diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index 0ea91dd..cd90231 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -1,7 +1,7 @@
 [versions]
 gson = "2.10.1"
 kotlin = "2.0.0"
-kotest = "5.8.1"
+kotest = "5.9.1"
 dokka = "1.9.20"
 nexus-publish-gradle-plugin = "1.3.0"
 # The last version compatible with Java 8 is 0.13.2.