diff --git a/chat/build.gradle b/chat/build.gradle
index 5b7f6057..23ca7908 100644
--- a/chat/build.gradle
+++ b/chat/build.gradle
@@ -3,8 +3,8 @@ buildscript {
         mavenCentral()
     }
     dependencies {
-        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:2.0.20"
-        classpath "org.jetbrains.kotlin:kotlin-serialization:2.0.20"
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:2.0.21"
+        classpath "org.jetbrains.kotlin:kotlin-serialization:2.0.21"
     }
 }
 
@@ -37,7 +37,7 @@ kotlin {
     sourceSets {
         backendMain {
             dependencies {
-                implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:2.0.20"
+                implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:2.0.21"
                 implementation "io.ktor:ktor-server-netty"
                 implementation "io.ktor:ktor-server-websockets"
                 implementation "io.ktor:ktor-server-call-logging"
diff --git a/client-mpp/build.gradle b/client-mpp/build.gradle
index 1e99a9d3..fb13cada 100644
--- a/client-mpp/build.gradle
+++ b/client-mpp/build.gradle
@@ -5,7 +5,7 @@ buildscript {
         gradlePluginPortal()
     }
     dependencies {
-        classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:2.0.20")
+        classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:2.0.21")
         classpath("com.android.tools.build:gradle:7.0.4")
     }
 }
diff --git a/client-multipart/build.gradle b/client-multipart/build.gradle
index e1e28bb4..d5cb6219 100644
--- a/client-multipart/build.gradle
+++ b/client-multipart/build.gradle
@@ -4,7 +4,7 @@ buildscript {
         gradlePluginPortal()
     }
     dependencies {
-        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:2.0.20"
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:2.0.21"
         classpath "io.ktor.plugin:plugin:3.0.1"
     }
 }
@@ -27,7 +27,7 @@ repositories {
 }
 
 dependencies {
-    implementation 'org.jetbrains.kotlin:kotlin-stdlib-jdk8:2.0.20'
+    implementation 'org.jetbrains.kotlin:kotlin-stdlib-jdk8:2.0.21'
     implementation "io.ktor:ktor-server-html-builder"
     implementation 'ch.qos.logback:logback-classic:1.5.12'
     implementation 'io.ktor:ktor-server-netty-jvm'
diff --git a/client-tools/build.gradle b/client-tools/build.gradle
index 36945a01..a86cd805 100644
--- a/client-tools/build.gradle
+++ b/client-tools/build.gradle
@@ -4,7 +4,7 @@ buildscript {
         gradlePluginPortal()
     }
     dependencies {
-        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:2.0.20"
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:2.0.21"
         classpath "io.ktor.plugin:plugin:3.0.1"
     }
 }
@@ -27,7 +27,7 @@ repositories {
 }
 
 dependencies {
-    implementation 'org.jetbrains.kotlin:kotlin-stdlib-jdk8:2.0.20'
+    implementation 'org.jetbrains.kotlin:kotlin-stdlib-jdk8:2.0.21'
     implementation "io.ktor:ktor-server-html-builder"
     implementation 'ch.qos.logback:logback-classic:1.5.12'
     implementation 'io.ktor:ktor-server-netty-jvm'
diff --git a/di-kodein/build.gradle.kts b/di-kodein/build.gradle.kts
index dcb2d1df..bab7443e 100644
--- a/di-kodein/build.gradle.kts
+++ b/di-kodein/build.gradle.kts
@@ -2,9 +2,9 @@ val kotlin_version: String by project
 val logback_version: String by project
 
 plugins {
-    kotlin("jvm") version "2.0.20"
+    kotlin("jvm") version "2.0.21"
     id("io.ktor.plugin") version "3.0.1"
-    kotlin("plugin.serialization") version "2.0.20"
+    kotlin("plugin.serialization") version "2.0.21"
 }
 
 application {
diff --git a/di-kodein/gradle.properties b/di-kodein/gradle.properties
index e018114d..e36804ba 100644
--- a/di-kodein/gradle.properties
+++ b/di-kodein/gradle.properties
@@ -1,3 +1,3 @@
-kotlin_version=2.0.20
+kotlin_version=2.0.21
 logback_version=1.3.14
 kotlin.code.style=official
diff --git a/filelisting/build.gradle.kts b/filelisting/build.gradle.kts
index 060ac287..cc1262bf 100644
--- a/filelisting/build.gradle.kts
+++ b/filelisting/build.gradle.kts
@@ -2,7 +2,7 @@ val kotlin_version: String by project
 val logback_version: String by project
 
