diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index d0bf08374..d8207835e 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -6,7 +6,7 @@ intellij = "2.18.1"
 jacoco = "0.8.13"
 jdkRelease = "25"
 # https://plugins.jetbrains.com/docs/intellij/using-kotlin.html#bundled-stdlib-versions
-kotlin = "2.3.20"
+kotlin = "2.4.20-neptune-251"
 kover = "0.9.9"
 leviathan = "4.0.0"
 # Compatible with Kotlin 2.3.20 https://github.com/ktorio/ktor/releases/tag/3.4.3