Bump Ktor version to 3.5.1 and add release details

codeSnippets/gradle.properties

@@ -8,9 +8,9 @@ kotlin.mpp.applyDefaultHierarchyTemplate=false
 org.gradle.java.installations.auto-download=false
 # versions
 kotlin_version = 2.3.21
-ktor_version = 3.5.0
-kotlinx_coroutines_version = 1.10.2
-kotlinx_serialization_version = 1.9.0
+ktor_version = 3.5.1
+kotlinx_coroutines_version = 1.11.0
+kotlinx_serialization_version = 1.11.0
 kotlin_css_version = 1.0.0-pre.721
 exposed_version = 1.3.0
 h2_version = 2.4.240

codeSnippets/snippets/aws-elastic-beanstalk/build.gradle.kts

@@ -3,7 +3,7 @@ val logback_version: String by project
 plugins {
     application
     kotlin("jvm")
-    id("io.ktor.plugin") version "3.5.0"
+    id("io.ktor.plugin") version "3.5.1"
 }
 
 application {

codeSnippets/snippets/client-custom-plugin-data-transformation/src/main/kotlin/com/example/plugins/DataTransformation.kt

@@ -17,7 +17,7 @@ val DataTransformationPlugin = createClientPlugin("DataTransformationPlugin") {
     }
     transformResponseBody { response, content, requestedType ->
         if (requestedType.type == User::class) {
-            val receivedContent = content.readUTF8Line()!!.split(";")
+            val receivedContent = content.readLine()!!.split(";")
             User(receivedContent[0], receivedContent[1].toInt())
         } else {
             content

codeSnippets/snippets/client-http-send/build.gradle.kts

@@ -19,7 +19,7 @@ repositories {
 
 dependencies {
     implementation("io.ktor:ktor-client-core:$ktor_version")
-    implementation("io.ktor:ktor-client-apache:$ktor_version")
+    implementation("io.ktor:ktor-client-apache5:$ktor_version")
     implementation("ch.qos.logback:logback-classic:$logback_version")
     testImplementation("junit:junit:$junit_version")
     testImplementation("org.hamcrest:hamcrest:$hamcrest_version")

codeSnippets/snippets/client-http-send/src/main/kotlin/com/example/Application.kt

@@ -1,15 +1,15 @@
 package com.example
 
 import io.ktor.client.*
-import io.ktor.client.engine.apache.*
+import io.ktor.client.engine.apache5.*
 import io.ktor.client.plugins.*
 import io.ktor.client.request.*
 import io.ktor.client.statement.*
 import kotlinx.coroutines.*
 
 fun main() {
     runBlocking {
-        val client = HttpClient(Apache)
+        val client = HttpClient(Apache5)
         client.plugin(HttpSend).intercept { request ->
             val originalCall = execute(request)
             if (originalCall.response.status.value !in 100..399) {

codeSnippets/snippets/client-json/build.gradle.kts

@@ -17,7 +17,7 @@ repositories {
 
 dependencies {
     implementation("io.ktor:ktor-client-core:$ktor_version")
-    implementation("io.ktor:ktor-client-apache:$ktor_version")
+    implementation("io.ktor:ktor-client-apache5:$ktor_version")
     implementation("io.ktor:ktor-client-content-negotiation:$ktor_version")
     implementation("io.ktor:ktor-serialization-gson:$ktor_version")
     implementation("ch.qos.logback:logback-classic:$logback_version")

codeSnippets/snippets/client-json/src/main/kotlin/com/example/JsonClient.kt

@@ -2,7 +2,7 @@ package com.example
 
 import io.ktor.client.*
 import io.ktor.client.call.*
-import io.ktor.client.engine.apache.*
+import io.ktor.client.engine.apache5.*
 import io.ktor.client.plugins.contentnegotiation.*
 import io.ktor.client.request.*
 import io.ktor.serialization.gson.*
@@ -12,7 +12,7 @@ data class Model(val name: String, val items: List<Item>)
 data class Item(val key: String, val value: String)
 
 fun main(args: Array<String>) = runBlocking<Unit> {
-    val client = HttpClient(Apache) {
+    val client = HttpClient(Apache5) {
         install(ContentNegotiation) {
             gson()
         }

codeSnippets/snippets/custom-plugin-base-api/src/main/kotlin/com/example/plugins/DataTransformation.kt

@@ -13,7 +13,7 @@ class DataTransformation {
         override fun install(pipeline: ApplicationCallPipeline, configure: Configuration.() -> Unit): DataTransformation {
             val plugin = DataTransformation()
             pipeline.receivePipeline.intercept(ApplicationReceivePipeline.Transform) { data ->
-                val newValue = (data as ByteReadChannel).readUTF8Line()?.toInt()?.plus(1)
+                val newValue = (data as ByteReadChannel).readLine()?.toInt()?.plus(1)
                 if (newValue != null) {
                     proceedWith(newValue)
                 }

codeSnippets/snippets/custom-plugin/src/main/kotlin/com/example/plugins/DataTransformationPlugin.kt

