diff --git a/.mvn/maven.config b/.mvn/maven.config
index d267dac..f2181ac 100644
--- a/.mvn/maven.config
+++ b/.mvn/maven.config
@@ -1,3 +1,2 @@
--s.mvn\settings-local.xml
+-s.mvn/settings-local.xml
 
--Dmaven.repo.local=D:\workspace\private\.m2repo
\ No newline at end of file
diff --git a/README.md b/README.md
index ade846d..f14e838 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,11 @@
 # agiledancers
 
-To map dancegroups to performancedays
\ No newline at end of file
+To map dance groups to performance days.
+
+Requires JDK 25 and Maven 3.9.0 or newer. Set `JAVA_HOME` to your JDK 25 installation.
+
+Build and run all tests (including `*Sit` tests) from the repository root:
+
+```sh
+mvn clean verify
+```
diff --git a/agiledancers-be/src/main/java/nl/agilecc/agiledancers/model/DanceGroup.java b/agiledancers-be/src/main/java/nl/agilecc/agiledancers/model/DanceGroup.java
index c81a203..e47612a 100644
--- a/agiledancers-be/src/main/java/nl/agilecc/agiledancers/model/DanceGroup.java
+++ b/agiledancers-be/src/main/java/nl/agilecc/agiledancers/model/DanceGroup.java
@@ -4,8 +4,6 @@ import lombok.*;
 import nl.agilecc.agiledancers.model.specifications.DanceGroupStyle;
 import nl.agilecc.agiledancers.model.specifications.DanceGroupType;
 
-import java.util.Collections;
-import java.util.HashSet;
 import java.util.Set;
 
 @Getter
diff --git a/pom.xml b/pom.xml
index 49e5777..0060fc9 100644
--- a/pom.xml
+++ b/pom.xml
@@ -19,17 +19,16 @@
     <!-- TODO Add SCM ??? -->
 
     <properties>
-        <maven.compiler.source>21</maven.compiler.source>
-        <maven.compiler.target>21</maven.compiler.target>
+        <maven.compiler.release>25</maven.compiler.release>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
 
-        <ortools-java.version>9.12.4544</ortools-java.version>
-        <lombok.version>1.18.38</lombok.version>
+        <ortools-java.version>9.15.6755</ortools-java.version>
+        <lombok.version>1.18.48</lombok.version>
 
         <!-- test dependencies -->
-        <datafaker.version>2.4.3</datafaker.version>
-        <junit-jupiter.version>5.12.2</junit-jupiter.version>
+        <datafaker.version>2.7.0</datafaker.version>
+        <junit-jupiter.version>6.1.3</junit-jupiter.version>
     </properties>
 
     <!-- dependencies that can be included by child-project - without stating the version -->
@@ -67,4 +66,63 @@
         </dependency>
     </dependencies>
 
-</project>
\ No newline at end of file
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>3.16.0</version>
+                <configuration>
+                    <annotationProcessorPaths>
+                        <path>
+                            <groupId>org.projectlombok</groupId>
+                            <artifactId>lombok</artifactId>
+                            <version>${lombok.version}</version>
+                        </path>
+                    </annotationProcessorPaths>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>3.6.1</version>
+                <configuration>
+                    <includes>
+                        <include>**/Test*.java</include>
+                        <include>**/*Test.java</include>
+                        <include>**/*Tests.java</include>
+                        <include>**/*TestCase.java</include>
+                        <include>**/*Sit.java</include>
+                    </includes>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-clean-plugin</artifactId>
+                <version>3.5.0</version>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-resources-plugin</artifactId>
+                <version>3.5.0</version>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-jar-plugin</artifactId>
+                <version>3.5.1</version>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-install-plugin</artifactId>
+                <version>3.2.0</version>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-deploy-plugin</artifactId>
+                <version>3.2.0</version>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>