diff --git a/build.gradle b/build.gradle
index 9b309ce56..56197f770 100644
--- a/build.gradle
+++ b/build.gradle
@@ -18,7 +18,7 @@ plugins {
     id "net.ltgt.errorprone" version '4.3.0'
     //
     // Kotlin just for tests - not production code
-    id 'org.jetbrains.kotlin.jvm' version '2.2.20'
+    id 'org.jetbrains.kotlin.jvm' version '2.2.21'
 }
 
 java {