diff --git a/common/schema-builder/pom.xml b/common/schema-builder/pom.xml
index b3c6bf052..affee430a 100644
--- a/common/schema-builder/pom.xml
+++ b/common/schema-builder/pom.xml
@@ -38,9 +38,9 @@
 
         <!-- Kotlin support -->
         <dependency>
-            <groupId>org.jetbrains.kotlinx</groupId>
-            <artifactId>kotlinx-metadata-jvm</artifactId>
-            <version>${version.kotlinx.metadata.jvm}</version>
+            <groupId>org.jetbrains.kotlin</groupId>
+            <artifactId>kotlin-metadata-jvm</artifactId>
+            <version>${version.kotlin.metadata.jvm}</version>
         </dependency>
 
         <!-- Logging -->
diff --git a/common/schema-builder/src/main/java/io/smallrye/graphql/schema/creator/OperationCreator.java b/common/schema-builder/src/main/java/io/smallrye/graphql/schema/creator/OperationCreator.java
index 2f2a84634..c8b771275 100644
--- a/common/schema-builder/src/main/java/io/smallrye/graphql/schema/creator/OperationCreator.java
+++ b/common/schema-builder/src/main/java/io/smallrye/graphql/schema/creator/OperationCreator.java
@@ -25,14 +25,14 @@
 import io.smallrye.graphql.schema.model.Operation;
 import io.smallrye.graphql.schema.model.OperationType;
 import io.smallrye.graphql.schema.model.Reference;
-import kotlinx.metadata.Flag;
-import kotlinx.metadata.KmClassifier;
-import kotlinx.metadata.KmFunction;
-import kotlinx.metadata.KmType;
-import kotlinx.metadata.KmTypeProjection;
-import kotlinx.metadata.KmValueParameter;
-import kotlinx.metadata.jvm.KotlinClassHeader;
-import kotlinx.metadata.jvm.KotlinClassMetadata;
+import kotlin.metadata.Attributes;
+import kotlin.metadata.KmClassifier;
+import kotlin.metadata.KmFunction;
+import kotlin.metadata.KmType;
+import kotlin.metadata.KmTypeProjection;
+import kotlin.metadata.KmValueParameter;
+import kotlin.metadata.jvm.KotlinClassHeader;
+import kotlin.metadata.jvm.KotlinClassMetadata;
 
 /**
  * Creates a Operation object
@@ -176,9 +176,7 @@ private static boolean isKotlinWrappedTypeNullable(KmType kotlinType) {
             return false;
         }
         KmTypeProjection arg = kotlinType.getArguments().get(0);
-        int flags = arg.getType().getFlags();
-        boolean nullable = Flag.Type.IS_NULLABLE.invoke(flags);
-        return nullable;
+        return Attributes.isNullable(arg.getType());
     }
 
     private boolean compareParameterLists(List<KmValueParameter> kotlinParameters,
@@ -196,7 +194,7 @@ private boolean compareParameterLists(List<KmValueParameter> kotlinParameters,
         return true;
     }
 
-    private boolean compareJavaAndKotlinType(Type javaType, kotlinx.metadata.KmType kotlinType) {
+    private boolean compareJavaAndKotlinType(Type javaType, kotlin.metadata.KmType kotlinType) {
         if (kotlinType == null) {
             return false;
         }
@@ -261,7 +259,7 @@ private KotlinClassMetadata.Class toKotlinClassMetadata(AnnotationInstance metad
                 metadata.value("xs") != null ? metadata.value("xs").asString() : null,
                 metadata.value("pn") != null ? metadata.value("pn").asString() : null,
                 metadata.value("xi").asInt());
-        return (KotlinClassMetadata.Class) KotlinClassMetadata.read(classHeader);
+        return (KotlinClassMetadata.Class) KotlinClassMetadata.readStrict(classHeader);
     }
 
     private static void validateFieldType(MethodInfo methodInfo, OperationType operationType) {
diff --git a/pom.xml b/pom.xml
index 3000d9b86..2642b2dba 100644
--- a/pom.xml
+++ b/pom.xml
@@ -63,7 +63,7 @@
         <maven.compiler.source>17</maven.compiler.source>
         <maven.compiler.target>17</maven.compiler.target>
         <version.impsort.plugin>1.8.0</version.impsort.plugin>
-        <version.kotlinx.metadata.jvm>0.9.0</version.kotlinx.metadata.jvm>
+        <version.kotlin.metadata.jvm>2.1.0</version.kotlin.metadata.jvm>
         <version.kotlin.compiler>2.1.0</version.kotlin.compiler>
 
     </properties>