diff --git a/android/samples/MobileBuyIntegration/build.gradle b/android/samples/MobileBuyIntegration/build.gradle
index cd6294da..9e3582ca 100644
--- a/android/samples/MobileBuyIntegration/build.gradle
+++ b/android/samples/MobileBuyIntegration/build.gradle
@@ -20,7 +20,7 @@ buildscript {
 plugins {
     id 'com.android.application' version '9.1.1' apply false
     id 'org.jetbrains.kotlin.android' version '2.3.20' apply false
-    id 'org.jetbrains.kotlin.plugin.serialization' version '2.3.20' apply false
+    id 'org.jetbrains.kotlin.plugin.serialization' version '2.3.21' apply false
     id 'io.gitlab.arturbosch.detekt' version '1.23.8' apply false
     id 'com.google.devtools.ksp' version '2.3.6' apply false
     id 'org.jetbrains.kotlin.plugin.compose' version '2.3.21' apply false