diff --git a/CHANGELOG.md b/CHANGELOG.md
index 14c2e747916..977e9eaf695 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,14 @@
 # Changelog
 
+## 0.4.24
+
+* `Versions`:
+    * `Kotlin`: `1.4.21` -> `1.4.30`
+    * `Klock`: `2.0.4` -> `2.0.6`
+* `Coroutines`:
+    * New class `DoWithFirstBuilder`
+    * Several new extensions like `firstOf`/`first`/`invokeOnFirstOf`
+
 ## 0.4.23
 
 * `Versions`:
diff --git a/coroutines/src/commonMain/kotlin/dev/inmo/micro_utils/coroutines/DoWithFirst.kt b/coroutines/src/commonMain/kotlin/dev/inmo/micro_utils/coroutines/DoWithFirst.kt
index 8bc71da51cb..94891715b83 100644
--- a/coroutines/src/commonMain/kotlin/dev/inmo/micro_utils/coroutines/DoWithFirst.kt
+++ b/coroutines/src/commonMain/kotlin/dev/inmo/micro_utils/coroutines/DoWithFirst.kt
@@ -9,6 +9,19 @@ class DeferredAction<T, O>(
     suspend operator fun invoke() = callback(deferred.await())
 }
 
+class DoWithFirstBuilder<T>(
+    private val scope: CoroutineScope
+) {
+    private val deferreds = mutableListOf<Deferred<T>>()
+    operator fun plus(block: suspend CoroutineScope.() -> T) {
+        deferreds.add(scope.async(start = CoroutineStart.LAZY, block = block))
+    }
+    inline fun add(noinline block: suspend CoroutineScope.() -> T) = plus(block)
+    inline fun include(noinline block: suspend CoroutineScope.() -> T) = plus(block)
+
+    fun build() = deferreds.toList()
+}
+
 fun <T, O> Deferred<T>.buildAction(callback: suspend (T) -> O) = DeferredAction(this, callback)
 
 suspend fun <O> Iterable<DeferredAction<*, O>>.invokeFirstOf(
@@ -32,9 +45,41 @@ suspend fun <T, O> Iterable<Deferred<T>>.invokeOnFirst(
     callback: suspend (T) -> O
 ): O = map { it.buildAction(callback) }.invokeFirstOf(scope, cancelOnResult)
 
+suspend fun <T, O> CoroutineScope.invokeOnFirstOf(
+    cancelOnResult: Boolean = true,
+    block: DoWithFirstBuilder<T>.() -> Unit,
+    callback: suspend (T) -> O
+) = firstOf(
+    DoWithFirstBuilder<T>(this).apply(block).build(),
+    cancelOnResult
+).let { callback(it) }
+
 suspend fun <T, O> invokeOnFirst(
     scope: CoroutineScope,
     vararg variants: Deferred<T>,
     cancelOnResult: Boolean = true,
     callback: suspend (T) -> O
 ): O = variants.toList().invokeOnFirst(scope, cancelOnResult, callback)
+
+suspend fun <T> CoroutineScope.firstOf(
+    variants: Iterable<Deferred<T>>,
+    cancelOnResult: Boolean = true
+) = variants.invokeOnFirst(this, cancelOnResult) { it }
+
+suspend fun <T> CoroutineScope.firstOf(
+    cancelOnResult: Boolean = true,
+    block: DoWithFirstBuilder<T>.() -> Unit
+) = firstOf(
+    DoWithFirstBuilder<T>(this).apply(block).build(),
+    cancelOnResult
+)
+
+suspend fun <T> CoroutineScope.firstOf(
+    vararg variants: Deferred<T>,
+    cancelOnResult: Boolean = true
+) = firstOf(variants.toList(), cancelOnResult)
+
+suspend fun <T> List<Deferred<T>>.first(
+    scope: CoroutineScope,
+    cancelOnResult: Boolean = true
+) = scope.firstOf(this, cancelOnResult)
diff --git a/gradle.properties b/gradle.properties
index e74082177ec..cf79ad930cc 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -6,14 +6,14 @@ kotlin.incremental.js=true
 android.useAndroidX=true
 android.enableJetifier=true
 
