diff --git a/sc/shared/src/test/scala/sigma/LanguageSpecificationV6.scala b/sc/shared/src/test/scala/sigma/LanguageSpecificationV6.scala
index 02f427743..56a06f00e 100644
--- a/sc/shared/src/test/scala/sigma/LanguageSpecificationV6.scala
+++ b/sc/shared/src/test/scala/sigma/LanguageSpecificationV6.scala
@@ -22,7 +22,6 @@ import sigmastate.utils.Extensions.ByteOpsForSigma
 import sigmastate.utils.Helpers
 
 import java.math.BigInteger
-import scala.collection.immutable.ArraySeq
 import scala.util.{Failure, Success}
 
 /** This suite tests all operations for v6.0 version of the language.
@@ -1540,7 +1539,7 @@ class LanguageSpecificationV6 extends LanguageSpecificationBase { suite =>
                 MethodCall.typed[Value[SCollection[SByte.type]]](
                   ValUse(1, SGroupElement),
                   SGroupElementMethods.getMethodByName("getEncoded"),
-                  ArraySeq(),
+                  IndexedSeq(),
                   Map()
                 )
               ),
diff --git a/sc/shared/src/test/scala/sigmastate/utxo/BasicOpsSpecification.scala b/sc/shared/src/test/scala/sigmastate/utxo/BasicOpsSpecification.scala
index b126a278a..6e82a426c 100644
--- a/sc/shared/src/test/scala/sigmastate/utxo/BasicOpsSpecification.scala
+++ b/sc/shared/src/test/scala/sigmastate/utxo/BasicOpsSpecification.scala
@@ -1105,7 +1105,7 @@ class BasicOpsSpecification extends CompilerTestingCommons
   property("deserializeTo - header option") {
     val td = new SigmaTestingData {}
     val h1 = td.TestData.h1.asInstanceOf[CHeader].ergoHeader
-    val headerBytes = Colls.fromArray(Array(1.toByte) ++ h1.bytes.toArray)
+    val headerBytes = Colls.fromArray(Array(1.toByte) ++ h1.bytes)
 
     val customExt = Seq(21.toByte -> ByteArrayConstant(headerBytes))