diff --git a/trees/build.gradle.kts b/trees/build.gradle.kts
index a1cbaf8..9fdd2a5 100644
--- a/trees/build.gradle.kts
+++ b/trees/build.gradle.kts
@@ -3,7 +3,7 @@ plugins {
     id("org.jetbrains.kotlin.jvm") version "1.8.10"
     id("jacoco")
     id("org.jetbrains.kotlin.plugin.noarg") version "1.8.20"
-    id("org.jetbrains.kotlin.plugin.serialization") version "1.8.10"
+    id("org.jetbrains.kotlin.plugin.serialization") version "1.9.0"
 }
 
 repositories {