diff --git a/build.gradle.kts b/build.gradle.kts
index ac454902..c3f71631 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -1,6 +1,5 @@
-
 plugins {
-    val toolsVersion = "0.5.0"
+    val toolsVersion = "0.5.1"
     id("scientifik.mpp") version toolsVersion apply false
     id("scientifik.jvm") version toolsVersion apply false
     id("scientifik.publish") version toolsVersion apply false
@@ -11,6 +10,7 @@ val dataforgeVersion by extra("0.1.8")
 
 val bintrayRepo by extra("dataforge")
 val githubProject by extra("dataforge-core")
+val spaceRepo by extra("https://maven.jetbrains.space/mipt-npm/p/df/maven")
 
 allprojects {
     group = "hep.dataforge"
diff --git a/dataforge-io/dataforge-io-yaml/src/main/kotlin/hep/dataforge/io/yaml/FrontMatterEnvelopeFormat.kt b/dataforge-io/dataforge-io-yaml/src/main/kotlin/hep/dataforge/io/yaml/FrontMatterEnvelopeFormat.kt
index 0fffdb7e..b6f4cb50 100644
--- a/dataforge-io/dataforge-io-yaml/src/main/kotlin/hep/dataforge/io/yaml/FrontMatterEnvelopeFormat.kt
+++ b/dataforge-io/dataforge-io-yaml/src/main/kotlin/hep/dataforge/io/yaml/FrontMatterEnvelopeFormat.kt
@@ -18,7 +18,7 @@ class FrontMatterEnvelopeFormat(
 ) : EnvelopeFormat {
 
     override fun Input.readPartial(): PartialEnvelope {
-        var line: String = ""
+        var line = ""
         var offset = 0u
         do {
             line = readUtf8Line() //?: error("Input does not contain front matter separator")
@@ -45,7 +45,7 @@ class FrontMatterEnvelopeFormat(
     }
 
     override fun Input.readObject(): Envelope {
-        var line: String = ""
+        var line = ""
         do {
             line = readUtf8Line() //?: error("Input does not contain front matter separator")
         } while (!line.startsWith(SEPARATOR))