diff --git a/benchmarks/build.gradle.kts b/benchmarks/build.gradle.kts
index 130cc84a3..ea9934a52 100644
--- a/benchmarks/build.gradle.kts
+++ b/benchmarks/build.gradle.kts
@@ -48,7 +48,7 @@ kotlin {
                 implementation(project(":kmath-nd4j"))
                 implementation(project(":kmath-kotlingrad"))
                 implementation(project(":kmath-viktor"))
-                implementation(projects.kmathMultik)
+                implementation(project(":kmath-multik"))
                 implementation("org.nd4j:nd4j-native:1.0.0-M1")
                 //    uncomment if your system supports AVX2
                 //    val os = System.getProperty("os.name")
@@ -134,9 +134,9 @@ afterEvaluate {
 
 kotlin.sourceSets.all {
     with(languageSettings) {
-        useExperimentalAnnotation("kotlin.contracts.ExperimentalContracts")
-        useExperimentalAnnotation("kotlin.ExperimentalUnsignedTypes")
-        useExperimentalAnnotation("space.kscience.kmath.misc.UnstableKMathAPI")
+        optIn("kotlin.contracts.ExperimentalContracts")
+        optIn("kotlin.ExperimentalUnsignedTypes")
+        optIn("space.kscience.kmath.misc.UnstableKMathAPI")
     }
 }
 
diff --git a/build.gradle.kts b/build.gradle.kts
index c2347f7be..919356c0f 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -39,7 +39,7 @@ subprojects {
                     localDirectory.set(kotlinDir)
 
                     remoteUrl.set(
-                        URL("https://github.com/mipt-npm/${rootProject.name}/tree/master/${this@subprojects.name}/$kotlinDirPath")
+                        URL("https://github.com/mipt-npm/kmath/tree/master/${this@subprojects.name}/$kotlinDirPath")
                     )
                 }
 
@@ -64,9 +64,9 @@ subprojects {
 readme.readmeTemplate = file("docs/templates/README-TEMPLATE.md")
 
 ksciencePublish {
-    vcs("https://github.com/mipt-npm/kmath")
-    space(publish = true)
-    sonatype(publish = true)
+    github("kmath", publish = false)
+    space()
+    sonatype()
 }
 
 apiValidation.nonPublicMarkers.add("space.kscience.kmath.misc.UnstableKMathAPI")
diff --git a/buildSrc/build.gradle.kts b/buildSrc/build.gradle.kts
index 36a1ffd9e..072309332 100644
--- a/buildSrc/build.gradle.kts
+++ b/buildSrc/build.gradle.kts
@@ -1,6 +1,6 @@
 plugins {
     `kotlin-dsl`
-    kotlin("plugin.serialization") version "1.4.31"
+    kotlin("plugin.serialization") version "1.5.21"
 }
 
 repositories {
@@ -10,8 +10,8 @@ repositories {
 }
 
 dependencies {
-    api("org.jetbrains.kotlinx:kotlinx-serialization-json:1.1.0")
-    api("ru.mipt.npm:gradle-tools:0.10.2")
+    api("org.jetbrains.kotlinx:kotlinx-serialization-json:1.2.2")
+    api("ru.mipt.npm:gradle-tools:0.10.7")
     api("org.jetbrains.kotlinx:kotlinx-benchmark-plugin:0.3.1")
 }
 
diff --git a/examples/build.gradle.kts b/examples/build.gradle.kts
index 05e562143..990b564e1 100644
--- a/examples/build.gradle.kts
+++ b/examples/build.gradle.kts
@@ -32,7 +32,7 @@ dependencies {
     //jafama
     implementation(project(":kmath-jafama"))
     //multik
-    implementation(projects.kmathMultik)
+    implementation(project(":kmath-multik"))
 
 
     implementation("org.nd4j:nd4j-native:1.0.0-beta7")
@@ -57,9 +57,9 @@ dependencies {
 