 plugins {
-    kotlin("jvm") version "2.0.20"
+    kotlin("jvm") version "2.0.21"
     id("io.ktor.plugin") version "3.0.1"
 }
 
diff --git a/filelisting/gradle.properties b/filelisting/gradle.properties
index e018114d..e36804ba 100644
--- a/filelisting/gradle.properties
+++ b/filelisting/gradle.properties
@@ -1,3 +1,3 @@
-kotlin_version=2.0.20
+kotlin_version=2.0.21
 logback_version=1.3.14
 kotlin.code.style=official
diff --git a/fullstack-mpp/build.gradle b/fullstack-mpp/build.gradle
index f167333a..b1a0acbe 100644
--- a/fullstack-mpp/build.gradle
+++ b/fullstack-mpp/build.gradle
@@ -6,7 +6,7 @@ buildscript {
     }
 
     dependencies {
-        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:2.0.20"
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:2.0.21"
     }
 }
 
diff --git a/graalvm/build.gradle.kts b/graalvm/build.gradle.kts
index a5be28ea..5a2715e9 100644
--- a/graalvm/build.gradle.kts
+++ b/graalvm/build.gradle.kts
@@ -1,6 +1,6 @@
 plugins {
     application
-    kotlin("jvm") version "2.0.20"
+    kotlin("jvm") version "2.0.21"
     id("io.ktor.plugin") version "3.0.1"
     id("org.graalvm.buildtools.native") version "0.9.19"
 }
diff --git a/h2/build.gradle.kts b/h2/build.gradle.kts
index b548d082..1a047f26 100644
--- a/h2/build.gradle.kts
+++ b/h2/build.gradle.kts
@@ -3,7 +3,7 @@ val logback_version: String by project
 
 plugins {
     application
-    kotlin("jvm") version "2.0.20"
+    kotlin("jvm") version "2.0.21"
     id("io.ktor.plugin") version "3.0.1"
 }
 
diff --git a/h2/gradle.properties b/h2/gradle.properties
index e018114d..e36804ba 100644
--- a/h2/gradle.properties
+++ b/h2/gradle.properties
@@ -1,3 +1,3 @@
-kotlin_version=2.0.20
+kotlin_version=2.0.21
 logback_version=1.3.14
 kotlin.code.style=official
diff --git a/httpbin/build.gradle.kts b/httpbin/build.gradle.kts
index 8494ee82..0db474c8 100644
--- a/httpbin/build.gradle.kts
+++ b/httpbin/build.gradle.kts
@@ -2,7 +2,7 @@ val kotlin_version: String by project
 val logback_version: String by project
 
 plugins {
-    kotlin("jvm") version "2.0.20"
+    kotlin("jvm") version "2.0.21"
     id("io.ktor.plugin") version "3.0.1"
 }
 
diff --git a/httpbin/gradle.properties b/httpbin/gradle.properties
index a725dae7..760f5cf2 100644
--- a/httpbin/gradle.properties
+++ b/httpbin/gradle.properties
@@ -1,4 +1,4 @@
-kotlin_version=2.0.20
+kotlin_version=2.0.21
 logback_version=1.3.14
 kotlin.code.style=official
 
diff --git a/jwt-auth-tests/build.gradle.kts b/jwt-auth-tests/build.gradle.kts
index f521ced4..e09fd3ba 100644
--- a/jwt-auth-tests/build.gradle.kts
+++ b/jwt-auth-tests/build.gradle.kts
@@ -1,6 +1,6 @@
 plugins {
-    kotlin("jvm") version "2.0.20"
-    kotlin("plugin.serialization") version "2.0.20"
+    kotlin("jvm") version "2.0.21"
+    kotlin("plugin.serialization") version "2.0.21"
     id("io.ktor.plugin") version "3.0.1"
 }
 
diff --git a/ktor-client-wasm/gradle/libs.versions.toml b/ktor-client-wasm/gradle/libs.versions.toml
index e5c2e384..1067bd6b 100644
--- a/ktor-client-wasm/gradle/libs.versions.toml
+++ b/ktor-client-wasm/gradle/libs.versions.toml
@@ -2,7 +2,7 @@
 compose = "1.6.2"
 compose-plugin = "1.6.0"
 junit = "4.13.2"
-kotlin = "2.0.20"
+kotlin = "2.0.21"
 ktor = "3.0.1"
 
