diff --git a/build.gradle.kts b/build.gradle.kts
index e5c4fc39b..6f0478fc2 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -1,14 +1,10 @@
 buildscript {
-    extra["kotlinVersion"] = "1.3.20-eap-100"
-    extra["ioVersion"] = "0.1.2"
-    extra["coroutinesVersion"] = "1.1.0"
-
-    val kotlinVersion: String by extra
-    val ioVersion: String by extra
-    val coroutinesVersion: String by extra
+    val kotlinVersion: String by rootProject.extra("1.3.20")
+    val ioVersion: String by rootProject.extra("0.1.2")
+    val coroutinesVersion: String by rootProject.extra("1.1.1")
 
     repositories {
-        maven("https://dl.bintray.com/kotlin/kotlin-eap")
+        //maven("https://dl.bintray.com/kotlin/kotlin-eap")
         jcenter()
     }
 
@@ -28,7 +24,7 @@ allprojects {
     apply(plugin = "com.jfrog.artifactory")
 
     group = "scientifik"
-    version = "0.0.3-dev-3"
+    version = "0.0.3-dev-4"
 
     repositories {
         maven("https://dl.bintray.com/kotlin/kotlin-eap")
diff --git a/kmath-core/build.gradle b/kmath-core/build.gradle
deleted file mode 100644
index b1a6cccb5..000000000
--- a/kmath-core/build.gradle
+++ /dev/null
@@ -1,50 +0,0 @@
-plugins {
-    id "org.jetbrains.kotlin.multiplatform"
-}
-
-kotlin {
-    jvm {
-        compilations["main"].kotlinOptions.jvmTarget = "1.8"
-        compilations["test"].kotlinOptions.jvmTarget = "1.8"
-    }
-    js()
-
-    sourceSets {
-        commonMain {
-            dependencies {
-                api 'org.jetbrains.kotlin:kotlin-stdlib-common'
-            }
-        }
-        commonTest {
-            dependencies {
-                implementation 'org.jetbrains.kotlin:kotlin-test-common'
-                implementation 'org.jetbrains.kotlin:kotlin-test-annotations-common'
-            }
-        }
-        jvmMain {
-            dependencies {
-                api 'org.jetbrains.kotlin:kotlin-stdlib-jdk8'
-            }
-        }
-        jvmTest {
-            dependencies {
-                implementation 'org.jetbrains.kotlin:kotlin-test'
-                implementation 'org.jetbrains.kotlin:kotlin-test-junit'
-            }
-        }
-        jsMain {
-            dependencies {
-                api 'org.jetbrains.kotlin:kotlin-stdlib-js'
-            }
-        }
-        jsTest {
-            dependencies {
-                implementation 'org.jetbrains.kotlin:kotlin-test-js'
-            }
-        }
-//        mingwMain {
-//        }
-//        mingwTest {
-//        }
-    }
-}
diff --git a/kmath-core/build.gradle.kts b/kmath-core/build.gradle.kts
new file mode 100644
index 000000000..2e753f624
--- /dev/null
+++ b/kmath-core/build.gradle.kts
@@ -0,0 +1,55 @@
+plugins {
+    kotlin("multiplatform")
+}
+
+
+kotlin {
+    jvm {
+        compilations.all {
+            kotlinOptions {
+                jvmTarget = "1.8"
+                freeCompilerArgs += "-progressive"
+            }
+        }
+    }
+    js()
+
+    sourceSets {
+        val commonMain by getting {
+            dependencies {
+                api(kotlin("stdlib"))
+            }
+        }
+        val commonTest by getting {
+            dependencies {
+                implementation(kotlin("test-common"))
+                implementation(kotlin("test-annotations-common"))
+            }
+        }
+        val jvmMain by getting {
+            dependencies {
+                api(kotlin("stdlib-jdk8"))
+            }
+        }
+        val jvmTest by getting {
+            dependencies {
+                implementation(kotlin("test"))
+                implementation(kotlin("test-junit"))
+            }
+        }
+        val jsMain by getting {
+            dependencies {
+                api(kotlin("stdlib-js"))
+            }
+        }
+        val jsTest by getting {
+            dependencies {
+                implementation(kotlin("test-js"))
+            }
+        }
+//        mingwMain {
+//        }
+//        mingwTest {
+//        }
+    }
+}
\ No newline at end of file
diff --git a/kmath-core/src/commonMain/kotlin/scientifik/kmath/linear/Matrix.kt b/kmath-core/src/commonMain/kotlin/scientifik/kmath/linear/Matrix.kt
index 5b4f3f12d..abe44e81a 100644
--- a/kmath-core/src/commonMain/kotlin/scientifik/kmath/linear/Matrix.kt
+++ b/kmath-core/src/commonMain/kotlin/scientifik/kmath/linear/Matrix.kt
@@ -167,7 +167,7 @@ interface Matrix<T : Any> : NDStructure<T> {
         /**
          * Build a square matrix from given elements.
          */
-        fun <T : Any> build(vararg elements: T): Matrix<T> {
+        fun <T : Any> square(vararg elements: T): Matrix<T> {
             val size: Int = sqrt(elements.size.toDouble()).toInt()
             if (size * size != elements.size) error("The number of elements ${elements.size} is not a full square")
             val buffer = elements.asBuffer()
diff --git a/kmath-core/src/commonTest/kotlin/scientifik/kmath/linear/RealLUSolverTest.kt b/kmath-core/src/commonTest/kotlin/scientifik/kmath/linear/RealLUSolverTest.kt
index ea104355c..bfa720369 100644
--- a/kmath-core/src/commonTest/kotlin/scientifik/kmath/linear/RealLUSolverTest.kt
+++ b/kmath-core/src/commonTest/kotlin/scientifik/kmath/linear/RealLUSolverTest.kt
@@ -13,7 +13,7 @@ class RealLUSolverTest {
 
     @Test
     fun testInvert() {
-        val matrix = Matrix.build(
+        val matrix = Matrix.square(
             3.0, 1.0,
             1.0, 3.0
         )
@@ -31,7 +31,7 @@ class RealLUSolverTest {
 
         val inverted = LUSolver.real.inverse(decomposed)
 
-        val expected = Matrix.build(
+        val expected = Matrix.square(
             0.375, -0.125,
             -0.125, 0.375
         )
diff --git a/kmath-koma/build.gradle.kts b/kmath-koma/build.gradle.kts
index 20ad02fbe..0e527e263 100644
--- a/kmath-koma/build.gradle.kts
+++ b/kmath-koma/build.gradle.kts
@@ -1,5 +1,5 @@
 plugins {
-    id("kotlin-multiplatform")
+    kotlin("multiplatform")
 }
 
 repositories {
diff --git a/settings.gradle.kts b/settings.gradle.kts
index ca738647e..cee985432 100644
--- a/settings.gradle.kts
+++ b/settings.gradle.kts
@@ -2,7 +2,7 @@ pluginManagement {
     repositories {
         mavenCentral()
         maven("https://plugins.gradle.org/m2/")
-        maven ("https://dl.bintray.com/kotlin/kotlin-eap")
+        //maven ("https://dl.bintray.com/kotlin/kotlin-eap")
     }
 }