 kotlin.sourceSets.all {
     with(languageSettings) {
-        useExperimentalAnnotation("kotlin.contracts.ExperimentalContracts")
-        useExperimentalAnnotation("kotlin.ExperimentalUnsignedTypes")
-        useExperimentalAnnotation("space.kscience.kmath.misc.UnstableKMathAPI")
+        optIn("kotlin.contracts.ExperimentalContracts")
+        optIn("kotlin.ExperimentalUnsignedTypes")
+        optIn("space.kscience.kmath.misc.UnstableKMathAPI")
     }
 }
 
diff --git a/kmath-ast/build.gradle.kts b/kmath-ast/build.gradle.kts
index 331d8c614..15b1d0900 100644
--- a/kmath-ast/build.gradle.kts
+++ b/kmath-ast/build.gradle.kts
@@ -20,7 +20,7 @@ kotlin.js {
 kotlin.sourceSets {
     filter { it.name.contains("test", true) }
         .map(org.jetbrains.kotlin.gradle.plugin.KotlinSourceSet::languageSettings)
-        .forEach { it.useExperimentalAnnotation("space.kscience.kmath.misc.UnstableKMathAPI") }
+        .forEach { it.optIn("space.kscience.kmath.misc.UnstableKMathAPI") }
 
     commonMain {
         dependencies {
diff --git a/kmath-commons/src/main/kotlin/space/kscience/kmath/commons/random/CMRandomGeneratorWrapper.kt b/kmath-commons/src/main/kotlin/space/kscience/kmath/commons/random/CMRandomGeneratorWrapper.kt
index 6aeebb68c..194be6002 100644
--- a/kmath-commons/src/main/kotlin/space/kscience/kmath/commons/random/CMRandomGeneratorWrapper.kt
+++ b/kmath-commons/src/main/kotlin/space/kscience/kmath/commons/random/CMRandomGeneratorWrapper.kt
@@ -38,10 +38,7 @@ public class CMRandomGeneratorWrapper(
 
     override fun nextInt(): Int = generator.nextInt()
     override fun nextInt(n: Int): Int = generator.nextInt(n)
-
-    @PerformancePitfall
     override fun nextGaussian(): Double = runBlocking { GaussianSampler(0.0, 1.0).next(generator) }
-
     override fun nextDouble(): Double = generator.nextDouble()
     override fun nextLong(): Long = generator.nextLong()
 }
diff --git a/kmath-core/build.gradle.kts b/kmath-core/build.gradle.kts
index 143e576f7..490868a0b 100644
--- a/kmath-core/build.gradle.kts
+++ b/kmath-core/build.gradle.kts
@@ -5,21 +5,14 @@ plugins {
 //    id("com.xcporter.metaview") version "0.0.5"
 }
 
-kotlin {
-    jvm {
-        compilations.all {
-            kotlinOptions {
-                freeCompilerArgs =
-                    freeCompilerArgs + "-Xjvm-default=all" + "-Xopt-in=kotlin.RequiresOptIn" + "-Xlambdas=indy"
-            }
-        }
-    }
+kotlin.sourceSets {
+    filter { it.name.contains("test", true) }
+        .map(org.jetbrains.kotlin.gradle.plugin.KotlinSourceSet::languageSettings)
+        .forEach { it.optIn("space.kscience.kmath.misc.PerformancePitfall") }
 
-    sourceSets {
-        commonMain {
-            dependencies {
-                api(project(":kmath-memory"))
-            }
+    commonMain {
+        dependencies {
+            api(project(":kmath-memory"))
         }
     }
 }
diff --git a/kmath-core/src/commonMain/kotlin/space/kscience/kmath/misc/annotations.kt b/kmath-core/src/commonMain/kotlin/space/kscience/kmath/misc/annotations.kt
index 73ecd6492..7c612b6a9 100644
--- a/kmath-core/src/commonMain/kotlin/space/kscience/kmath/misc/annotations.kt
+++ b/kmath-core/src/commonMain/kotlin/space/kscience/kmath/misc/annotations.kt
@@ -12,7 +12,7 @@ package space.kscience.kmath.misc
  * in some way that may break some code.
  */
 @MustBeDocumented
-@Retention(value = AnnotationRetention.SOURCE)
+@Retention(value = AnnotationRetention.BINARY)
 @RequiresOptIn("This API is unstable and could change in future", RequiresOptIn.Level.WARNING)
 public annotation class UnstableKMathAPI
 