 [libraries]
diff --git a/kweet/build.gradle.kts b/kweet/build.gradle.kts
index 955769f2..262730ef 100644
--- a/kweet/build.gradle.kts
+++ b/kweet/build.gradle.kts
@@ -3,9 +3,9 @@ val logback_version: String by project
 val exposed_version: String by project
 
 plugins {
-    kotlin("jvm") version "2.0.20"
+    kotlin("jvm") version "2.0.21"
     id("io.ktor.plugin") version "3.0.1"
-    kotlin("plugin.serialization") version "2.0.20"
+    kotlin("plugin.serialization") version "2.0.21"
 }
 
 application {
diff --git a/location-header/build.gradle.kts b/location-header/build.gradle.kts
index cfaee74f..22327c23 100644
--- a/location-header/build.gradle.kts
+++ b/location-header/build.gradle.kts
@@ -2,7 +2,7 @@ val kotlin_version: String by project
 val logback_version: String by project
 
 plugins {
-    kotlin("jvm") version "2.0.20"
+    kotlin("jvm") version "2.0.21"
     id("io.ktor.plugin") version "3.0.1"
 }
 
diff --git a/maven-google-appengine-standard/pom.xml b/maven-google-appengine-standard/pom.xml
index f7676d27..85e20a7b 100644
--- a/maven-google-appengine-standard/pom.xml
+++ b/maven-google-appengine-standard/pom.xml
@@ -11,7 +11,7 @@
     <artifactId>maven-google-appengine-standard</artifactId>
 
     <properties>
-        <kotlin.version>2.0.20</kotlin.version>
+        <kotlin.version>2.0.21</kotlin.version>
         <slf4j.version>1.7.36</slf4j.version>
         <appengine.version>2.0.31</appengine.version>
         <servlet.version>4.0.1</servlet.version>
diff --git a/mongodb/build.gradle.kts b/mongodb/build.gradle.kts
index cc62594e..c98edbea 100644
--- a/mongodb/build.gradle.kts
+++ b/mongodb/build.gradle.kts
@@ -3,9 +3,9 @@ val logback_version: String by project
 val mongodb_version: String by project
 
 plugins {
-    kotlin("jvm") version "2.0.20"
+    kotlin("jvm") version "2.0.21"
     id("io.ktor.plugin") version "3.0.1"
-    id("org.jetbrains.kotlin.plugin.serialization") version "2.0.20"
+    id("org.jetbrains.kotlin.plugin.serialization") version "2.0.21"
 }
 
 group = "com.example"
diff --git a/mongodb/gradle.properties b/mongodb/gradle.properties
index 92fcb6fa..a03f49eb 100644
--- a/mongodb/gradle.properties
+++ b/mongodb/gradle.properties
@@ -1,4 +1,4 @@
-kotlin_version=2.0.20
+kotlin_version=2.0.21
 logback_version=1.3.14
 mongodb_version=4.8.0
 kotlin.code.style=official
diff --git a/mvc-web/build.gradle.kts b/mvc-web/build.gradle.kts
index 8367077d..ae92fc96 100644
--- a/mvc-web/build.gradle.kts
+++ b/mvc-web/build.gradle.kts
@@ -4,9 +4,9 @@ val h2_version: String by project
 val exposed_version: String by project
 
 plugins {
-    kotlin("jvm") version "2.0.20"
+    kotlin("jvm") version "2.0.21"
     id("io.ktor.plugin") version "2.3.6"
-    id("org.jetbrains.kotlin.plugin.serialization") version "2.0.20"
+    id("org.jetbrains.kotlin.plugin.serialization") version "2.0.21"
 }
 
 group = "com.example"
diff --git a/mvc-web/gradle.properties b/mvc-web/gradle.properties
index 78d7aac2..aaefe182 100644
--- a/mvc-web/gradle.properties
+++ b/mvc-web/gradle.properties
@@ -1,4 +1,4 @@
-kotlin_version=2.0.20
+kotlin_version=2.0.21
 logback_version=1.4.11
 exposed_version=0.41.1
 h2_version=2.1.214
diff --git a/native-image-server-with-yaml-config/build.gradle.kts b/native-image-server-with-yaml-config/build.gradle.kts
index ecc9a0b5..bc7c604b 100644
--- a/native-image-server-with-yaml-config/build.gradle.kts
+++ b/native-image-server-with-yaml-config/build.gradle.kts
@@ -3,9 +3,9 @@ val kotlin_version: String by project
 val logback_version: String by project
 