-kotlin_version=1.4.21
+kotlin_version=1.4.30
 kotlin_coroutines_version=1.4.2
 kotlin_serialisation_core_version=1.0.1
 kotlin_exposed_version=0.29.1
 
 ktor_version=1.5.1
 
-klockVersion=2.0.4
+klockVersion=2.0.6
 
 github_release_plugin_version=2.2.12
 
@@ -44,5 +44,5 @@ dokka_version=1.4.20
 # Project data
 
 group=dev.inmo
-version=0.4.23
-android_code_version=27
+version=0.4.24
+android_code_version=28
diff --git a/pubconf.kpsb b/pubconf.kpsb
index 3efd784fc97..3e8437fc386 100644
--- a/pubconf.kpsb
+++ b/pubconf.kpsb
@@ -1 +1 @@
-{"bintrayConfig":{"repo":"MicroUtils","packageName":"${project.name}","packageVcs":"https://github.com/InsanusMokrassar/MicroUtils","autoPublish":true,"overridePublish":true},"licenses":[{"id":"Apache-2.0","title":"Apache Software License 2.0","url":"https://git.inmo.dev/InsanusMokrassar/MicroUtils_mirror/src/master/LICENSE"}],"mavenConfig":{"name":"${project.name}","description":"","url":"https://git.inmo.dev/InsanusMokrassar/MicroUtils_mirror","vcsUrl":"ssh://git@git.inmo.dev:8322/InsanusMokrassar/MicroUtils_mirror.git","developers":[{"id":"InsanusMokrassar","name":"Aleksei Ovsiannikov","eMail":"ovsyannikov.alexey95@gmail.com"},{"id":"000Sanya","name":"Syrov Aleksandr","eMail":"000sanya.000sanya@gmail.com"}]}}
\ No newline at end of file
+{"bintrayConfig":{"repo":"MicroUtils","packageName":"${project.name}","packageVcs":"https://github.com/InsanusMokrassar/MicroUtils","autoPublish":true,"overridePublish":true},"licenses":[{"id":"Apache-2.0","title":"Apache Software License 2.0","url":"https://git.inmo.dev/InsanusMokrassar/MicroUtils_mirror/src/master/LICENSE"}],"mavenConfig":{"name":"${project.name}","description":"","url":"https://git.inmo.dev/InsanusMokrassar/MicroUtils_mirror","vcsUrl":"ssh://git@git.inmo.dev:8322/InsanusMokrassar/MicroUtils_mirror.git","includeGpgSigning":true,"developers":[{"id":"InsanusMokrassar","name":"Aleksei Ovsiannikov","eMail":"ovsyannikov.alexey95@gmail.com"},{"id":"000Sanya","name":"Syrov Aleksandr","eMail":"000sanya.000sanya@gmail.com"}]}}
\ No newline at end of file
diff --git a/publish.gradle b/publish.gradle
index 778028dc545..0d6fbea7927 100644
--- a/publish.gradle
+++ b/publish.gradle
@@ -1,24 +1,9 @@
 apply plugin: 'maven-publish'
+apply plugin: 'signing'
 
 task javadocsJar(type: Jar) {
     classifier = 'javadoc'
 }
-task sourceJar (type : Jar) {
-    classifier = 'sources'
-}
-
-afterEvaluate {
-    project.publishing.publications.all {
-        // rename artifacts
-        groupId "${project.group}"
-        if (it.name.contains('kotlinMultiplatform')) {
-            artifactId = "${project.name}"
-            artifact sourceJar
-        } else {
-            artifactId = "${project.name}-$name"
-        }
-    }
-}
 
 publishing {
     publications.all {
@@ -73,4 +58,9 @@ publishing {
         }
         
     }
-}
\ No newline at end of file
+}
+
+signing {
+    useGpgCmd()
+    publishing.publications.forEach { sign it }
+}