@@ -21,10 +21,10 @@ public annotation class UnstableKMathAPI
  * slow-down in some cases. Refer to the documentation and benchmark it to be sure.
  */
 @MustBeDocumented
-@Retention(value = AnnotationRetention.SOURCE)
+@Retention(value = AnnotationRetention.BINARY)
 @RequiresOptIn(
     "Refer to the documentation to use this API in performance-critical code",
-    RequiresOptIn.Level.WARNING
+    RequiresOptIn.Level.WARNING,
 )
 public annotation class PerformancePitfall(
     val message: String = "Potential performance problem"
diff --git a/kmath-core/src/commonMain/kotlin/space/kscience/kmath/operations/BufferAlgebra.kt b/kmath-core/src/commonMain/kotlin/space/kscience/kmath/operations/BufferAlgebra.kt
index 634a115c7..653552044 100644
--- a/kmath-core/src/commonMain/kotlin/space/kscience/kmath/operations/BufferAlgebra.kt
+++ b/kmath-core/src/commonMain/kotlin/space/kscience/kmath/operations/BufferAlgebra.kt
@@ -35,13 +35,11 @@ public interface BufferAlgebra<T, out A : Algebra<T>> : Algebra<Buffer<T>> {
     public fun Buffer<T>.zip(other: Buffer<T>, block: A.(left: T, right: T) -> T): Buffer<T> =
         zipInline(this, other, block)
 
-    @UnstableKMathAPI
     override fun unaryOperationFunction(operation: String): (arg: Buffer<T>) -> Buffer<T> {
         val operationFunction = elementAlgebra.unaryOperationFunction(operation)
         return { arg -> bufferFactory(arg.size) { operationFunction(arg[it]) } }
     }
 
-    @UnstableKMathAPI
     override fun binaryOperationFunction(operation: String): (left: Buffer<T>, right: Buffer<T>) -> Buffer<T> {
         val operationFunction = elementAlgebra.binaryOperationFunction(operation)
         return { left, right ->
@@ -141,11 +139,9 @@ public open class BufferRingOps<T, A: Ring<T>>(
     override fun multiply(left: Buffer<T>, right: Buffer<T>): Buffer<T> = zipInline(left, right) { l, r -> l * r }
     override fun Buffer<T>.unaryMinus(): Buffer<T> = map { -it }
 
-    @UnstableKMathAPI
     override fun unaryOperationFunction(operation: String): (arg: Buffer<T>) -> Buffer<T> =
         super<BufferAlgebra>.unaryOperationFunction(operation)
 
-    @UnstableKMathAPI
     override fun binaryOperationFunction(operation: String): (left: Buffer<T>, right: Buffer<T>) -> Buffer<T> =
         super<BufferAlgebra>.binaryOperationFunction(operation)
 }
@@ -165,7 +161,6 @@ public open class BufferFieldOps<T, A : Field<T>>(
     override fun scale(a: Buffer<T>, value: Double): Buffer<T> = a.map { scale(it, value) }
     override fun Buffer<T>.unaryMinus(): Buffer<T> = map { -it }
 
-    @UnstableKMathAPI
     override fun binaryOperationFunction(operation: String): (left: Buffer<T>, right: Buffer<T>) -> Buffer<T> =
         super<BufferRingOps>.binaryOperationFunction(operation)
 }
diff --git a/kmath-core/src/commonMain/kotlin/space/kscience/kmath/operations/DoubleBufferField.kt b/kmath-core/src/commonMain/kotlin/space/kscience/kmath/operations/DoubleBufferField.kt
index 8ec3c3aea..f2f7326aa 100644
--- a/kmath-core/src/commonMain/kotlin/space/kscience/kmath/operations/DoubleBufferField.kt
+++ b/kmath-core/src/commonMain/kotlin/space/kscience/kmath/operations/DoubleBufferField.kt
@@ -40,7 +40,6 @@ public class DoubleBufferField(public val size: Int) : ExtendedField<Buffer<Doub
         }
     }
 
