diff --git a/build.gradle.kts b/build.gradle.kts
index 2f43c317d4f1..ef653d96e096 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -90,7 +90,7 @@ subprojects {
     exclude("**/CipherSuite.java")
   }
 
-  val checkstyleConfig by configurations.creating
+  val checkstyleConfig: Configuration by configurations.creating
   dependencies {
     checkstyleConfig(Dependencies.checkStyle) {
       isTransitive = false
@@ -110,7 +110,7 @@ subprojects {
     annotation = "okhttp3.internal.SuppressSignatureCheck"
     sourceSets = listOf(project.sourceSets["main"])
   }
-  val signature by configurations.getting
+  val signature: Configuration by configurations.getting
   dependencies {
     signature(Dependencies.signatureAndroid21)
     signature(Dependencies.signatureJava18)
@@ -129,7 +129,7 @@ subprojects {
   val platform = System.getProperty("okhttp.platform", "jdk9")
   val testJavaVersion = System.getProperty("test.java.version", "11").toInt()
 
-  val testRuntimeOnly by configurations.getting
+  val testRuntimeOnly: Configuration by configurations.getting
   dependencies {
     testRuntimeOnly(Dependencies.junit5JupiterEngine)
     testRuntimeOnly(Dependencies.junit5VintageEngine)
@@ -236,6 +236,6 @@ subprojects {
   }
 }
 
-tasks.withType<Wrapper> {
+tasks.wrapper {
   distributionType = Wrapper.DistributionType.ALL
 }
diff --git a/mockwebserver-deprecated/build.gradle.kts b/mockwebserver-deprecated/build.gradle.kts
index 4d29e27a61ec..ec71c9fba0d5 100644
--- a/mockwebserver-deprecated/build.gradle.kts
+++ b/mockwebserver-deprecated/build.gradle.kts
@@ -1,7 +1,6 @@
 import com.android.build.gradle.internal.tasks.factory.dependsOn
 import com.vanniktech.maven.publish.JavadocJar
 import com.vanniktech.maven.publish.KotlinJvm
-import com.vanniktech.maven.publish.MavenPublishBaseExtension
 import me.champeau.gradle.japicmp.JapicmpTask
 
 plugins {
@@ -48,6 +47,6 @@ tasks.register<JapicmpTask>("japicmp") {
 }.let(tasks.check::dependsOn)
 
 
-configure<MavenPublishBaseExtension> {
+mavenPublishing {
   configure(KotlinJvm(javadocJar = JavadocJar.Dokka("dokkaGfm")))
 }
diff --git a/mockwebserver-junit4/build.gradle.kts b/mockwebserver-junit4/build.gradle.kts
index a24a508e6f3a..3e118b0b5e32 100644
--- a/mockwebserver-junit4/build.gradle.kts
+++ b/mockwebserver-junit4/build.gradle.kts
@@ -1,6 +1,5 @@
 import com.vanniktech.maven.publish.JavadocJar
 import com.vanniktech.maven.publish.KotlinJvm
-import com.vanniktech.maven.publish.MavenPublishBaseExtension
 
 plugins {
   kotlin("jvm")
@@ -21,6 +20,6 @@ dependencies {
   testImplementation(Dependencies.assertj)
 }
 
-configure<MavenPublishBaseExtension> {
+mavenPublishing {
   configure(KotlinJvm(javadocJar = JavadocJar.Dokka("dokkaGfm")))
 }
diff --git a/mockwebserver-junit5/build.gradle.kts b/mockwebserver-junit5/build.gradle.kts
index 90765a83a053..c8f270251818 100644
--- a/mockwebserver-junit5/build.gradle.kts
+++ b/mockwebserver-junit5/build.gradle.kts
@@ -1,6 +1,5 @@
 import com.vanniktech.maven.publish.JavadocJar
 import com.vanniktech.maven.publish.KotlinJvm
-import com.vanniktech.maven.publish.MavenPublishBaseExtension
 
 plugins {
   kotlin("jvm")
@@ -30,6 +29,6 @@ dependencies {
   testImplementation(Dependencies.kotlinJunit5)
 }
 
-configure<MavenPublishBaseExtension> {
+mavenPublishing {
   configure(KotlinJvm(javadocJar = JavadocJar.Dokka("dokkaGfm")))
 }
diff --git a/mockwebserver/build.gradle.kts b/mockwebserver/build.gradle.kts
index 345ae40b83c9..1283431a62ac 100644
--- a/mockwebserver/build.gradle.kts
+++ b/mockwebserver/build.gradle.kts
@@ -1,6 +1,5 @@
 import com.vanniktech.maven.publish.JavadocJar
 import com.vanniktech.maven.publish.KotlinJvm
-import com.vanniktech.maven.publish.MavenPublishBaseExtension
 
 plugins {
   kotlin("jvm")
@@ -24,6 +23,6 @@ dependencies {
   testImplementation(Dependencies.assertj)
 }
 
