diff --git a/build.gradle b/build.gradle
index 4d538cf7..9a6d3523 100644
--- a/build.gradle
+++ b/build.gradle
@@ -83,15 +83,14 @@ modifyPom {
 repositories {
    mavenLocal()
    mavenCentral()
-   jcenter()
 }
 
 dependencies {
    // https://mvnrepository.com/artifact/org.fulib/fulibScenarios
-   fulibScenarios group: 'org.fulib', name: 'fulibScenarios', version: '1.6.2'
+   fulibScenarios group: 'org.fulib', name: 'fulibScenarios', version: '1.7.0'
 
    // https://mvnrepository.com/artifact/org.antlr/antlr4
-   antlr group: 'org.antlr', name: 'antlr4', version: '4.9.1'
+   antlr group: 'org.antlr', name: 'antlr4', version: '4.9.2'
 
    // https://mvnrepository.com/artifact/org.fulib/fulibYaml
    api group: 'org.fulib', name: 'fulibYaml', version: '1.5.0'
@@ -100,24 +99,24 @@ dependencies {
    implementation group: 'org.antlr', name: 'ST4', version: '4.3.1'
 
    // https://mvnrepository.com/artifact/org.antlr/antlr4-runtime
-   implementation group: 'org.antlr', name: 'antlr4-runtime', version: '4.9.1'
+   implementation group: 'org.antlr', name: 'antlr4-runtime', version: '4.9.2'
 
    // https://mvnrepository.com/artifact/org.hamcrest/hamcrest-library
    testImplementation group: 'org.hamcrest', name: 'hamcrest-library', version: '2.2'
 
    // https://mvnrepository.com/artifact/org.junit.jupiter/junit-jupiter-api
-   testImplementation group: 'org.junit.jupiter', name: 'junit-jupiter-api', version: '5.7.1'
+   testImplementation group: 'org.junit.jupiter', name: 'junit-jupiter-api', version: '5.7.2'
 
    // https://mvnrepository.com/artifact/org.junit.jupiter/junit-jupiter-params
-   testImplementation group: 'org.junit.jupiter', name: 'junit-jupiter-params', version: '5.7.1'
+   testImplementation group: 'org.junit.jupiter', name: 'junit-jupiter-params', version: '5.7.2'
 
    // https://mvnrepository.com/artifact/org.junit.jupiter/junit-jupiter-engine
-   testRuntimeOnly group: 'org.junit.jupiter', name: 'junit-jupiter-engine', version: '5.7.1'
+   testRuntimeOnly group: 'org.junit.jupiter', name: 'junit-jupiter-engine', version: '5.7.2'
 
-   genCompile sourceSets.main.output + sourceSets.main.runtimeClasspath
+   genImplementation sourceSets.main.output + sourceSets.main.runtimeClasspath
 
    // https://mvnrepository.com/artifact/org.fulib/fulibTools
-   genCompile group: 'org.fulib', name: 'fulibTools', version: '1.4.1'
+   genImplementation group: 'org.fulib', name: 'fulibTools', version: '1.5.1'
 }
 
 if (JavaVersion.current().java11Compatible) {
diff --git a/src/main/java/org/fulib/classmodel/Attribute.java b/src/main/java/org/fulib/classmodel/Attribute.java
index 59394083..39fbffd7 100644
--- a/src/main/java/org/fulib/classmodel/Attribute.java
+++ b/src/main/java/org/fulib/classmodel/Attribute.java
@@ -171,6 +171,7 @@ private static String buildTypeSignature(String type)
     *
     * @since 1.5
     */
+   @Deprecated
    public boolean isBoolean()
    {
       return Type.BOOLEAN.equals(this.type);
diff --git a/test/build.gradle b/test/build.gradle
index ff6b2eac..b8ddd7dc 100644
--- a/test/build.gradle
+++ b/test/build.gradle
@@ -9,12 +9,11 @@ version = '0.1.0'
 repositories {
    mavenLocal()
    mavenCentral()
-   jcenter()
 }
 
 dependencies {
    // https://mvnrepository.com/artifact/org.fulib/fulibScenarios
-   fulibScenarios group: 'org.fulib', name: 'fulibScenarios', version: '1.4.2', {
+   fulibScenarios group: 'org.fulib', name: 'fulibScenarios', version: '1.7.0', {
       exclude group: 'org.fulib', module: 'fulib'
    }
 
@@ -22,16 +21,16 @@ dependencies {
    fulibScenarios rootProject
 
    // https://mvnrepository.com/artifact/it.unimi.dsi/fastutil
-   def fastUtil = [ group: 'it.unimi.dsi', name: 'fastutil', version: '8.4.2' ]
+   def fastUtil = [ group: 'it.unimi.dsi', name: 'fastutil', version: '8.5.4' ]
 
-   compile fastUtil
-   genCompile fastUtil
+   implementation fastUtil
+   genImplementation fastUtil
 
    // https://mvnrepository.com/artifact/junit/junit
-   testCompile group: 'junit', name: 'junit', version: '4.13'
+   testImplementation group: 'junit', name: 'junit', version: '4.13.2'
 
    // https://mvnrepository.com/artifact/org.fulib/fulibTools
-   testCompile group: 'org.fulib', name: 'fulibTools', version: '1.2.1'
+   testImplementation group: 'org.fulib', name: 'fulibTools', version: '1.5.1'
 }
 
 generateScenarioSource {
diff --git a/test/doc/images/studyRightObjects.png b/test/doc/images/studyRightObjects.png
index 6492763c..3d85dfd8 100644
Binary files a/test/doc/images/studyRightObjects.png and b/test/doc/images/studyRightObjects.png differ
diff --git a/test/src/main/java/de/uniks/studyright/classDiagram.png b/test/src/main/java/de/uniks/studyright/classDiagram.png
index d7ec1a39..e29543e5 100644
Binary files a/test/src/main/java/de/uniks/studyright/classDiagram.png and b/test/src/main/java/de/uniks/studyright/classDiagram.png differ
diff --git a/test/src/main/java/org/fulib/docs/classDiagram.png b/test/src/main/java/org/fulib/docs/classDiagram.png
index 9d3cdeab..6979ed70 100644
Binary files a/test/src/main/java/org/fulib/docs/classDiagram.png and b/test/src/main/java/org/fulib/docs/classDiagram.png differ
diff --git a/test/src/main/java/org/fulib/docs/dtos/dto/classDiagram.png b/test/src/main/java/org/fulib/docs/dtos/dto/classDiagram.png
index dc3d3919..7d9b3577 100644
Binary files a/test/src/main/java/org/fulib/docs/dtos/dto/classDiagram.png and b/test/src/main/java/org/fulib/docs/dtos/dto/classDiagram.png differ
diff --git a/test/src/main/java/org/fulib/docs/dtos/model/classDiagram.png b/test/src/main/java/org/fulib/docs/dtos/model/classDiagram.png
index a3f54b3b..30c5bff5 100644
Binary files a/test/src/main/java/org/fulib/docs/dtos/model/classDiagram.png and b/test/src/main/java/org/fulib/docs/dtos/model/classDiagram.png differ