diff --git a/ktor-app/build.gradle.kts b/ktor-app/build.gradle.kts
index 874a122..4069525 100644
--- a/ktor-app/build.gradle.kts
+++ b/ktor-app/build.gradle.kts
@@ -6,7 +6,7 @@ val postgres_version: String by project
 plugins {
   kotlin("jvm") version "1.9.20"
   id("io.ktor.plugin") version "2.2.4"
-  id("org.jetbrains.kotlin.plugin.serialization") version "1.8.10"
+  id("org.jetbrains.kotlin.plugin.serialization") version "1.9.20"
 }
 
 group = "org.rogervinas"