diff --git a/CHANGELOG.md b/CHANGELOG.md
index 47dd5767..20930f82 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,7 +6,8 @@
 - Added separate `Meta`, `SealedMeta` and `ObservableMutableMeta` builders.
 
 ### Changed
-- Kotlin 1.9
+- Kotlin 1.9.20.
+- Migrated from ktor-io to kotlinx-io.
 - `MutableMeta` builder now returns a simplified version of meta that does not hold listeners. 
 - Ktor-io is replaced with kotlinx-io.
 - More concise names for read/write methods in IO.
diff --git a/build.gradle.kts b/build.gradle.kts
index f15d4a8b..1005929b 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -1,5 +1,4 @@
 import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
-import space.kscience.gradle.isInDevelopment
 import space.kscience.gradle.useApache2Licence
 import space.kscience.gradle.useSPCTeam
 
@@ -31,14 +30,7 @@ ksciencePublish {
         useApache2Licence()
         useSPCTeam()
     }
-    github("dataforge-core", "SciProgCentre")
-    space(
-        if (isInDevelopment) {
-            "https://maven.pkg.jetbrains.space/spc/p/sci/dev"
-        } else {
-            "https://maven.pkg.jetbrains.space/spc/p/sci/maven"
-        }
-    )
+    repository("spc","https://maven.sciprog.center/kscience")
     sonatype()
 }
 
diff --git a/dataforge-io/build.gradle.kts b/dataforge-io/build.gradle.kts
index b4ad8ade..6d3c888c 100644
--- a/dataforge-io/build.gradle.kts
+++ b/dataforge-io/build.gradle.kts
@@ -4,7 +4,7 @@ plugins {
 
 description = "IO module"
 
-val ioVersion = "0.2.0"
+val ioVersion = "0.2.1"
 
 kscience {
     jvm()
@@ -18,7 +18,6 @@ kscience {
         api(projects.dataforgeContext)
         api("org.jetbrains.kotlinx:kotlinx-io-core:$ioVersion")
         api("org.jetbrains.kotlinx:kotlinx-io-bytestring:$ioVersion")
-        //api("io.ktor:ktor-io:${KScienceVersions.ktorVersion}")
     }
 }
 
diff --git a/dataforge-meta/api/dataforge-meta.api b/dataforge-meta/api/dataforge-meta.api
index 94878da2..cfe175ab 100644
--- a/dataforge-meta/api/dataforge-meta.api
+++ b/dataforge-meta/api/dataforge-meta.api
@@ -45,9 +45,9 @@ public final class space/kscience/dataforge/meta/False : space/kscience/dataforg
 
 public final class space/kscience/dataforge/meta/JsonMetaKt {
 	public static final fun getJSON_ARRAY_KEY (Lspace/kscience/dataforge/meta/Meta$Companion;)Ljava/lang/String;
-	public static final fun toJson (Lspace/kscience/dataforge/meta/Meta;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;)Lkotlinx/serialization/json/JsonObject;
+	public static final fun toJson (Lspace/kscience/dataforge/meta/Meta;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;)Lkotlinx/serialization/json/JsonElement;
 	public static final fun toJson (Lspace/kscience/dataforge/meta/Value;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;)Lkotlinx/serialization/json/JsonElement;
-	public static synthetic fun toJson$default (Lspace/kscience/dataforge/meta/Meta;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;ILjava/lang/Object;)Lkotlinx/serialization/json/JsonObject;
+	public static synthetic fun toJson$default (Lspace/kscience/dataforge/meta/Meta;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;ILjava/lang/Object;)Lkotlinx/serialization/json/JsonElement;
 	public static synthetic fun toJson$default (Lspace/kscience/dataforge/meta/Value;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;ILjava/lang/Object;)Lkotlinx/serialization/json/JsonElement;
 	public static final fun toMeta (Lkotlinx/serialization/json/JsonElement;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;)Lspace/kscience/dataforge/meta/SealedMeta;
 	public static final fun toMeta (Lkotlinx/serialization/json/JsonObject;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;)Lspace/kscience/dataforge/meta/SealedMeta;
@@ -639,17 +639,6 @@ public final class space/kscience/dataforge/meta/ValueType : java/lang/Enum {
 	public static fun values ()[Lspace/kscience/dataforge/meta/ValueType;
 }
 
-public final class space/kscience/dataforge/meta/ValueType$$serializer : kotlinx/serialization/internal/GeneratedSerializer {
-	public static final field INSTANCE Lspace/kscience/dataforge/meta/ValueType$$serializer;
-	public fun childSerializers ()[Lkotlinx/serialization/KSerializer;
-	public synthetic fun deserialize (Lkotlinx/serialization/encoding/Decoder;)Ljava/lang/Object;
-	public fun deserialize (Lkotlinx/serialization/encoding/Decoder;)Lspace/kscience/dataforge/meta/ValueType;
-	public fun getDescriptor ()Lkotlinx/serialization/descriptors/SerialDescriptor;
-	public synthetic fun serialize (Lkotlinx/serialization/encoding/Encoder;Ljava/lang/Object;)V
-	public fun serialize (Lkotlinx/serialization/encoding/Encoder;Lspace/kscience/dataforge/meta/ValueType;)V
-	public fun typeParametersSerializers ()[Lkotlinx/serialization/KSerializer;
-}
-
 public final class space/kscience/dataforge/meta/ValueType$Companion {
 	public final fun serializer ()Lkotlinx/serialization/KSerializer;
 }
diff --git a/gradle.properties b/gradle.properties
index d26973e8..18f24486 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -6,5 +6,5 @@ kotlin.mpp.stability.nowarn=true
 kotlin.incremental.js.ir=true
 kotlin.native.ignoreDisabledTargets=true
 
-toolsVersion=0.14.9-kotlin-1.9.0
-kotlin.experimental.tryK2=true
\ No newline at end of file
+toolsVersion=0.15.0-kotlin-1.9.20-RC
+#kotlin.experimental.tryK2=true
\ No newline at end of file
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 84a0b92f..db9a6b82 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.2.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.3-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists