diff --git a/asyncapi-core/src/main/java/com/asyncapi/v2/_0_0/model/AsyncAPI.java b/asyncapi-core/src/main/java/com/asyncapi/v2/_0_0/model/AsyncAPI.java
index 790ef520..c6515f0b 100644
--- a/asyncapi-core/src/main/java/com/asyncapi/v2/_0_0/model/AsyncAPI.java
+++ b/asyncapi-core/src/main/java/com/asyncapi/v2/_0_0/model/AsyncAPI.java
@@ -44,6 +44,7 @@ public class AsyncAPI extends ExtendableObject {
      * and tooling should typically be compatible with the corresponding major.minor (1.0.*).
      * Patch versions will correspond to patches of this document.
      */
+    @Builder.Default
     @NotNull
     @Builder.Default
     private final String asyncapi = "2.0.0";
diff --git a/asyncapi-core/src/main/java/com/asyncapi/v2/_6_0/model/AsyncAPI.java b/asyncapi-core/src/main/java/com/asyncapi/v2/_6_0/model/AsyncAPI.java
index 017409dd..335fe4ad 100644
--- a/asyncapi-core/src/main/java/com/asyncapi/v2/_6_0/model/AsyncAPI.java
+++ b/asyncapi-core/src/main/java/com/asyncapi/v2/_6_0/model/AsyncAPI.java
@@ -46,6 +46,7 @@ public class AsyncAPI extends ExtendableObject {
      * and tooling should typically be compatible with the corresponding major.minor (1.0.*).
      * Patch versions will correspond to patches of this document.
      */
+    @Builder.Default
     @NotNull
     @Builder.Default
     private final String asyncapi = "2.6.0";
diff --git a/pom.xml b/pom.xml
index 9b3b6d45..391729ad 100644
--- a/pom.xml
+++ b/pom.xml
@@ -55,6 +55,7 @@
         <lombok.version>1.18.26</lombok.version>
         <junit5.version>5.9.2</junit5.version>
         <dokka.version>1.7.0</dokka.version>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     </properties>
 
     <dependencies>
@@ -209,6 +210,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
+                <version>3.11.0</version>
                 <executions>
                     <execution>
                         <id>compile</id>