diff --git a/samples/exposed-ktor/build.gradle.kts b/samples/exposed-ktor/build.gradle.kts
index 923d7d291d..8d6c78f859 100644
--- a/samples/exposed-ktor/build.gradle.kts
+++ b/samples/exposed-ktor/build.gradle.kts
@@ -6,7 +6,7 @@ val h2Version: String by project
 
 plugins {
     kotlin("jvm") version "1.9.10"
-    id("org.jetbrains.kotlin.plugin.serialization") version "1.9.10"
+    id("org.jetbrains.kotlin.plugin.serialization") version "1.9.20"
     id("io.ktor.plugin") version "2.3.4"
 }
 
diff --git a/settings.gradle.kts b/settings.gradle.kts
index 8b8baaa44f..14be37011e 100644
--- a/settings.gradle.kts
+++ b/settings.gradle.kts
@@ -16,7 +16,7 @@ include("exposed-json")
 pluginManagement {
     plugins {
         id("org.jetbrains.kotlin.jvm") version "1.9.10"
-        id("org.jetbrains.kotlin.plugin.serialization") version "1.9.10"
+        id("org.jetbrains.kotlin.plugin.serialization") version "1.9.20"
     }
 }