diff --git a/build.gradle.kts b/build.gradle.kts
index 783c9ca56..c77ad38b5 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -4,7 +4,7 @@ plugins {
     id("ru.mipt.npm.project")
 }
 
-internal val kmathVersion: String by extra("0.2.0-dev-7")
+internal val kmathVersion: String by extra("0.2.0")
 
 allprojects {
     repositories {
diff --git a/examples/build.gradle.kts b/examples/build.gradle.kts
index 5439d46dc..a1ffb32a3 100644
--- a/examples/build.gradle.kts
+++ b/examples/build.gradle.kts
@@ -69,6 +69,14 @@ benchmark {
     targets.register("benchmarks")
     // This one matches sourceSet name above
 
+    configurations.register("buffer") {
+        warmups = 1 // number of warmup iterations
+        iterations = 3 // number of iterations
+        iterationTime = 500 // time in seconds per iteration
+        iterationTimeUnit = "ms" // time unity for iterationTime, default is seconds
+        include("BufferBenchmark")
+    }
+
     configurations.register("dot") {
         warmups = 1 // number of warmup iterations
         iterations = 3 // number of iterations
diff --git a/examples/src/main/kotlin/space/kscience/kmath/structures/StructureReadBenchmark.kt b/examples/src/main/kotlin/space/kscience/kmath/structures/StructureReadBenchmark.kt
index cfb3bdf7f..7f6d73394 100644
--- a/examples/src/main/kotlin/space/kscience/kmath/structures/StructureReadBenchmark.kt
+++ b/examples/src/main/kotlin/space/kscience/kmath/structures/StructureReadBenchmark.kt
@@ -4,6 +4,7 @@ import space.kscience.kmath.nd.DefaultStrides
 import space.kscience.kmath.nd.NDBuffer
 import kotlin.system.measureTimeMillis
 
+@Suppress("ASSIGNED_BUT_NEVER_ACCESSED_VARIABLE")
 fun main() {
     val n = 6000
     val array = DoubleArray(n * n) { 1.0 }
diff --git a/examples/src/main/kotlin/space/kscience/kmath/structures/StructureWriteBenchmark.kt b/examples/src/main/kotlin/space/kscience/kmath/structures/StructureWriteBenchmark.kt
index c0d97f9ab..13d6f00e4 100644
--- a/examples/src/main/kotlin/space/kscience/kmath/structures/StructureWriteBenchmark.kt
+++ b/examples/src/main/kotlin/space/kscience/kmath/structures/StructureWriteBenchmark.kt
@@ -4,6 +4,7 @@ import space.kscience.kmath.nd.NDStructure
 import space.kscience.kmath.nd.mapToBuffer
 import kotlin.system.measureTimeMillis
 