-    @UnstableKMathAPI
     override fun unaryOperationFunction(operation: String): (arg: Buffer<Double>) -> Buffer<Double> =
         super<ExtendedField>.unaryOperationFunction(operation)
 
diff --git a/kmath-core/src/commonMain/kotlin/space/kscience/kmath/operations/DoubleBufferOps.kt b/kmath-core/src/commonMain/kotlin/space/kscience/kmath/operations/DoubleBufferOps.kt
index a5e1c42e2..0ee591acc 100644
--- a/kmath-core/src/commonMain/kotlin/space/kscience/kmath/operations/DoubleBufferOps.kt
+++ b/kmath-core/src/commonMain/kotlin/space/kscience/kmath/operations/DoubleBufferOps.kt
@@ -26,11 +26,9 @@ public abstract class DoubleBufferOps : BufferAlgebra<Double, DoubleField>, Exte
     override fun Buffer<Double>.map(block: DoubleField.(Double) -> Double): DoubleBuffer =
         mapInline { DoubleField.block(it) }
 
-    @UnstableKMathAPI
     override fun unaryOperationFunction(operation: String): (arg: Buffer<Double>) -> Buffer<Double> =
         super<ExtendedFieldOps>.unaryOperationFunction(operation)
 
-    @UnstableKMathAPI
     override fun binaryOperationFunction(operation: String): (left: Buffer<Double>, right: Buffer<Double>) -> Buffer<Double> =
         super<ExtendedFieldOps>.binaryOperationFunction(operation)
 
diff --git a/kmath-coroutines/build.gradle.kts b/kmath-coroutines/build.gradle.kts
index 317691ae5..aa30c412b 100644
--- a/kmath-coroutines/build.gradle.kts
+++ b/kmath-coroutines/build.gradle.kts
@@ -7,9 +7,9 @@ plugins {
 kotlin.sourceSets {
     all {
         with(languageSettings) {
-            useExperimentalAnnotation("kotlinx.coroutines.InternalCoroutinesApi")
-            useExperimentalAnnotation("kotlinx.coroutines.ExperimentalCoroutinesApi")
-            useExperimentalAnnotation("kotlinx.coroutines.FlowPreview")
+            optIn("kotlinx.coroutines.InternalCoroutinesApi")
+            optIn("kotlinx.coroutines.ExperimentalCoroutinesApi")
+            optIn("kotlinx.coroutines.FlowPreview")
         }
     }
 
diff --git a/kmath-jafama/build.gradle.kts b/kmath-jafama/build.gradle.kts
index 9cf328d0b..925a2bc60 100644
--- a/kmath-jafama/build.gradle.kts
+++ b/kmath-jafama/build.gradle.kts
@@ -23,5 +23,5 @@ readme {
 }
 
 kotlin.sourceSets.all {
-    languageSettings.useExperimentalAnnotation("space.kscience.kmath.misc.UnstableKMathAPI")
+    languageSettings.optIn("space.kscience.kmath.misc.UnstableKMathAPI")
 }
diff --git a/kmath-jupyter/build.gradle.kts b/kmath-jupyter/build.gradle.kts
index 5bd08c485..ca1a5485f 100644
--- a/kmath-jupyter/build.gradle.kts
+++ b/kmath-jupyter/build.gradle.kts
@@ -9,7 +9,7 @@ dependencies {
     api(project(":kmath-for-real"))
 }
 
