diff --git a/settings.gradle.kts b/settings.gradle.kts
index 9f943357..de97b545 100644
--- a/settings.gradle.kts
+++ b/settings.gradle.kts
@@ -11,7 +11,7 @@ pluginManagement {
 
     plugins {
         kotlin("multiplatform") version "1.9.20"
-        kotlin("plugin.serialization") version "1.9.20"
+        kotlin("plugin.serialization") version "1.9.21"
     }
 }