@@ -7,7 +7,7 @@ val DataTransformationPlugin = createApplicationPlugin(name = "DataTransformatio
     onCallReceive { call ->
         transformBody { data ->
             if (requestedType?.type == Int::class) {
-                val line = data.readUTF8Line() ?: "1"
+                val line = data.readLine() ?: "1"
                 line.toInt() + 1
             } else {
                 data

codeSnippets/snippets/deployment-ktor-plugin/build.gradle.kts

@@ -4,7 +4,7 @@ val logback_version: String by project
 plugins {
     application
     kotlin("jvm")
-    id("io.ktor.plugin") version "3.5.0"
+    id("io.ktor.plugin") version "3.5.1"
 }
 
 application {

codeSnippets/snippets/engine-main-custom-environment/build.gradle.kts

@@ -4,7 +4,7 @@ val logback_version: String by project
 plugins {
     application
     kotlin("jvm")
-    id("io.ktor.plugin") version "3.5.0"
+    id("io.ktor.plugin") version "3.5.1"
 }
 
 application {

codeSnippets/snippets/forwarded-header/build.gradle.kts

@@ -4,7 +4,7 @@ val logback_version: String by project
 plugins {
     application
     kotlin("jvm")
-    id("io.ktor.plugin") version "3.5.0"
+    id("io.ktor.plugin") version "3.5.1"
 }
 
 application {

codeSnippets/snippets/full-stack-task-manager/gradle/libs.versions.toml

@@ -14,7 +14,7 @@ junit = "4.13.2"
 kotlin = "2.4.0"
 kotlin-wrappers = "2026.5.3"
 kotlinx-coroutines = "1.11.0"
-ktor = "3.5.0"
+ktor = "3.5.1"
 logback = "1.5.32"
 material3 = "1.11.0-alpha07"
 kotlinx-serialization-json = "1.11.0"

codeSnippets/snippets/htmx-integration/build.gradle.kts

@@ -4,7 +4,7 @@ val logback_version: String by project
 
 plugins {
     kotlin("jvm")
-    id("io.ktor.plugin") version "3.5.0"
+    id("io.ktor.plugin") version "3.5.1"
 }
 
 group = "com.example"

codeSnippets/snippets/legacy-interactive-website/build.gradle.kts

@@ -4,7 +4,7 @@ val logback_version: String by project
 plugins {
     application
     kotlin("jvm")
-    id("io.ktor.plugin") version "3.5.0"
+    id("io.ktor.plugin") version "3.5.1"
 }
 
 application {

codeSnippets/snippets/migrating-express-ktor/gradle.properties

@@ -1,4 +1,4 @@
-ktor_version=3.5.0
-kotlin_version=2.2.20
+ktor_version=3.5.1
+kotlin_version=2.3.21
 logback_version=1.5.33
 kotlin.code.style=official

codeSnippets/snippets/openapi-spec-gen-maven/gradle/libs.versions.toml

@@ -1,6 +1,6 @@
 [versions]
 kotlin = "2.3.21"
-ktor = "3.5.0"
+ktor = "3.5.1"
 logback = "1.5.33"
 
 [libraries]

codeSnippets/snippets/openapi-spec-gen-maven/pom.xml

@@ -10,7 +10,7 @@
     <properties>
         <kotlin.code.style>official</kotlin.code.style>
         <kotlin_version>2.3.21</kotlin_version>
-        <ktor_version>3.5.0</ktor_version>
+        <ktor_version>3.5.1</ktor_version>
         <logback_version>1.5.33</logback_version>
         <slf4j_version>2.0.9</slf4j_version>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

codeSnippets/snippets/openapi-spec-gen/build.gradle.kts

@@ -5,7 +5,7 @@ val logback_version: String by project
 plugins {
     application
     kotlin("jvm")
-    id("io.ktor.plugin") version "3.5.0"
+    id("io.ktor.plugin") version "3.5.1"
 }
 
 application {

codeSnippets/snippets/opentelemetry/gradle/libs.versions.toml

@@ -1,6 +1,6 @@
 [versions]
 kotlin = "2.3.21"
-ktor = "3.5.0"
+ktor = "3.5.1"
 logback = "1.5.33"
 opentelemetry = "2.18.1-alpha"
 opentelemetry_semconv = "1.34.0"

