diff --git a/build.gradle.kts b/build.gradle.kts
index 4d011d2..02fde2c 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -5,7 +5,7 @@ plugins {
     // Apply the Kotlin JVM plugin to add support for Kotlin.
     id("org.jetbrains.kotlin.jvm") version "1.7.10"
     // Kotlinx serialization for any data format
-    kotlin("plugin.serialization") version "1.7.10"
+    kotlin("plugin.serialization") version "1.9.21"
     // Shade the plugin
     id("com.github.johnrengelman.shadow") version "7.0.0"
     // Allow publishing