diff --git a/build.gradle.kts b/build.gradle.kts
index 819da13..8d32850 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -21,7 +21,7 @@ application {
 }
 
 
-val dataforgeVersion by extra("0.6.0-dev-5")
+val dataforgeVersion by extra("0.6.0-dev-6")
 val ktorVersion = KScienceVersions.ktorVersion
 
 dependencies {
@@ -42,6 +42,12 @@ dependencies {
 
 kotlin {
     explicitApi = org.jetbrains.kotlin.gradle.dsl.ExplicitApiMode.Disabled
+    sourceSets.all {
+        languageSettings {
+            languageVersion  = "1.7"
+            apiVersion = "1.7"
+        }
+    }
 
 }
 
diff --git a/src/main/kotlin/ru/mipt/spc/magprog/DataSetPageContext.kt b/src/main/kotlin/ru/mipt/spc/magprog/DataSetPageContext.kt
index afa45a9..0fd159a 100644
--- a/src/main/kotlin/ru/mipt/spc/magprog/DataSetPageContext.kt
+++ b/src/main/kotlin/ru/mipt/spc/magprog/DataSetPageContext.kt
@@ -96,7 +96,7 @@ class DataSetPageContext(
 
     @DFInternal
     override fun <T : Any> resolveAll(type: KType, predicate: (name: Name, meta: Meta) -> Boolean): DataSet<T> =
-        dataSet.filterIsInstance(type, predicate = predicate)
+        dataSet.filterByType(type, predicate = predicate)
 
     override fun resolveHtml(name: Name): HtmlData? = runBlocking {
         resolve<ByteArray>(name)?.takeIf { it.published }?.toHtmlBlock()
@@ -104,7 +104,7 @@ class DataSetPageContext(
 
     override fun resolveAllHtml(filter: (name: Name, meta: Meta) -> Boolean): Map<Name, HtmlData> = runBlocking {
         buildMap {
-            resolveAll<ByteArray>(filter).dataSequence().filter { it.published }.forEach {
+            resolveAll<ByteArray>(filter).traverse().filter { it.published }.forEach {
                 put(it.name, it.toHtmlBlock())
             }
         }
diff --git a/src/main/kotlin/ru/mipt/spc/magprog/SnarkPageContext.kt b/src/main/kotlin/ru/mipt/spc/magprog/SnarkPageContext.kt
index 8c817a1..dbd33ca 100644
--- a/src/main/kotlin/ru/mipt/spc/magprog/SnarkPageContext.kt
+++ b/src/main/kotlin/ru/mipt/spc/magprog/SnarkPageContext.kt
@@ -4,8 +4,8 @@ import space.kscience.dataforge.actions.invoke
 import space.kscience.dataforge.context.Context
 import space.kscience.dataforge.data.Data
 import space.kscience.dataforge.data.DataSet
-import space.kscience.dataforge.data.filterIsInstance
-import space.kscience.dataforge.data.selectOne
+import space.kscience.dataforge.data.filterByType
+import space.kscience.dataforge.data.getByType
 import space.kscience.dataforge.meta.Meta
 import space.kscience.dataforge.misc.DFInternal
 import space.kscience.dataforge.names.Name
@@ -30,14 +30,14 @@ class SnarkPageContext(
     private val parsedData: DataSet<Any> by lazy { snarkPlugin.parseAction(directoryDataTree) }
 
     @DFInternal
-    override fun <T : Any> resolve(type: KType, name: Name): Data<T>? = parsedData.selectOne(type, name)
+    override fun <T : Any> resolve(type: KType, name: Name): Data<T>? = parsedData.getByType(type, name)
 
     @DFInternal
     override fun <T : Any> resolveAll(type: KType, predicate: (name: Name, meta: Meta) -> Boolean): DataSet<T> =
-        parsedData.filterIsInstance(type, predicate)
+        parsedData.filterByType(type, predicate)
 
     override fun resolveHtml(name: Name): HtmlData? = resolve(name)
 
     override fun resolveAllHtml(filter: (name: Name, meta: Meta) -> Boolean): Map<Name, HtmlData> =
-        resolveAll<HtmlFragment>(filter).dataSequence().filter { it.published }.associate { it.name to it.data }
+        resolveAll<HtmlFragment>(filter).traverse().filter { it.published }.associate { it.name to it.data }
 }
\ No newline at end of file