diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index 11df626..f724999 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -1,5 +1,5 @@
 [versions]
-kotlin = "2.3.20" # https://plugins.jetbrains.com/docs/intellij/using-kotlin.html#kotlin-standard-library
+kotlin = "2.3.21" # https://plugins.jetbrains.com/docs/intellij/using-kotlin.html#kotlin-standard-library
 rdGen = "2026.1.3" # https://github.com/JetBrains/rd/releases
 
 [libraries]