-configure<MavenPublishBaseExtension> {
+mavenPublishing {
   configure(KotlinJvm(javadocJar = JavadocJar.Dokka("dokkaGfm")))
 }
diff --git a/okcurl/build.gradle.kts b/okcurl/build.gradle.kts
index dfbb40d91d69..358e40c2ff8a 100644
--- a/okcurl/build.gradle.kts
+++ b/okcurl/build.gradle.kts
@@ -1,7 +1,6 @@
 import com.android.build.gradle.internal.tasks.factory.dependsOn
 import com.vanniktech.maven.publish.JavadocJar
 import com.vanniktech.maven.publish.KotlinJvm
-import com.vanniktech.maven.publish.MavenPublishBaseExtension
 import java.nio.charset.StandardCharsets
 import org.apache.tools.ant.taskdefs.condition.Os
 
@@ -62,7 +61,7 @@ graal {
   }
 }
 
-configure<MavenPublishBaseExtension> {
+mavenPublishing {
   configure(KotlinJvm(javadocJar = JavadocJar.Dokka("dokkaGfm")))
 }
 
@@ -73,5 +72,5 @@ tasks.register<Copy>("copyResourcesTemplates") {
   filteringCharset = StandardCharsets.UTF_8.toString()
 }.let {
   tasks.processResources.dependsOn(it)
-  tasks.named("javaSourcesJar").dependsOn(it)
+  tasks["javaSourcesJar"].dependsOn(it)
 }
diff --git a/okhttp-bom/build.gradle.kts b/okhttp-bom/build.gradle.kts
index 99d0f26b08eb..4d5b9aad7b28 100644
--- a/okhttp-bom/build.gradle.kts
+++ b/okhttp-bom/build.gradle.kts
@@ -13,8 +13,8 @@ dependencies {
   }
 }
 
-extensions.configure<PublishingExtension> {
-  publications.create("maven", MavenPublication::class) {
-    from(project.components.getByName("javaPlatform"))
+publishing {
+  publications.create<MavenPublication>("maven") {
+    from(project.components["javaPlatform"])
   }
 }
diff --git a/okhttp-brotli/build.gradle.kts b/okhttp-brotli/build.gradle.kts
index d1a7446e7cbd..ffe576b65907 100644
--- a/okhttp-brotli/build.gradle.kts
+++ b/okhttp-brotli/build.gradle.kts
@@ -1,6 +1,5 @@
 import com.vanniktech.maven.publish.JavadocJar
 import com.vanniktech.maven.publish.KotlinJvm
-import com.vanniktech.maven.publish.MavenPublishBaseExtension
 
 plugins {
   kotlin("jvm")
@@ -25,6 +24,6 @@ dependencies {
   testImplementation(Dependencies.assertj)
 }
 
-configure<MavenPublishBaseExtension> {
+mavenPublishing {
   configure(KotlinJvm(javadocJar = JavadocJar.Dokka("dokkaGfm")))
 }
diff --git a/okhttp-dnsoverhttps/build.gradle.kts b/okhttp-dnsoverhttps/build.gradle.kts
index 7ec05e71400c..9df0b47fd9e5 100644
--- a/okhttp-dnsoverhttps/build.gradle.kts
+++ b/okhttp-dnsoverhttps/build.gradle.kts
@@ -1,6 +1,5 @@
 import com.vanniktech.maven.publish.JavadocJar
 import com.vanniktech.maven.publish.KotlinJvm
-import com.vanniktech.maven.publish.MavenPublishBaseExtension
 
 plugins {
   kotlin("jvm")
@@ -27,6 +26,6 @@ dependencies {
   testImplementation(Dependencies.assertj)
 }
 
-configure<MavenPublishBaseExtension> {
+mavenPublishing {
   configure(KotlinJvm(javadocJar = JavadocJar.Dokka("dokkaGfm")))
 }
diff --git a/okhttp-logging-interceptor/build.gradle.kts b/okhttp-logging-interceptor/build.gradle.kts
index 024153a8d109..598ef37f46e8 100644
--- a/okhttp-logging-interceptor/build.gradle.kts
+++ b/okhttp-logging-interceptor/build.gradle.kts
@@ -1,7 +1,6 @@
 import com.android.build.gradle.internal.tasks.factory.dependsOn
 import com.vanniktech.maven.publish.JavadocJar
 import com.vanniktech.maven.publish.KotlinJvm
-import com.vanniktech.maven.publish.MavenPublishBaseExtension
 import me.champeau.gradle.japicmp.JapicmpTask
 
 plugins {
@@ -41,6 +40,6 @@ tasks.register<JapicmpTask>("japicmp") {
   isIncludeSynthetic = true
 }.let(tasks.check::dependsOn)
 
