diff --git a/gradle.properties b/gradle.properties
index 09bed8d5c3..36c2baae5e 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -9,7 +9,7 @@ commonsCodecVersion=1.16.0
 hamcrestVersion=2.2
 jacksonVersion=2.15.3
 junitJupiterVersion=5.10.1
-kotlinVersion=1.9.20
+kotlinVersion=1.9.21
 mavenVersion=3.9.4
 nativeBuildToolsVersion=0.9.28
 springFrameworkVersion=6.1.2-SNAPSHOT