+@Suppress("UNUSED_VARIABLE")
 fun main() {
     val n = 6000
     val structure = NDStructure.build(intArrayOf(n, n), Buffer.Companion::auto) { 1.0 }
diff --git a/kmath-complex/src/commonMain/kotlin/space/kscience/kmath/complex/Complex.kt b/kmath-complex/src/commonMain/kotlin/space/kscience/kmath/complex/Complex.kt
index 6d2c04c39..deadfda5b 100644
--- a/kmath-complex/src/commonMain/kotlin/space/kscience/kmath/complex/Complex.kt
+++ b/kmath-complex/src/commonMain/kotlin/space/kscience/kmath/complex/Complex.kt
@@ -3,6 +3,7 @@ package space.kscience.kmath.complex
 import space.kscience.kmath.memory.MemoryReader
 import space.kscience.kmath.memory.MemorySpec
 import space.kscience.kmath.memory.MemoryWriter
+import space.kscience.kmath.misc.UnstableKMathAPI
 import space.kscience.kmath.operations.ExtendedField
 import space.kscience.kmath.operations.FieldElement
 import space.kscience.kmath.operations.Norm
@@ -45,6 +46,7 @@ private val PI_DIV_2 = Complex(PI / 2, 0)
 /**
  * A field of [Complex].
  */
+@OptIn(UnstableKMathAPI::class)
 public object ComplexField : ExtendedField<Complex>, Norm<Complex, Complex>, RingWithNumbers<Complex> {
     public override val zero: Complex = 0.0.toComplex()
     public override val one: Complex = 1.0.toComplex()
@@ -166,6 +168,7 @@ public object ComplexField : ExtendedField<Complex>, Norm<Complex, Complex>, Rin
  * @property re The real part.
  * @property im The imaginary part.
  */
+@OptIn(UnstableKMathAPI::class)
 public data class Complex(val re: Double, val im: Double) : FieldElement<Complex, ComplexField> {
     public constructor(re: Number, im: Number) : this(re.toDouble(), im.toDouble())
     public constructor(re: Number) : this(re.toDouble(), 0.0)
diff --git a/kmath-complex/src/commonMain/kotlin/space/kscience/kmath/complex/Quaternion.kt b/kmath-complex/src/commonMain/kotlin/space/kscience/kmath/complex/Quaternion.kt
index 848ac728f..d72644abe 100644
--- a/kmath-complex/src/commonMain/kotlin/space/kscience/kmath/complex/Quaternion.kt
+++ b/kmath-complex/src/commonMain/kotlin/space/kscience/kmath/complex/Quaternion.kt
@@ -3,6 +3,7 @@ package space.kscience.kmath.complex
 import space.kscience.kmath.memory.MemoryReader
 import space.kscience.kmath.memory.MemorySpec
 import space.kscience.kmath.memory.MemoryWriter
+import space.kscience.kmath.misc.UnstableKMathAPI
 import space.kscience.kmath.operations.*
 import space.kscience.kmath.structures.Buffer
 import space.kscience.kmath.structures.MemoryBuffer
@@ -34,6 +35,7 @@ public val Quaternion.r: Double
 /**
  * A field of [Quaternion].
  */
+@OptIn(UnstableKMathAPI::class)
 public object QuaternionField : Field<Quaternion>, Norm<Quaternion, Quaternion>, PowerOperations<Quaternion>,
     ExponentialOperations<Quaternion>, RingWithNumbers<Quaternion> {
     override val zero: Quaternion = 0.toQuaternion()
diff --git a/kmath-core/src/commonMain/kotlin/space/kscience/kmath/linear/BufferMatrix.kt b/kmath-core/src/commonMain/kotlin/space/kscience/kmath/linear/BufferMatrix.kt
index 63f6f77cd..f8f7f5a05 100644
--- a/kmath-core/src/commonMain/kotlin/space/kscience/kmath/linear/BufferMatrix.kt
+++ b/kmath-core/src/commonMain/kotlin/space/kscience/kmath/linear/BufferMatrix.kt
@@ -91,7 +91,7 @@ public class BufferMatrixContext<T : Any, R : Ring<T>>(
 public class BufferMatrix<T : Any>(
     public override val rowNum: Int,
     public override val colNum: Int,
-    public val buffer: Buffer<out T>,
+    public val buffer: Buffer<T>,
 ) : Matrix<T> {
 
     init {
diff --git a/kmath-core/src/commonMain/kotlin/space/kscience/kmath/structures/RealBuffer.kt b/kmath-core/src/commonMain/kotlin/space/kscience/kmath/structures/RealBuffer.kt
index b06efb3fc..e53ed85c7 100644
--- a/kmath-core/src/commonMain/kotlin/space/kscience/kmath/structures/RealBuffer.kt
+++ b/kmath-core/src/commonMain/kotlin/space/kscience/kmath/structures/RealBuffer.kt
@@ -9,9 +9,9 @@ package space.kscience.kmath.structures
 public inline class RealBuffer(public val array: DoubleArray) : MutableBuffer<Double> {
     override val size: Int get() = array.size
 
-    override inline operator fun get(index: Int): Double = array[index]
+    override operator fun get(index: Int): Double = array[index]
 
-    override inline operator fun set(index: Int, value: Double) {
+    override operator fun set(index: Int, value: Double) {
         array[index] = value
     }
 
diff --git a/kmath-coroutines/src/commonMain/kotlin/space/kscience/kmath/streaming/BufferFlow.kt b/kmath-coroutines/src/commonMain/kotlin/space/kscience/kmath/streaming/BufferFlow.kt
index 262978306..4df22c2ad 100644
--- a/kmath-coroutines/src/commonMain/kotlin/space/kscience/kmath/streaming/BufferFlow.kt
+++ b/kmath-coroutines/src/commonMain/kotlin/space/kscience/kmath/streaming/BufferFlow.kt
@@ -17,7 +17,7 @@ public fun <T> Buffer<T>.asFlow(): Flow<T> = iterator().asFlow()
  * Flat map a [Flow] of [Buffer] into continuous [Flow] of elements
  */
 @FlowPreview
-public fun <T> Flow<Buffer<out T>>.spread(): Flow<T> = flatMapConcat { it.asFlow() }
+public fun <T> Flow<Buffer<T>>.spread(): Flow<T> = flatMapConcat { it.asFlow() }
 
