diff --git a/samples/kotlin-mcp-client/gradle/libs.versions.toml b/samples/kotlin-mcp-client/gradle/libs.versions.toml
index e7cbea7f9..3844999fb 100644
--- a/samples/kotlin-mcp-client/gradle/libs.versions.toml
+++ b/samples/kotlin-mcp-client/gradle/libs.versions.toml
@@ -1,6 +1,6 @@
 [versions]
 anthropic = "2.65.0"
-kotlin = "2.4.20"
+kotlin = "2.4.21"
 ktor = "3.6.0"
 mcp-kotlin = "0.15.0"
 shadow = "9.6.1"