codeSnippets/snippets/proguard/build.gradle.kts

@@ -17,7 +17,7 @@ buildscript {
 plugins {
     application
     kotlin("jvm")
-    id("io.ktor.plugin") version "3.5.0"
+    id("io.ktor.plugin") version "3.5.1"
 }
 
 application {

codeSnippets/snippets/server-websockets-sharedflow/build.gradle.kts

@@ -5,7 +5,7 @@ val logback_version: String by project
 plugins {
     application
     kotlin("jvm")
-    id("io.ktor.plugin") version "3.5.0"
+    id("io.ktor.plugin") version "3.5.1"
     kotlin("plugin.serialization").version("2.2.20")
 }
 

codeSnippets/snippets/session-cookie-client/src/main/kotlin/cookieclient/Application.kt

@@ -12,8 +12,8 @@ data class UserSession(val id: String, val count: Int)
 
 fun Application.main() {
     install(Sessions) {
-        val secretEncryptKey = hex("00112233445566778899aabbccddeeff")
-        val secretSignKey = hex("6819b57a326945c1968f45236589")
+        val secretEncryptKey = "00112233445566778899aabbccddeeff".hexToByteArray()
+        val secretSignKey = "6819b57a326945c1968f45236589".hexToByteArray()
         cookie<UserSession>("user_session") {
             cookie.path = "/"
             cookie.maxAgeInSeconds = 10

codeSnippets/snippets/session-cookie-server/src/main/kotlin/com/example/Application.kt

@@ -12,7 +12,7 @@ data class CartSession(val userID: String, val productIDs: MutableList<Int>)
 
 fun Application.main() {
     install(Sessions) {
-        val secretSignKey = hex("6819b57a326945c1968f45236589")
+        val secretSignKey = "6819b57a326945c1968f45236589".hexToByteArray()
         cookie<CartSession>("cart_session", SessionStorageMemory()) {
             cookie.path = "/"
             transform(SessionTransportTransformerMessageAuthentication(secretSignKey))

codeSnippets/snippets/session-header-server/src/main/kotlin/com/example/Application.kt

@@ -13,7 +13,7 @@ data class CartSession(val userID: String, val productIDs: MutableList<Int>)
 
 fun Application.main() {
     install(Sessions) {
-        val secretSignKey = hex("6819b57a326945c1968f45236589")
+        val secretSignKey = "6819b57a326945c1968f45236589".hexToByteArray()
         header<CartSession>("cart_session", directorySessionStorage(File("build/.sessions"))) {
             transform(SessionTransportTransformerMessageAuthentication(secretSignKey))
         }

codeSnippets/snippets/sockets-client/src/main/kotlin/com/example/Application.kt

@@ -16,7 +16,7 @@ fun main(args: Array<String>) {
 
         launch(Dispatchers.IO) {
             while (true) {
-                val greeting = receiveChannel.readUTF8Line()
+                val greeting = receiveChannel.readLine()
                 if (greeting != null) {
                     println(greeting)
                 } else {

codeSnippets/snippets/sockets-server/src/main/kotlin/com/example/Application.kt

@@ -19,7 +19,7 @@ fun main(args: Array<String>) {
                 sendChannel.writeStringUtf8("Please enter your name\n")
                 try {
                     while (true) {
-                        val name = receiveChannel.readUTF8Line()
+                        val name = receiveChannel.readLine()
                         sendChannel.writeStringUtf8("Hello, $name!\n")
                     }
                 } catch (e: Throwable) {

codeSnippets/snippets/tutorial-client-kmp/gradle/libs.versions.toml

@@ -12,8 +12,8 @@ androidx-testExt = "1.3.0"
 composeMultiplatform = "1.9.0"
 junit = "4.13.2"
 kotlin = "2.3.21"
-ktor = "3.5.0"
-kotlinx-coroutines = "1.10.2"
+ktor = "3.5.1"
+kotlinx-coroutines = "1.11.0"
 
 [libraries]
 kotlin-test = { module = "org.jetbrains.kotlin:kotlin-test", version.ref = "kotlin" }

codeSnippets/snippets/tutorial-kotlin-rpc-app/build.gradle.kts

@@ -1,7 +1,7 @@
 plugins {
     kotlin("jvm") version "2.3.0"
     kotlin("plugin.serialization") version "2.3.0"
-    id("io.ktor.plugin") version "3.5.0"
+    id("io.ktor.plugin") version "3.5.1"
     id("org.jetbrains.kotlinx.rpc.plugin") version "0.10.1"
 }
 

codeSnippets/snippets/tutorial-server-db-integration/settings.gradle.kts

@@ -15,7 +15,7 @@ dependencyResolutionManagement {
         mavenCentral()
     }
     versionCatalogs {
-        create("ktorLibs").from("io.ktor:ktor-version-catalog:3.5.0")
+        create("ktorLibs").from("io.ktor:ktor-version-catalog:3.5.1")
     }
 }
 