-configure<MavenPublishBaseExtension> {
+mavenPublishing {
   configure(KotlinJvm(javadocJar = JavadocJar.Dokka("dokkaGfm")))
 }
diff --git a/okhttp-sse/build.gradle.kts b/okhttp-sse/build.gradle.kts
index 65059cc6b7aa..11dac97482c1 100644
--- a/okhttp-sse/build.gradle.kts
+++ b/okhttp-sse/build.gradle.kts
@@ -1,7 +1,6 @@
 import com.android.build.gradle.internal.tasks.factory.dependsOn
 import com.vanniktech.maven.publish.JavadocJar
 import com.vanniktech.maven.publish.KotlinJvm
-import com.vanniktech.maven.publish.MavenPublishBaseExtension
 import me.champeau.gradle.japicmp.JapicmpTask
 
 plugins {
@@ -43,6 +42,6 @@ tasks.register<JapicmpTask>("japicmp") {
   )
 }.let(tasks.check::dependsOn)
 
-configure<MavenPublishBaseExtension> {
+mavenPublishing {
   configure(KotlinJvm(javadocJar = JavadocJar.Dokka("dokkaGfm")))
 }
diff --git a/okhttp-tls/build.gradle.kts b/okhttp-tls/build.gradle.kts
index aef64e9d4df6..4f07ea6f39a3 100644
--- a/okhttp-tls/build.gradle.kts
+++ b/okhttp-tls/build.gradle.kts
@@ -1,7 +1,6 @@
 import com.android.build.gradle.internal.tasks.factory.dependsOn
 import com.vanniktech.maven.publish.JavadocJar
 import com.vanniktech.maven.publish.KotlinJvm
-import com.vanniktech.maven.publish.MavenPublishBaseExtension
 import me.champeau.gradle.japicmp.JapicmpTask
 
 plugins {
@@ -49,6 +48,6 @@ tasks.register<JapicmpTask>("japicmp") {
   )
 }.let(tasks.check::dependsOn)
 
-configure<MavenPublishBaseExtension> {
+mavenPublishing {
   configure(KotlinJvm(javadocJar = JavadocJar.Dokka("dokkaGfm")))
 }
diff --git a/okhttp-urlconnection/build.gradle.kts b/okhttp-urlconnection/build.gradle.kts
index 3a9defc07932..ba25df568532 100644
--- a/okhttp-urlconnection/build.gradle.kts
+++ b/okhttp-urlconnection/build.gradle.kts
@@ -1,7 +1,6 @@
 import com.android.build.gradle.internal.tasks.factory.dependsOn
 import com.vanniktech.maven.publish.JavadocJar
 import com.vanniktech.maven.publish.KotlinJvm
-import com.vanniktech.maven.publish.MavenPublishBaseExtension
 import me.champeau.gradle.japicmp.JapicmpTask
 
 plugins {
@@ -44,6 +43,6 @@ tasks.register<JapicmpTask>("japicmp") {
 }.let(tasks.check::dependsOn)
 
 
-configure<MavenPublishBaseExtension> {
+mavenPublishing {
   configure(KotlinJvm(javadocJar = JavadocJar.Dokka("dokkaGfm")))
 }
diff --git a/okhttp/build.gradle.kts b/okhttp/build.gradle.kts
index c2cf2b69a793..c68131890181 100644
--- a/okhttp/build.gradle.kts
+++ b/okhttp/build.gradle.kts
@@ -1,7 +1,6 @@
 import com.android.build.gradle.internal.tasks.factory.dependsOn
 import com.vanniktech.maven.publish.JavadocJar
 import com.vanniktech.maven.publish.KotlinJvm
-import com.vanniktech.maven.publish.MavenPublishBaseExtension
 import java.nio.charset.StandardCharsets
 import me.champeau.gradle.japicmp.JapicmpTask
 
@@ -61,12 +60,10 @@ normalization {
 }
 
 // Expose OSGi jars to the test environment.
-configurations {
-  create("osgiTestDeploy")
-}
+val osgiTestDeploy: Configuration by configurations.creating
 
 tasks.register<Copy>("copyOsgiTestDeployment") {
-  from(configurations["osgiTestDeploy"])
+  from(osgiTestDeploy)
   into("$buildDir/resources/test/okhttp3/osgi/deployments")
 }.let(tasks.test::dependsOn)
 
@@ -173,7 +170,7 @@ tasks.register<JapicmpTask>("japicmp") {
   )
 }.let(tasks.check::dependsOn)
 
-configure<MavenPublishBaseExtension> {
+mavenPublishing {
   configure(KotlinJvm(javadocJar = JavadocJar.Dokka("dokkaGfm")))
 }
 
@@ -184,6 +181,6 @@ tasks.register<Copy>("copyJavaTemplates") {
   filteringCharset = StandardCharsets.UTF_8.toString()
 }.let {
   tasks.compileKotlin.dependsOn(it)
-  tasks.named("javaSourcesJar").dependsOn(it)
+  tasks["javaSourcesJar"].dependsOn(it)
 }