diff --git a/android/build.gradle b/android/build.gradle
index e53756c..c2ee8f3 100644
--- a/android/build.gradle
+++ b/android/build.gradle
@@ -2,7 +2,7 @@ group 'dev.steenbakker.nordicdfu'
 version '1.0-SNAPSHOT'
 
 buildscript {
-    ext.kotlin_version = '1.9.10'
+    ext.kotlin_version = '1.9.21'
     repositories {
         google()
         mavenCentral()