 plugins {
-    kotlin("jvm") version "2.0.10"
+    kotlin("jvm") version "2.0.21"
     id("io.ktor.plugin") version "3.0.1"
-    id("org.jetbrains.kotlin.plugin.serialization") version "2.0.10"
+    id("org.jetbrains.kotlin.plugin.serialization") version "2.0.21"
     id("org.graalvm.buildtools.native") version "0.10.2"
 }
 
diff --git a/native-image-server-with-yaml-config/gradle.properties b/native-image-server-with-yaml-config/gradle.properties
index cdfc7cf1..3cb4e8df 100644
--- a/native-image-server-with-yaml-config/gradle.properties
+++ b/native-image-server-with-yaml-config/gradle.properties
@@ -1,4 +1,4 @@
 kotlin.code.style=official
 ktor_version=3.0.1
-kotlin_version=2.0.10
+kotlin_version=2.0.21
 logback_version=1.4.14
diff --git a/opentelemetry/client/build.gradle.kts b/opentelemetry/client/build.gradle.kts
index 7b25b0aa..8ac30be3 100644
--- a/opentelemetry/client/build.gradle.kts
+++ b/opentelemetry/client/build.gradle.kts
@@ -4,7 +4,7 @@ val kotlin_version: String by project
 val opentelemetry_version: String by project
 
 plugins {
-    kotlin("jvm") version "2.0.20"
+    kotlin("jvm") version "2.0.21"
     id("io.ktor.plugin") version "3.0.1"
     id("application")
 }
diff --git a/opentelemetry/server/build.gradle.kts b/opentelemetry/server/build.gradle.kts
index 4fba41c4..26f4ea0a 100644
--- a/opentelemetry/server/build.gradle.kts
+++ b/opentelemetry/server/build.gradle.kts
@@ -4,7 +4,7 @@ val opentelemetry_version: String by project
 val logback_version: String by project
 
 plugins {
-    kotlin("jvm") version "2.0.20"
+    kotlin("jvm") version "2.0.21"
     id("io.ktor.plugin") version "3.0.1"
     id("application")
 }
diff --git a/opentelemetry/shared/build.gradle.kts b/opentelemetry/shared/build.gradle.kts
index 507dd765..6d2269b7 100644
--- a/opentelemetry/shared/build.gradle.kts
+++ b/opentelemetry/shared/build.gradle.kts
@@ -4,7 +4,7 @@ val opentelemetry_exporter_otlp_version: String by project
 val opentelemetry_sdk_extension_autoconfigure_version: String by project
 
 plugins {
-    kotlin("jvm") version "2.0.20"
+    kotlin("jvm") version "2.0.21"
     id("io.ktor.plugin") version "3.0.1"
 }
 
diff --git a/postgres/build.gradle.kts b/postgres/build.gradle.kts
index efc9d31d..1464a45a 100644
--- a/postgres/build.gradle.kts
+++ b/postgres/build.gradle.kts
@@ -2,9 +2,9 @@ val kotlin_version: String by project
 val logback_version: String by project
 
 plugins {
-    kotlin("jvm") version "2.0.20"
+    kotlin("jvm") version "2.0.21"
     id("io.ktor.plugin") version "2.2.3"
-    id("org.jetbrains.kotlin.plugin.serialization") version "2.0.20"
+    id("org.jetbrains.kotlin.plugin.serialization") version "2.0.21"
 }
 
 group = "com.example"
diff --git a/postgres/gradle.properties b/postgres/gradle.properties
index e018114d..e36804ba 100644
--- a/postgres/gradle.properties
+++ b/postgres/gradle.properties
@@ -1,3 +1,3 @@
-kotlin_version=2.0.20
+kotlin_version=2.0.21
 logback_version=1.3.14
 kotlin.code.style=official
diff --git a/redirect-with-exception/build.gradle.kts b/redirect-with-exception/build.gradle.kts
index 65fc5d29..c5851a90 100644
--- a/redirect-with-exception/build.gradle.kts
+++ b/redirect-with-exception/build.gradle.kts
@@ -2,7 +2,7 @@ val kotlin_version: String by project
 val logback_version: String by project
 
