diff --git a/gradle/projects.libs.versions.toml b/gradle/projects.libs.versions.toml
index af18a90d..489c5813 100644
--- a/gradle/projects.libs.versions.toml
+++ b/gradle/projects.libs.versions.toml
@@ -6,7 +6,7 @@ classgraph = "4.8.157"
 dokka = "1.8.10"
 junit = "5.9.2"
 junitLauncher = "1.9.2"
-kotlin = "1.8.21"
+kotlin = "1.9.21"
 kotest = "5.6.1"
 javaSmt = "3.14.3"
 javaCompileTesting = "0.21.0"