diff --git a/2021/kotlin/build.gradle.kts b/2021/kotlin/build.gradle.kts
index 2ed19c4..4c143da 100644
--- a/2021/kotlin/build.gradle.kts
+++ b/2021/kotlin/build.gradle.kts
@@ -1,5 +1,5 @@
 plugins {
-    kotlin("jvm") version "1.9.23"
+    kotlin("jvm") version "1.9.25"
     application
 }