 plugins {
-    kotlin("jvm") version "2.0.20"
+    kotlin("jvm") version "2.0.21"
     id("io.ktor.plugin") version "3.0.1"
 }
 
diff --git a/reverse-proxy-ws/build.gradle.kts b/reverse-proxy-ws/build.gradle.kts
index dc8ec76e..91a4d3f6 100644
--- a/reverse-proxy-ws/build.gradle.kts
+++ b/reverse-proxy-ws/build.gradle.kts
@@ -2,7 +2,7 @@ val kotlin_version: String by project
 val logback_version: String by project
 
 plugins {
-    kotlin("jvm") version "2.0.20"
+    kotlin("jvm") version "2.0.21"
     id("io.ktor.plugin") version "3.0.1"
 }
 
diff --git a/reverse-proxy/build.gradle.kts b/reverse-proxy/build.gradle.kts
index ca6ea9d7..3fdf9505 100644
--- a/reverse-proxy/build.gradle.kts
+++ b/reverse-proxy/build.gradle.kts
@@ -2,7 +2,7 @@ val kotlin_version: String by project
 val logback_version: String by project
 
 plugins {
-    kotlin("jvm") version "2.0.20"
+    kotlin("jvm") version "2.0.21"
     id("io.ktor.plugin") version "3.0.1"
 }
 
diff --git a/rx/build.gradle.kts b/rx/build.gradle.kts
index 5f4a939e..2231107a 100644
--- a/rx/build.gradle.kts
+++ b/rx/build.gradle.kts
@@ -2,7 +2,7 @@ val kotlin_version: String by project
 val logback_version: String by project
 
 plugins {
-    kotlin("jvm") version "2.0.20"
+    kotlin("jvm") version "2.0.21"
     id("io.ktor.plugin") version "3.0.1"
 }
 
diff --git a/sse/build.gradle.kts b/sse/build.gradle.kts
index 9f086de7..f72053ca 100644
--- a/sse/build.gradle.kts
+++ b/sse/build.gradle.kts
@@ -2,7 +2,7 @@ val kotlin_version: String by project
 val logback_version: String by project
 
 plugins {
-    kotlin("jvm") version "2.0.20"
+    kotlin("jvm") version "2.0.21"
     id("io.ktor.plugin") version "3.0.1"
 }
 
diff --git a/structured-logging/build.gradle.kts b/structured-logging/build.gradle.kts
index 2fd09d03..aeb19951 100644
--- a/structured-logging/build.gradle.kts
+++ b/structured-logging/build.gradle.kts
@@ -2,7 +2,7 @@ val kotlin_version: String by project
 val logback_version: String by project
 
 plugins {
-    kotlin("jvm") version "2.0.20"
+    kotlin("jvm") version "2.0.21"
     id("io.ktor.plugin") version "3.0.1"
 }
 
diff --git a/version-diff/build.gradle.kts b/version-diff/build.gradle.kts
index 8b82515f..a248f31d 100644
--- a/version-diff/build.gradle.kts
+++ b/version-diff/build.gradle.kts
@@ -2,9 +2,9 @@ val kotlin_version: String by project
 val logback_version: String by project
 
 plugins {
-    kotlin("jvm") version "2.0.20"
+    kotlin("jvm") version "2.0.21"
     id("io.ktor.plugin") version "3.0.1"
-    kotlin("plugin.serialization") version "2.0.20"
+    kotlin("plugin.serialization") version "2.0.21"
 }
 
 group = "org.example"
diff --git a/youkube/build.gradle.kts b/youkube/build.gradle.kts
index 6697d62d..c282b3fc 100644
--- a/youkube/build.gradle.kts
+++ b/youkube/build.gradle.kts
@@ -2,9 +2,9 @@ val kotlin_version: String by project
 val logback_version: String by project
 
 plugins {
-    kotlin("jvm") version "2.0.20"
+    kotlin("jvm") version "2.0.21"
     id("io.ktor.plugin") version "3.0.1"
-    kotlin("plugin.serialization") version "2.0.20"
+    kotlin("plugin.serialization") version "2.0.21"
 }
 
 application {