diff --git a/README.md b/README.md
index c2d0560bf..136b76610 100644
--- a/README.md
+++ b/README.md
@@ -7,7 +7,7 @@
 
 [![Kotlin Experimental](https://kotl.in/badges/experimental.svg)](https://kotlinlang.org/docs/components-stability.html)
 [![Official JetBrains project](http://jb.gg/badges/official.svg)](https://confluence.jetbrains.com/display/ALL/JetBrains+on+GitHub)
-[![Kotlin](https://img.shields.io/badge/kotlin-2.0.0--2.1.20-blue.svg?logo=kotlin)](http://kotlinlang.org)
+[![Kotlin](https://img.shields.io/badge/kotlin-2.0.0--2.1.21-blue.svg?logo=kotlin)](http://kotlinlang.org)
 [![GitHub License](https://img.shields.io/badge/license-Apache%20License%202.0-blue.svg?style=flat)](http://www.apache.org/licenses/LICENSE-2.0)
 
 [//]: # ([![TeamCity build](https://img.shields.io/teamcity/build/s/Build_kRPC_All.svg?server=http%3A%2F%2Fkrpc.teamcity.com)](https://teamcity.jetbrains.com/viewType.html?buildTypeId=Build_kRPC_All&guest=1))
@@ -114,8 +114,8 @@ that will set up code generation in a project.
 Example of a setup in a project's `build.gradle.kts`:
 ```kotlin
 plugins {
-    kotlin("multiplatform") version "2.1.20"
-    kotlin("plugin.serialization") version "2.1.20"
+    kotlin("multiplatform") version "2.1.21"
+    kotlin("plugin.serialization") version "2.1.21"
     id("org.jetbrains.kotlinx.rpc.plugin") version "0.6.2"
 }
 ```
@@ -177,7 +177,7 @@ For a working example, see the [sample gRPC project](/samples/grpc-app).
 ## Kotlin compatibility
 We support all stable Kotlin versions starting from 2.0.0:
 - 2.0.0, 2.0.10, 2.0.20, 2.0.21
-- 2.1.0, 2.1.10, 2.1.20
+- 2.1.0, 2.1.10, 2.1.20, 2.1.21
 
 For a full compatibility checklist, 
 see [Versions](https://kotlin.github.io/kotlinx-rpc/versions.html).
diff --git a/docs/pages/kotlinx-rpc/topics/versions.topic b/docs/pages/kotlinx-rpc/topics/versions.topic
index e82ca3a0b..5532ec839 100644
--- a/docs/pages/kotlinx-rpc/topics/versions.topic
+++ b/docs/pages/kotlinx-rpc/topics/versions.topic
@@ -22,7 +22,7 @@
         </p>
         <list>
             <li>2.0.0, 2.0.10, 2.0.20, 2.0.21</li>
-            <li>2.1.0, 2.1.10, 2.1.20</li>
+            <li>2.1.0, 2.1.10, 2.1.20, 2.1.21</li>
         </list>
         <p>
             Our code generation will support these versions (See more on <a anchor="code-generation-artifacts">code generation artifacts</a>).
diff --git a/docs/pages/kotlinx-rpc/v.list b/docs/pages/kotlinx-rpc/v.list
index fe60c6d14..c0c629f0c 100644
--- a/docs/pages/kotlinx-rpc/v.list
+++ b/docs/pages/kotlinx-rpc/v.list
@@ -15,5 +15,5 @@
 
     <!--  Library versions  -->
     <var name="kotlinx-rpc-version" value="0.6.2"/>
-    <var name="kotlin-version" value="2.1.20"/>
+    <var name="kotlin-version" value="2.1.21"/>
 </vars>
diff --git a/versions-root/kotlin-versions-lookup.csv b/versions-root/kotlin-versions-lookup.csv
index 981786a1e..9564395c8 100644
--- a/versions-root/kotlin-versions-lookup.csv
+++ b/versions-root/kotlin-versions-lookup.csv
@@ -1,4 +1,5 @@
 Kotlin,atomicfu,serialization,detekt-gradle-plugin,gradle-kotlin-dsl,binary-compatibility-validator,kover
+2.1.21,0.27.0,1.8.1,1.23.8,5.1.2,0.17.0,0.9.1
 2.1.20,0.27.0,1.8.1,1.23.8,5.1.2,0.17.0,0.9.1
 2.1.10,0.27.0,1.8.1,1.23.8,5.1.2,0.17.0,0.9.1
 2.1.0,0.27.0,1.8.1,1.23.8,5.1.2,0.17.0,0.9.1
diff --git a/versions-root/libs.versions.toml b/versions-root/libs.versions.toml
index b2dc733f9..2b03b4593 100644
--- a/versions-root/libs.versions.toml
+++ b/versions-root/libs.versions.toml
@@ -3,7 +3,7 @@
 kotlinx-rpc = "0.7.0-SNAPSHOT"
 
 # kotlin
-kotlin-lang = "2.1.20" # or env.KOTLIN_VERSION
+kotlin-lang = "2.1.21" # or env.KOTLIN_VERSION
 kotlin-compiler = "0.0.0" # default to kotlin-lang or env.KOTLIN_COMPILER_VERSION
 
 # kotlin independent versions