diff --git a/CHANGELOG.md b/CHANGELOG.md
index c699a75..46f82dc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,8 @@
 # QOwnNotesAPI Change Log
 
+## 21.12.0
+- enabled and tested app for Nextcloud 23
+
 ## 21.7.0
 - enabled and tested app for Nextcloud 22
 
diff --git a/appinfo/info.xml b/appinfo/info.xml
index 2592bd0..394346b 100644
--- a/appinfo/info.xml
+++ b/appinfo/info.xml
@@ -8,7 +8,7 @@
     <description><![CDATA[QOwnNotesAPI is the Nextcloud/ownCloud API for [QOwnNotes](http://www.qownnotes.org), the open source notepad for Linux, macOS and Windows, that works together with the notes application of Nextcloud/ownCloud.
 
 The only purpose of this App is to provide API access to your Nextcloud/ownCloud server for your QOwnNotes desktop installation, you cannot use this App for anything else, if you don't have QOwnNotes installed on your desktop computer!]]></description>
-    <version>21.7.0</version>
+    <version>21.12.0</version>
     <licence>agpl</licence>
     <author mail="patrizio@bekerle.com" homepage="http://www.bekerle.com/">Patrizio Bekerle</author>
     <namespace>QOwnNotesAPI</namespace>
@@ -30,6 +30,6 @@ The only purpose of this App is to provide API access to your Nextcloud/ownCloud
     <!-- dependencies -->
     <dependencies>
         <owncloud min-version="8.2" max-version="10" />
-        <nextcloud min-version="10" max-version="22" />
+        <nextcloud min-version="10" max-version="23" />
     </dependencies>
 </info>
diff --git a/appinfo/signature.json b/appinfo/signature.json
index 012d6fc..f59b045 100644
--- a/appinfo/signature.json
+++ b/appinfo/signature.json
@@ -5,12 +5,12 @@
         ".travis.yml": "a20cb1f35e30137955fb60b4a42e2228dea0b14a42196bdd420b5c236bed778b88be2bad2d3b1f3c2cd0b566aece011f1373c91f365d9516caba602440ab8c78",
         "3rdparty\/finediff\/finediff.php": "328d63a5a24fe36118dfb3c3acd01f7f88c6e89eef1d045270d4edfd3d048b70cb034888494c3cc435863034d72c71b0d6719932e902d962a71f51c376eb1bbd",
         "AUTHORS.md": "471173dfd8ee079c988b04ea7b12a7cab1d82bcc1491f8075b805ead2718fa3578fce4afb334244fb464bbc28b38f5a2b9c1d6403ee6866237832bdf7aca2e17",
-        "CHANGELOG.md": "fb00b44799925b979644e23808f2ff2caa689998d14a635bde6d102afb66e180433d88957d62bf1e5003d27f0009847560764e2a9fd5846b341a8cbb99b3596c",
+        "CHANGELOG.md": "c6d69528c188226ab3deeebf565c4f0c714530fafb9c033876618c2e95ebd7ef46d564940fd80981dee64d1b1bd850e668a10d0f5ade9edcb2f9f8489214d684",
         "COPYING": "6e90d46be391aa645bcf4dfaa67f452cb15a73749f1895633789c7763b43cc0b65d391e5e95652c9a9a2063c956e0e8099a4e1ce4b70b0636629f9eac39c1080",
         "README.md": "1d39ccc6c5c274cbd7ca931b7ee86a99241721ae04b86d4997c65ff65bccf160520029533da47ad70ec43eb88cf0f78d2128babc4a34b02e38853fa7920479b0",
         "appinfo\/app.php": "2d6434343e3933d2ca2f58d36cce09330823c454b9dfa068ffe839843e841c4f77ffded830a932f10d2d113833d81da934f7089c289b13faa0006294f7b86c64",
         "appinfo\/application.php": "aa125f7d71fbb046935af40ce08656715424d0070a84683c131e8cf18627a7a83290f6d68b372b4fbad986d6a9681e9cd40b2e8803b643e56aa97da98642ca61",
-        "appinfo\/info.xml": "80858d8fcf7bb4f9252c8333f82f7050d224b3ad8e4759b02a9ef09d026f47314bdb941abeb8a67bcb0387173406a63f7c29ae2909717e0cbe5f3f9c019e54ff",
+        "appinfo\/info.xml": "0dee9de894873a73fa9d9f116d919ec5d1c6228758c20b7495d8dc3911a74ded8203c3a80da9daa7c9fd4a03328a3658ef7265f2b09ffa4529696938b5d348fe",
         "appinfo\/routes.php": "16f370a5ea1adcae53bcfee0b4f5949a3d1bc2d56d8c1df672571e71f49ecc01194a15de74fc840fc1e69aa417dd2193aaea215a49d8df87db3809d36103f3df",
         "controller\/noteapicontroller.php": "5ab0999372597473f394e49478f57bc414b8e69b8a8e104144d42b11527ba9bac74474fb2a5950de35c5cb25d31cb0fd84e50d442afb1f5973a094d24e5271a5",
         "img\/app.svg": "3518a23d17ef9ff18ea73c96e0f382bb439436ca15383495926563d821e293eec44ce90d397a508b21fde12e40db72022081ffc954e5cd34ed992d3cbeb04171",
@@ -19,6 +19,6 @@
         "phpunit.integration.xml": "d477d2d4e122ea372352b7e3c96e6973ad6c82b04c3adeb1edf02029f1cff62240ac188b99e063c7423e7603098dd7ab89c8f146c5382d8c8a9e0a9117f70da3",
         "phpunit.xml": "c4b7fe8203adf562ae2aa01090b46d0a1337df7766285b97d5fe27be19636f5385deb08f19101305536423006deed50eb22f3cc7f6ebf5c1d2fc4fe009c961bc"
     },
-    "signature": "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",
+    "signature": "jntQ1vGktQA0BjLPJdRp3MopMB3bGwOndFhZ2kcsiqpelBnEiIF+UBya8GUsZ\/ZL2+Zmx\/Id\/30eUZD\/Y9z8qLq1ZVTsaxrJcfH7iwqtg81rwJheZIybahQIxgUNv83wt5Zs3ZqfhGDu4WDz86\/iHA+FYSKPN69JdotGUkrxRgE+rWXWc4poAi2x6u7vhBUCrfWOYzrjesfZWsx8UTD9NGrEf628YkSwYGix3t\/ZnwMoCSPOXg7xfl3Y+AuOnqAA4m8exSV5RgnQldtB0OmadSiy2EIjq+IJjJur6FHjHouVf7vk1N91uVMeIWxeB5nnazJHhjmdxw9J5crW1\/Bfn7S59IKuKlwkFJcwn0smewA8BST0cavSwDk8X4jDRISUrBRVL3XrSQ7hLjwn+oNAi0SDEKzPQv2DYVOJQ87eXyYs8MS9+eigdCbC3C94zj0KgGHtM14o79QuldkBJ6QFRxo3F+UmgYMEfQZNboot5IisrkZ6Ea3LmOkcAteN5sSx288XJ1NHGcRg1FD\/EIuU38s4ztGwmcwaNfqSYhSFynXqvoNykeWrbXCvsX6L8iDVgOMpQzoGS+WlqklRP4a4JgGnXDR0EiB+swVJ7y8z7TUklV5q9i9p9vkGPFJH8Ufb4eAhuIGny\/H+hfZeFfJ127X51z8CYHuEeYm3RVWCRUU=",
     "certificate": "-----BEGIN CERTIFICATE-----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\r\ntjczm51IDKhbh0z03BT0z10Uiz0AcsvP5SYi\r\n-----END CERTIFICATE-----"
 }
\ No newline at end of file
diff --git a/docker/Dockerfile b/docker/Dockerfile
index b2eec17..e2e70da 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -1,5 +1,5 @@
 # https://hub.docker.com/_/nextcloud/
-FROM nextcloud:22-apache
+FROM nextcloud:23-apache
 