codeSnippets/snippets/tutorial-server-docker-compose/build.gradle.kts

@@ -8,7 +8,7 @@ val h2_version: String by project
 plugins {
     application
     kotlin("jvm")
-    id("io.ktor.plugin") version "3.5.0"
+    id("io.ktor.plugin") version "3.5.1"
     id("org.jetbrains.kotlin.plugin.serialization") version "2.2.20"
 }
 

codeSnippets/snippets/tutorial-server-get-started-maven/pom.xml

@@ -10,7 +10,7 @@
     <properties>
         <kotlin.code.style>official</kotlin.code.style>
         <kotlin_version>2.3.21</kotlin_version>
-        <ktor_version>3.5.0</ktor_version>
+        <ktor_version>3.5.1</ktor_version>
         <logback_version>1.5.33</logback_version>
         <slf4j_version>2.0.9</slf4j_version>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

codeSnippets/snippets/tutorial-server-restful-api/settings.gradle.kts

@@ -12,7 +12,7 @@ dependencyResolutionManagement {
         mavenCentral()
     }
     versionCatalogs {
-        create("ktorLibs").from("io.ktor:ktor-version-catalog:3.5.0")
+        create("ktorLibs").from("io.ktor:ktor-version-catalog:3.5.1")
     }
 }
 

codeSnippets/snippets/tutorial-server-routing-and-requests/settings.gradle.kts

@@ -12,7 +12,7 @@ dependencyResolutionManagement {
         mavenCentral()
     }
     versionCatalogs {
-        create("ktorLibs").from("io.ktor:ktor-version-catalog:3.5.0")
+        create("ktorLibs").from("io.ktor:ktor-version-catalog:3.5.1")
     }
 }
 

codeSnippets/snippets/tutorial-server-web-application/settings.gradle.kts

@@ -14,7 +14,7 @@ dependencyResolutionManagement {
         mavenCentral()
     }
     versionCatalogs {
-        create("ktorLibs").from("io.ktor:ktor-version-catalog:3.5.0")
+        create("ktorLibs").from("io.ktor:ktor-version-catalog:3.5.1")
     }
 }
 

codeSnippets/snippets/tutorial-website-static/build.gradle.kts

@@ -5,7 +5,7 @@ val logback_version: String by project
 plugins {
     application
     kotlin("jvm")
-    id("io.ktor.plugin") version "3.5.0"
+    id("io.ktor.plugin") version "3.5.1"
 }
 
 application {

help-versions.json

@@ -10,7 +10,7 @@
     "isCurrent": false
   },
   {
-    "version": "3.5.0",
+    "version": "3.5.1",
     "url": "/docs/",
     "isCurrent": true
   }

project.ihp

@@ -14,7 +14,7 @@
     <categories src="c.list"/>
     <instance src="ktor.tree"
               web-path="/docs/"
-              version="3.5.0"
+              version="3.5.1"
               id="docs"
               keymaps-mode="none"/>
 

topics/releases.md

@@ -33,6 +33,15 @@ The following table lists details of the latest Ktor releases.
 
 <table>
 <tr><td>Version</td><td>Release Date</td><td>Highlights</td></tr>
+<tr><td>3.5.1</td><td>June 26, 2026</td><td>
+<p>
+A patch release including OpenAPI plugin improvements, expanded authentication KDoc documentation, and a wide range of
+bug fixes covering Kotlin 2.4 compiler compatibility, HTTP and caching behavior, authentication, WebRTC stability, and
+platform-specific issues across JVM, Darwin, Android, and Windows.
+</p>
+<var name="version" value="3.5.1"/>
+<include from="lib.topic" element-id="release_details_link"/>
+</td></tr>
 <tr><td>3.5.0</td><td>May 15, 2026</td><td>
 <p>
 A minor release that introduces RFC 7616 Digest authentication support, custom DNS resolver configuration for OkHttp

topics/server-custom-plugins.md

@@ -142,7 +142,7 @@ handle `transformBody` inside `onCallReceive` as follows:
    used to check the requested data type.
 2. `data` is a lambda argument that allows you to receive a request body
    as [ByteReadChannel](https://api.ktor.io/ktor-io/io.ktor.utils.io/-byte-read-channel/index.html) and convert it to
-   the required type. In the example above, `ByteReadChannel.readUTF8Line` is used to read a request body.
+   the required type. In the example above, `ByteReadChannel.readLine()` is used to read a request body.
 3. Finally, you need to transform and return data. In our example, `1` is added to the received integer value.
 
 You can find the full example