diff --git a/graphql-dgs-codegen-core/build.gradle b/graphql-dgs-codegen-core/build.gradle
index 2fd1758d..988362f9 100644
--- a/graphql-dgs-codegen-core/build.gradle
+++ b/graphql-dgs-codegen-core/build.gradle
@@ -35,7 +35,7 @@ dependencies {
     implementation 'com.squareup:kotlinpoet:2.2.+'
     implementation 'com.github.ajalt.clikt:clikt:5.0.+'
 
-    implementation 'org.jetbrains.kotlinx:kotlinx-serialization-json:1.8.+'
+    implementation 'org.jetbrains.kotlinx:kotlinx-serialization-json:1.9.+'
     implementation 'jakarta.annotation:jakarta.annotation-api:3.0.+'
 
     testImplementation 'com.google.guava:guava:33.4.+'