diff --git a/build.gradle.kts b/build.gradle.kts
index 35a4c7e852..1ab4a43612 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -1,6 +1,6 @@
 plugins {
   kotlin("jvm") version "1.9.20" apply false
-  kotlin("plugin.serialization") version "1.9.20" apply false
+  kotlin("plugin.serialization") version "1.9.21" apply false
   id("io.bkbn.sourdough.library.jvm") version "0.12.1" apply false
   id("io.bkbn.sourdough.application.jvm") version "0.12.1" apply false
   id("io.bkbn.sourdough.root") version "0.12.1"