 COPY entrypoint.sh /
 
diff --git a/docs/deployment.md b/docs/deployment.md
index 2f1dc76..60ad5a3 100644
--- a/docs/deployment.md
+++ b/docs/deployment.md
@@ -13,11 +13,12 @@
     - You should now have a `qownnotesapi-nc.tar.gz` in your git directory
     - Check the content of the archive for unwanted files (you can exclude more files in
       `docker/nextcloud/sign-app.sh`)
+- Commit and push your changes to GitHub
 - Create a new release on [QOwnNotesAPI releases](https://github.com/pbek/qownnotesapi/releases)
-  with the version like `21.7.0` as *Tag name* and *Release title* and the changelog text of the current
+  with the version like `21.12.0` as *Tag name* and *Release title* and the changelog text of the current
   release as *Release notes*
     - You also need to upload `qownnotesapi-nc.tar.gz` to the release and get its url
-      like `https://github.com/pbek/qownnotesapi/releases/download/21.7.0/qownnotesapi-nc.tar.gz`
+      like `https://github.com/pbek/qownnotesapi/releases/download/21.12.0/qownnotesapi-nc.tar.gz`
 - Take the text from *Signature for your app archive*, which was printed by the sign-app command and
   release the app at [Upload app release](https://apps.nextcloud.com/developer/apps/releases/new)
     - You need the download link to `qownnotesapi-nc.tar.gz` from the GitHub release