 /**
  * Collect incoming flow into fixed size chunks
diff --git a/kmath-coroutines/src/jvmTest/kotlin/space/kscience/kmath/streaming/RingBufferTest.kt b/kmath-coroutines/src/jvmTest/kotlin/space/kscience/kmath/streaming/RingBufferTest.kt
index 3d037cbf9..4a7109310 100644
--- a/kmath-coroutines/src/jvmTest/kotlin/space/kscience/kmath/streaming/RingBufferTest.kt
+++ b/kmath-coroutines/src/jvmTest/kotlin/space/kscience/kmath/streaming/RingBufferTest.kt
@@ -28,7 +28,7 @@ internal class RingBufferTest {
         val windowed = flow.windowed(10)
 
         runBlocking {
-            val first = windowed.take(1).single()
+            @Suppress("UNUSED_VARIABLE") val first = windowed.take(1).single()
             val res = windowed.take(15).map { it.asSequence().average() }.toList()
             assertEquals(0.0, res[0])
             assertEquals(4.5, res[9])
diff --git a/kmath-for-real/src/commonMain/kotlin/space/kscience/kmath/real/dot.kt b/kmath-for-real/src/commonMain/kotlin/space/kscience/kmath/real/dot.kt
index 68ce917fc..cbfb364c1 100644
--- a/kmath-for-real/src/commonMain/kotlin/space/kscience/kmath/real/dot.kt
+++ b/kmath-for-real/src/commonMain/kotlin/space/kscience/kmath/real/dot.kt
@@ -13,7 +13,7 @@ public infix fun BufferMatrix<Double>.dot(other: BufferMatrix<Double>): BufferMa
     val resultArray = DoubleArray(this.rowNum * other.colNum)
 
     //convert to array to insure there is no memory indirection
-    fun Buffer<out Double>.unsafeArray() = if (this is RealBuffer)
+    fun Buffer<Double>.unsafeArray() = if (this is RealBuffer)
         this.array
     else
         DoubleArray(size) { get(it) }
diff --git a/kmath-histograms/src/commonMain/kotlin/space/kscience/kmath/histogram/RealHistogramSpace.kt b/kmath-histograms/src/commonMain/kotlin/space/kscience/kmath/histogram/RealHistogramSpace.kt
index 89d1a0723..26efdf1fe 100644
--- a/kmath-histograms/src/commonMain/kotlin/space/kscience/kmath/histogram/RealHistogramSpace.kt
+++ b/kmath-histograms/src/commonMain/kotlin/space/kscience/kmath/histogram/RealHistogramSpace.kt
@@ -70,7 +70,7 @@ public class RealHistogramSpace(
         val ndCounter = NDStructure.auto(strides) { Counter.real() }
         val hBuilder = HistogramBuilder<Double> { point, value ->
             val index = getIndex(point)
-            ndCounter[index].add(1.0)
+            ndCounter[index].add(value.toDouble())
         }
         hBuilder.apply(builder)
         val values: NDBuffer<Double> = ndCounter.mapToBuffer { it.value }
diff --git a/settings.gradle.kts b/settings.gradle.kts
index 329bce8f9..c040f6e33 100644
--- a/settings.gradle.kts
+++ b/settings.gradle.kts
@@ -2,13 +2,12 @@ pluginManagement {
     repositories {
         gradlePluginPortal()
         jcenter()
+        maven("https://repo.kotlin.link")
         maven("https://dl.bintray.com/kotlin/kotlin-eap")
-        maven("https://dl.bintray.com/mipt-npm/kscience")
-        maven("https://dl.bintray.com/mipt-npm/dev")
         maven("https://dl.bintray.com/kotlin/kotlinx")
     }
 
-    val toolsVersion = "0.7.6"
+    val toolsVersion = "0.7.7"
     val kotlinVersion = "1.4.30"
 
     plugins {