diff --git a/.github/workflows/maven-pr.yml b/.github/workflows/maven-pr.yml
index de2ef70..428b2aa 100644
--- a/.github/workflows/maven-pr.yml
+++ b/.github/workflows/maven-pr.yml
@@ -15,10 +15,10 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4
-      - name: Set up JDK 17
+      - name: Set up JDK 21
         uses: actions/setup-java@v4
         with:
-          java-version: '17'
+          java-version: '21'
           distribution: 'temurin'
       - name: Build with Maven
         run: mvn -B package --file pom.xml
diff --git a/.github/workflows/maven-publish-snapshot.yml b/.github/workflows/maven-publish-snapshot.yml
index d2369e2..2b051b7 100644
--- a/.github/workflows/maven-publish-snapshot.yml
+++ b/.github/workflows/maven-publish-snapshot.yml
@@ -17,17 +17,17 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4
-      - name: Set up JDK 17
+      - name: Set up JDK 21
         uses: actions/setup-java@v4
         with:
-          java-version: '17'
+          java-version: '21'
           distribution: 'temurin'
           # Maven Distribution Server (step creates .m2/settings.xml)
-          server-id: 'sonatype-central'
+          server-id: 'central'
           server-username: SONATYPE_USERNAME
           server-password: SONATYPE_TOKEN
       - name: Publish to OSSRH with Apache Maven
         env:
           SONATYPE_USERNAME: ${{ secrets.OSSRH_USERNAME }}
           SONATYPE_TOKEN:  ${{ secrets.OSSRH_TOKEN }}
-        run: mvn --batch-mode deploy -P deploy-to-sonatype
+        run: mvn --batch-mode deploy
diff --git a/LICENSE.txt b/LICENSE.txt
index 94a9ed0..f288702 100644
--- a/LICENSE.txt
+++ b/LICENSE.txt
@@ -1,7 +1,7 @@
                     GNU GENERAL PUBLIC LICENSE
                        Version 3, 29 June 2007
 
- Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
  Everyone is permitted to copy and distribute verbatim copies
  of this license document, but changing it is not allowed.
 
@@ -645,7 +645,7 @@ the "copyright" line and a pointer to where the full notice is found.
     GNU General Public License for more details.
 
     You should have received a copy of the GNU General Public License
-    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 Also add information on how to contact you by electronic and paper mail.
 
@@ -664,11 +664,11 @@ might be different; for a GUI interface, you would use an "about box".
   You should also get your employer (if you work as a programmer) or school,
 if any, to sign a "copyright disclaimer" for the program, if necessary.
 For more information on this, and how to apply and follow the GNU GPL, see
-<http://www.gnu.org/licenses/>.
+<https://www.gnu.org/licenses/>.
 
   The GNU General Public License does not permit incorporating your program
 into proprietary programs.  If your program is a subroutine library, you
 may consider it more useful to permit linking proprietary applications with
 the library.  If this is what you want to do, use the GNU Lesser General
 Public License instead of this License.  But first, please read
-<http://www.gnu.org/philosophy/why-not-lgpl.html>.
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
diff --git a/pom.xml b/pom.xml
index 0b851f8..d566c76 100644
--- a/pom.xml
+++ b/pom.xml
@@ -18,10 +18,13 @@
   -->
 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
-  <groupId>org.mycore</groupId>
+  <parent>
+    <groupId>org.mycore</groupId>
+    <artifactId>mycore-parent</artifactId>
+    <version>57</version>
+  </parent>
   <artifactId>mycore-classifications</artifactId>
   <version>1.2-SNAPSHOT</version>
-  <packaging>jar</packaging>
   <description>This project provides several classifications, which are commonly used in MyCoRe repositories and applications.</description>
   <url>https://www.mycore.de/classifications/</url>
   <licenses>
@@ -41,25 +44,4 @@
     <url>https://github.com/MyCoRe-Org/mycore-classifications</url>
     <tag>HEAD</tag>
   </scm>
-  <profiles>
-    <profile>
-      <id>deploy-to-sonatype</id>
-      <build>
-        <plugins>
-          <plugin>
-            <groupId>org.sonatype.central</groupId>
-            <artifactId>central-publishing-maven-plugin</artifactId>
-            <version>0.7.0</version>
-            <extensions>true</extensions>
-            <configuration>
-              <centralSnapshotsUrl>https://central.sonatype.com/repository/maven-snapshots</centralSnapshotsUrl>
-              <publishingServerId>sonatype-central</publishingServerId>
-              <autoPublish>true</autoPublish>
-              <waitUntil>published</waitUntil>
-            </configuration>
-          </plugin>
-        </plugins>
-      </build>
-    </profile>
-  </profiles>
 </project>