diff --git a/CHANGELOG.md b/CHANGELOG.md
index 12fa02e..8638d24 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [Unreleased]
 ### Added
 - Disable API validation for snapshots
+- `-Xjvm-default=all` on JVM
 
 ### Changed
 - `publication.platform` changed to `publishing.platform`
diff --git a/build.gradle.kts b/build.gradle.kts
index 59ded7b..f09f6c3 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -13,14 +13,12 @@ version = "0.9.5-dev"
 description = "Build tools for DataForge and kscience projects"
 
 repositories {
+    mavenCentral()
     gradlePluginPortal()
-    jcenter()
     maven("https://repo.kotlin.link")
-    maven("https://kotlin.bintray.com/kotlinx")
-    maven("https://dl.bintray.com/kotlin/kotlin-dev")
 }
 
-val kotlinVersion = "1.5.0-M2"
+val kotlinVersion = "1.5.0-RC"
 
 java {
     targetCompatibility = JavaVersion.VERSION_1_8
diff --git a/src/main/kotlin/ru/mipt/npm/gradle/KScienceCommonPlugin.kt b/src/main/kotlin/ru/mipt/npm/gradle/KScienceCommonPlugin.kt
index d3b1b65..33a9556 100644
--- a/src/main/kotlin/ru/mipt/npm/gradle/KScienceCommonPlugin.kt
+++ b/src/main/kotlin/ru/mipt/npm/gradle/KScienceCommonPlugin.kt
@@ -42,6 +42,7 @@ open class KScienceCommonPlugin : Plugin<Project> {
                 kotlinOptions {
                     useIR = true
                     jvmTarget = KScienceVersions.JVM_TARGET.toString()
+                    freeCompilerArgs = freeCompilerArgs + "-Xjvm-default=all"
                 }
             }
 
@@ -96,6 +97,7 @@ open class KScienceCommonPlugin : Plugin<Project> {
                         kotlinOptions {
                             useIR = true
                             jvmTarget = KScienceVersions.JVM_TARGET.toString()
+                            freeCompilerArgs = freeCompilerArgs + "-Xjvm-default=all"
                         }
                     }
                 }
diff --git a/src/main/kotlin/ru/mipt/npm/gradle/KScienceProjectPlugin.kt b/src/main/kotlin/ru/mipt/npm/gradle/KScienceProjectPlugin.kt
index 87fa030..8d33965 100644
--- a/src/main/kotlin/ru/mipt/npm/gradle/KScienceProjectPlugin.kt
+++ b/src/main/kotlin/ru/mipt/npm/gradle/KScienceProjectPlugin.kt
@@ -137,19 +137,19 @@ open class KScienceProjectPlugin : Plugin<Project> {
                             val name = subproject.name
                             val path = subproject.path.replaceFirst(":", "").replace(":", "/")
                             val ext = subproject.extensions.findByType<KScienceReadmeExtension>()
-                            appendln("<hr/>")
-                            appendln("\n* ### [$name]($path)")
+                            appendLine("<hr/>")
+                            appendLine("\n* ### [$name]($path)")
                             if (ext != null) {
-                                appendln("> ${ext.description}")
-                                appendln(">\n> **Maturity**: ${ext.maturity}")
+                                appendLine("> ${ext.description}")
+                                appendLine(">\n> **Maturity**: ${ext.maturity}")
                                 val featureString = ext.featuresString(itemPrefix = "> - ", pathPrefix = "$path/")
                                 if (featureString.isNotBlank()) {
-                                    appendln(">\n> **Features:**")
-                                    appendln(featureString)
+                                    appendLine(">\n> **Features:**")
+                                    appendLine(featureString)
                                 }
                             }
                         }
-                        appendln("<hr/>")
+                        appendLine("<hr/>")
                     }
 
                     val rootReadmeProperties: Map<String, Any?> =
@@ -168,7 +168,7 @@ open class KScienceProjectPlugin : Plugin<Project> {
             dependsOn(generateReadme)
         }
 
-        val patchChangelog by tasks.getting
+        //val patchChangelog by tasks.getting
 
         val release by tasks.creating {
             group = RELEASE_GROUP
diff --git a/src/main/kotlin/ru/mipt/npm/gradle/KScienceReadmeExtension.kt b/src/main/kotlin/ru/mipt/npm/gradle/KScienceReadmeExtension.kt
index 25b362c..0b79d45 100644
--- a/src/main/kotlin/ru/mipt/npm/gradle/KScienceReadmeExtension.kt
+++ b/src/main/kotlin/ru/mipt/npm/gradle/KScienceReadmeExtension.kt
@@ -80,7 +80,7 @@ class KScienceReadmeExtension(val project: Project) {
      */
     fun featuresString(itemPrefix: String = " - ", pathPrefix: String = "") = buildString {
         features.forEach {
-            appendln("$itemPrefix[${it.name}]($pathPrefix${it.ref ?: "#"}) : ${it.description}")
+            appendLine("$itemPrefix[${it.name}]($pathPrefix${it.ref ?: "#"}) : ${it.description}")
         }
     }
 
diff --git a/src/main/kotlin/ru/mipt/npm/gradle/KScienceVersions.kt b/src/main/kotlin/ru/mipt/npm/gradle/KScienceVersions.kt
index 9fa3180..f868033 100644
--- a/src/main/kotlin/ru/mipt/npm/gradle/KScienceVersions.kt
+++ b/src/main/kotlin/ru/mipt/npm/gradle/KScienceVersions.kt
@@ -6,7 +6,7 @@ import org.gradle.api.JavaVersion
  * Build constants
  */
 object KScienceVersions {
-    const val kotlinVersion = "1.5.0-M2"
+    const val kotlinVersion = "1.5.0-RC"
     const val kotlinxNodeVersion = "0.0.7"
     const val coroutinesVersion = "1.4.3"
     const val serializationVersion = "1.1.0"