
   - bash run.sh features/conversation-2
   environment:
     APP_NAME: spreed
-    CORE_BRANCH: master
+    CORE_BRANCH: stable26
     DATABASEHOST: mysql
     GUESTS_BRANCH: master
-    NOTIFICATIONS_BRANCH: master
+    NOTIFICATIONS_BRANCH: stable26
   image: ghcr.io/nextcloud/continuous-integration-php8.2:latest
   name: integration-conversation-2
 trigger:
@@ -717,10 +717,10 @@ steps:
   - bash run.sh features/federation
   environment:
     APP_NAME: spreed
-    CORE_BRANCH: master
+    CORE_BRANCH: stable26
     DATABASEHOST: mysql
     GUESTS_BRANCH: master
-    NOTIFICATIONS_BRANCH: master
+    NOTIFICATIONS_BRANCH: stable26
   image: ghcr.io/nextcloud/continuous-integration-php8.2:latest
   name: integration-federation
 trigger:
@@ -768,10 +768,10 @@ steps:
   - bash run.sh features/integration
   environment:
     APP_NAME: spreed
-    CORE_BRANCH: master
+    CORE_BRANCH: stable26
     DATABASEHOST: mysql
     GUESTS_BRANCH: master
-    NOTIFICATIONS_BRANCH: master
+    NOTIFICATIONS_BRANCH: stable26
   image: ghcr.io/nextcloud/continuous-integration-php8.2:latest
   name: integration-integration
 trigger:
@@ -819,10 +819,10 @@ steps:
   - bash run.sh features/sharing
   environment:
     APP_NAME: spreed
-    CORE_BRANCH: master
+    CORE_BRANCH: stable26
     DATABASEHOST: mysql
     GUESTS_BRANCH: master
-    NOTIFICATIONS_BRANCH: master
+    NOTIFICATIONS_BRANCH: stable26
   image: ghcr.io/nextcloud/continuous-integration-php8.2:latest
   name: integration-sharing
 trigger:
@@ -870,10 +870,10 @@ steps:
   - bash run.sh features/sharing-2
   environment:
     APP_NAME: spreed
-    CORE_BRANCH: master
+    CORE_BRANCH: stable26
     DATABASEHOST: mysql
     GUESTS_BRANCH: master
-    NOTIFICATIONS_BRANCH: master
+    NOTIFICATIONS_BRANCH: stable26
   image: ghcr.io/nextcloud/continuous-integration-php8.2:latest
   name: integration-sharing-2
 trigger:
@@ -916,10 +916,10 @@ steps:
   - bash run.sh features/callapi
   environment:
     APP_NAME: spreed
-    CORE_BRANCH: master
+    CORE_BRANCH: stable26
     DATABASEHOST: pgsql
     GUESTS_BRANCH: master
-    NOTIFICATIONS_BRANCH: master
+    NOTIFICATIONS_BRANCH: stable26
   image: ghcr.io/nextcloud/continuous-integration-php8.2:latest
   name: integration-callapi
 trigger:
@@ -963,10 +963,10 @@ steps:
   - bash run.sh features/chat
   environment:
     APP_NAME: spreed
-    CORE_BRANCH: master
+    CORE_BRANCH: stable26
     DATABASEHOST: pgsql
     GUESTS_BRANCH: master
-    NOTIFICATIONS_BRANCH: master
+    NOTIFICATIONS_BRANCH: stable26
   image: ghcr.io/nextcloud/continuous-integration-php8.2:latest
   name: integration-chat
 trigger:
@@ -1010,10 +1010,10 @@ steps:
   - bash run.sh features/chat-2
   environment:
     APP_NAME: spreed
-    CORE_BRANCH: master
+    CORE_BRANCH: stable26
     DATABASEHOST: pgsql
     GUESTS_BRANCH: master
-    NOTIFICATIONS_BRANCH: master
+    NOTIFICATIONS_BRANCH: stable26
   image: ghcr.io/nextcloud/continuous-integration-php8.2:latest
   name: integration-chat-2
 trigger:
@@ -1057,10 +1057,10 @@ steps:
   - bash run.sh features/command
   environment:
     APP_NAME: spreed
-    CORE_BRANCH: master
+    CORE_BRANCH: stable26
     DATABASEHOST: pgsql
     GUESTS_BRANCH: master
-    NOTIFICATIONS_BRANCH: master
+    NOTIFICATIONS_BRANCH: stable26
   image: ghcr.io/nextcloud/continuous-integration-php8.2:latest
   name: integration-command
 trigger:
@@ -1105,10 +1105,10 @@ steps:
   - bash run.sh features/conversation
   environment:
     APP_NAME: spreed
-    CORE_BRANCH: master
+    CORE_BRANCH: stable26
     DATABASEHOST: pgsql
     GUESTS_BRANCH: master
-    NOTIFICATIONS_BRANCH: master
+    NOTIFICATIONS_BRANCH: stable26
   image: ghcr.io/nextcloud/continuous-integration-php8.2:latest
   name: integration-conversation
 trigger:
@@ -1153,10 +1153,10 @@ steps:
   - bash run.sh features/conversation-2
   environment:
     APP_NAME: spreed
-    CORE_BRANCH: master
+    CORE_BRANCH: stable26
     DATABASEHOST: pgsql
     GUESTS_BRANCH: master
-    NOTIFICATIONS_BRANCH: master
+    NOTIFICATIONS_BRANCH: stable26
   image: ghcr.io/nextcloud/continuous-integration-php8.2:latest
   name: integration-conversation-2
 trigger:
@@ -1200,10 +1200,10 @@ steps:
   - bash run.sh features/federation
   environment:
     APP_NAME: spreed
-    CORE_BRANCH: master
+    CORE_BRANCH: stable26
     DATABASEHOST: pgsql
     GUESTS_BRANCH: master
-    NOTIFICATIONS_BRANCH: master
+    NOTIFICATIONS_BRANCH: stable26
   image: ghcr.io/nextcloud/continuous-integration-php8.2:latest
   name: integration-federation
 trigger:
@@ -1247,10 +1247,10 @@ steps:
   - bash run.sh features/integration
   environment:
     APP_NAME: spreed
-    CORE_BRANCH: master
+    CORE_BRANCH: stable26
     DATABASEHOST: pgsql
     GUESTS_BRANCH: master
-    NOTIFICATIONS_BRANCH: master
+    NOTIFICATIONS_BRANCH: stable26
   image: ghcr.io/nextcloud/continuous-integration-php8.2:latest
   name: integration-integration
 trigger:
@@ -1294,10 +1294,10 @@ steps:
   - bash run.sh features/sharing
   environment:
     APP_NAME: spreed
-    CORE_BRANCH: master
+    CORE_BRANCH: stable26
     DATABASEHOST: pgsql
     GUESTS_BRANCH: master
-    NOTIFICATIONS_BRANCH: master
+    NOTIFICATIONS_BRANCH: stable26
   image: ghcr.io/nextcloud/continuous-integration-php8.2:latest
   name: integration-sharing
 trigger:
@@ -1341,10 +1341,10 @@ steps:
   - bash run.sh features/sharing-2
   environment:
     APP_NAME: spreed
-    CORE_BRANCH: master
+    CORE_BRANCH: stable26
     DATABASEHOST: pgsql
     GUESTS_BRANCH: master
-    NOTIFICATIONS_BRANCH: master
+    NOTIFICATIONS_BRANCH: stable26
   image: ghcr.io/nextcloud/continuous-integration-php8.2:latest
   name: integration-sharing-2
 trigger:
diff --git a/.github/workflows/phpunit-mysql.yml b/.github/workflows/phpunit-mysql.yml
index 6508c8b7880..5cc0153a844 100644
--- a/.github/workflows/phpunit-mysql.yml
+++ b/.github/workflows/phpunit-mysql.yml
@@ -39,7 +39,7 @@ jobs:
     strategy:
       matrix:
         php-versions: ['8.0', '8.1', '8.2']
-        server-versions: ['master']
+        server-versions: ['stable26']
 