-kscience{
+kscience {
     useHtml()
 }
 
@@ -18,7 +18,7 @@ readme {
 }
 
 kotlin.sourceSets.all {
-    languageSettings.useExperimentalAnnotation("space.kscience.kmath.misc.UnstableKMathAPI")
+    languageSettings.optIn("space.kscience.kmath.misc.UnstableKMathAPI")
 }
 
 tasks.processJupyterApiResources {
diff --git a/kmath-optimization/build.gradle.kts b/kmath-optimization/build.gradle.kts
index 68b82ad65..b920b9267 100644
--- a/kmath-optimization/build.gradle.kts
+++ b/kmath-optimization/build.gradle.kts
@@ -8,6 +8,10 @@ kscience {
 }
 
 kotlin.sourceSets {
+    all {
+        languageSettings.optIn("space.kscience.kmath.misc.UnstableKMathAPI")
+    }
+
     commonMain {
         dependencies {
             api(project(":kmath-coroutines"))
diff --git a/kmath-tensors/build.gradle.kts b/kmath-tensors/build.gradle.kts
index d084878ea..66316d21d 100644
--- a/kmath-tensors/build.gradle.kts
+++ b/kmath-tensors/build.gradle.kts
@@ -6,9 +6,13 @@ plugins {
 
 kotlin.sourceSets {
     all {
-        languageSettings.useExperimentalAnnotation("space.kscience.kmath.misc.UnstableKMathAPI")
+        languageSettings.optIn("space.kscience.kmath.misc.UnstableKMathAPI")
     }
 
+    filter { it.name.contains("test", true) }
+        .map(org.jetbrains.kotlin.gradle.plugin.KotlinSourceSet::languageSettings)
+        .forEach { it.optIn("space.kscience.kmath.misc.PerformancePitfall") }
+
     commonMain {
         dependencies {
             api(project(":kmath-core"))
diff --git a/kmath-tensors/src/commonMain/kotlin/space/kscience/kmath/tensors/core/DoubleTensorAlgebra.kt b/kmath-tensors/src/commonMain/kotlin/space/kscience/kmath/tensors/core/DoubleTensorAlgebra.kt
index ae1a053af..dc3ec43e9 100644
--- a/kmath-tensors/src/commonMain/kotlin/space/kscience/kmath/tensors/core/DoubleTensorAlgebra.kt
+++ b/kmath-tensors/src/commonMain/kotlin/space/kscience/kmath/tensors/core/DoubleTensorAlgebra.kt
@@ -384,7 +384,6 @@ public open class DoubleTensorAlgebra :
     override fun Tensor<Double>.viewAs(other: StructureND<Double>): DoubleTensor =
         tensor.view(other.shape)
 
-    @PerformancePitfall
     override infix fun StructureND<Double>.dot(other: StructureND<Double>): DoubleTensor {
         if (tensor.shape.size == 1 && other.shape.size == 1) {
             return DoubleTensor(intArrayOf(1), doubleArrayOf(tensor.times(other).tensor.mutableBuffer.array().sum()))
diff --git a/settings.gradle.kts b/settings.gradle.kts
index e73381bf2..343e937e1 100644
--- a/settings.gradle.kts
+++ b/settings.gradle.kts
@@ -5,14 +5,10 @@ pluginManagement {
         gradlePluginPortal()
     }
 
-    val kotlinVersion = "1.6.0-RC"
-    val toolsVersion = "0.10.5"
+    val kotlinVersion = "1.6.0"
 
     plugins {
         id("org.jetbrains.kotlinx.benchmark") version "0.3.1"
-        id("ru.mipt.npm.gradle.project") version toolsVersion
-        id("ru.mipt.npm.gradle.jvm") version toolsVersion
-        id("ru.mipt.npm.gradle.mpp") version toolsVersion
         kotlin("multiplatform") version kotlinVersion
         kotlin("plugin.allopen") version kotlinVersion
     }
@@ -20,9 +16,6 @@ pluginManagement {
 
 rootProject.name = "kmath"
 
-enableFeaturePreview("TYPESAFE_PROJECT_ACCESSORS")
-enableFeaturePreview("VERSION_CATALOGS")
-
 include(
     ":kmath-memory",
     ":kmath-complex",