diff --git a/CHANGELOG.md b/CHANGELOG.md
index be0d48d..092438a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,7 @@
 ## [Unreleased]
 
 ### Changed
+- Dependencies - upgrade `org.jetbrains.kotlin.jvm` to `1.8.21`
 - Dependencies (GitHub Actions) - upgrade `JetBrains/qodana-action` to `v2023.1.0`
 - Upgrade Gradle Wrapper to `8.1.1`
 
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index 68e781b..e2ba88e 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -4,7 +4,7 @@ annotations = "24.0.1"
 
 # plugins
 dokka = "1.8.10"
-kotlin = "1.8.20"
+kotlin = "1.8.21"
 changelog = "2.0.0"
 gradleIntelliJPlugin = "1.13.3"
 qodana = "0.1.13"