     services:
       mysql:
diff --git a/.github/workflows/phpunit-oci.yml b/.github/workflows/phpunit-oci.yml
index 9424f7d26a8..516df00663e 100644
--- a/.github/workflows/phpunit-oci.yml
+++ b/.github/workflows/phpunit-oci.yml
@@ -39,7 +39,7 @@ jobs:
     strategy:
       matrix:
         php-versions: ['8.0']
-        server-versions: ['master']
+        server-versions: ['stable26']
 
     services:
       oracle:
diff --git a/.github/workflows/phpunit-pgsql.yml b/.github/workflows/phpunit-pgsql.yml
index 16a470ad845..859306145c5 100644
--- a/.github/workflows/phpunit-pgsql.yml
+++ b/.github/workflows/phpunit-pgsql.yml
@@ -39,7 +39,7 @@ jobs:
     strategy:
       matrix:
         php-versions: ['8.0']
-        server-versions: ['master']
+        server-versions: ['stable26']
 
     services:
       postgres:
diff --git a/.github/workflows/phpunit-sqlite.yml b/.github/workflows/phpunit-sqlite.yml
index 5a17f4ea92e..93ed4452be5 100644
--- a/.github/workflows/phpunit-sqlite.yml
+++ b/.github/workflows/phpunit-sqlite.yml
@@ -39,7 +39,7 @@ jobs:
     strategy:
       matrix:
         php-versions: ['8.0']
-        server-versions: ['master']
+        server-versions: ['stable26']
 
     steps:
       - name: Set app env