diff --git a/samples/weather-stdio-server/gradle/libs.versions.toml b/samples/weather-stdio-server/gradle/libs.versions.toml
index a580416a..dff90a0f 100644
--- a/samples/weather-stdio-server/gradle/libs.versions.toml
+++ b/samples/weather-stdio-server/gradle/libs.versions.toml
@@ -1,6 +1,6 @@
 [versions]
 coroutines = "1.10.2"
-kotlin = "2.2.21"
+kotlin = "2.3.20"
 ktor = "3.2.3"
 logging = "8.0.01"
 mcp-kotlin = "0.9.0"