diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7793a6b..6f6fc0e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,7 @@
 
 ### Changes
 
+* Use Kotlin v.1.7.21.
 * Use constraintlayout v.2.1.4.
 
 
diff --git a/buildSrc/src/main/kotlin/info/metadude/kotlin/library/roadsigns/Dependencies.kt b/buildSrc/src/main/kotlin/info/metadude/kotlin/library/roadsigns/Dependencies.kt
index 516c0f4..daa61f6 100644
--- a/buildSrc/src/main/kotlin/info/metadude/kotlin/library/roadsigns/Dependencies.kt
+++ b/buildSrc/src/main/kotlin/info/metadude/kotlin/library/roadsigns/Dependencies.kt
@@ -14,7 +14,7 @@ object Plugins {
     private object Versions {
         const val android = "7.1.2"
         const val dokka = "1.6.10"
-        const val kotlin = "1.6.10"
+        const val kotlin = "1.7.21"
         const val versions = "0.44.0"
     }