diff --git a/bbootimg/build.gradle.kts b/bbootimg/build.gradle.kts
index 417e656..d2d7d42 100644
--- a/bbootimg/build.gradle.kts
+++ b/bbootimg/build.gradle.kts
@@ -15,7 +15,7 @@
 import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 
 plugins {
-    kotlin("jvm") version "1.4.31"
+    kotlin("jvm") version "1.5.20-RC"
     application
 }
 
diff --git a/bbootimg/src/main/kotlin/avb/AVBInfo.kt b/bbootimg/src/main/kotlin/avb/AVBInfo.kt
index 08bfdad..d121aab 100644
--- a/bbootimg/src/main/kotlin/avb/AVBInfo.kt
+++ b/bbootimg/src/main/kotlin/avb/AVBInfo.kt
@@ -22,7 +22,6 @@ import avb.blob.Header
 /*
     a wonderfaul base64 encoder/decoder: https://cryptii.com/base64-to-hex
  */
-@OptIn(ExperimentalUnsignedTypes::class)
 class AVBInfo(var header: Header? = null,
               var authBlob: AuthBlob? = null,
               var auxBlob: AuxBlob? = null,
diff --git a/bbootimg/src/main/kotlin/avb/Avb.kt b/bbootimg/src/main/kotlin/avb/Avb.kt
index 3f196b9..487868b 100644
--- a/bbootimg/src/main/kotlin/avb/Avb.kt
+++ b/bbootimg/src/main/kotlin/avb/Avb.kt
@@ -39,7 +39,6 @@ import java.nio.file.Files
 import java.nio.file.Paths
 import java.nio.file.StandardOpenOption
 
-@OptIn(ExperimentalUnsignedTypes::class)
 class Avb {
     private val MAX_VBMETA_SIZE = 64 * 1024
     private val MAX_FOOTER_SIZE = 4096
diff --git a/bbootimg/src/main/kotlin/avb/alg/Algorithms.kt b/bbootimg/src/main/kotlin/avb/alg/Algorithms.kt
index 7fbeac6..0d3e33c 100644
--- a/bbootimg/src/main/kotlin/avb/alg/Algorithms.kt
+++ b/bbootimg/src/main/kotlin/avb/alg/Algorithms.kt
@@ -17,7 +17,6 @@ package avb.alg
 import cfig.io.Struct3
 
 class Algorithms {
-    @OptIn(ExperimentalUnsignedTypes::class)
     companion object {
         private val algMap = mutableMapOf<String, Algorithm>()
         fun get(name: String): Algorithm? {
diff --git a/bbootimg/src/main/kotlin/avb/blob/AuthBlob.kt b/bbootimg/src/main/kotlin/avb/blob/AuthBlob.kt
index a388561..84f3908 100644
--- a/bbootimg/src/main/kotlin/avb/blob/AuthBlob.kt
+++ b/bbootimg/src/main/kotlin/avb/blob/AuthBlob.kt
@@ -25,7 +25,6 @@ import java.nio.file.Paths
 import java.security.MessageDigest
 import java.security.PrivateKey
 
-@OptIn(ExperimentalUnsignedTypes::class)
 data class AuthBlob(
     var offset: Long = 0,
     var size: Long = 0,
diff --git a/bbootimg/src/main/kotlin/avb/blob/AuxBlob.kt b/bbootimg/src/main/kotlin/avb/blob/AuxBlob.kt
index 0001205..4c442e4 100644
--- a/bbootimg/src/main/kotlin/avb/blob/AuxBlob.kt
+++ b/bbootimg/src/main/kotlin/avb/blob/AuxBlob.kt
@@ -25,7 +25,6 @@ import org.slf4j.LoggerFactory
 import java.nio.file.Files
 import java.nio.file.Paths
 
-@OptIn(ExperimentalUnsignedTypes::class)
 @JsonIgnoreProperties("descriptorSize")
 class AuxBlob(
     var pubkey: PubKeyInfo? = null,
diff --git a/bbootimg/src/main/kotlin/avb/blob/Footer.kt b/bbootimg/src/main/kotlin/avb/blob/Footer.kt
index eed3a72..d652464 100644
--- a/bbootimg/src/main/kotlin/avb/blob/Footer.kt
+++ b/bbootimg/src/main/kotlin/avb/blob/Footer.kt
@@ -37,7 +37,6 @@ https://github.com/cfig/Android_boot_image_editor/blob/master/doc/layout.md#32-a
 +---------------------------------------+-------------------------+ --> partition_size
  */
 
-@OptIn(ExperimentalUnsignedTypes::class)
 data class Footer constructor(
         var versionMajor: Int = FOOTER_VERSION_MAJOR,
         var versionMinor: Int = FOOTER_VERSION_MINOR,
diff --git a/bbootimg/src/main/kotlin/avb/blob/Header.kt b/bbootimg/src/main/kotlin/avb/blob/Header.kt
index b3c549c..67c4340 100644
--- a/bbootimg/src/main/kotlin/avb/blob/Header.kt
+++ b/bbootimg/src/main/kotlin/avb/blob/Header.kt
@@ -19,7 +19,6 @@ import cfig.io.Struct3
 import java.io.InputStream
 
 //avbtool::AvbVBMetaHeader
-@OptIn(ExperimentalUnsignedTypes::class)
 data class Header(
         var required_libavb_version_major: Int = Avb.AVB_VERSION_MAJOR,
         var required_libavb_version_minor: Int = 0,
diff --git a/bbootimg/src/main/kotlin/avb/desc/ChainPartitionDescriptor.kt b/bbootimg/src/main/kotlin/avb/desc/ChainPartitionDescriptor.kt
index 8bfe48a..d79c140 100644
--- a/bbootimg/src/main/kotlin/avb/desc/ChainPartitionDescriptor.kt
+++ b/bbootimg/src/main/kotlin/avb/desc/ChainPartitionDescriptor.kt
@@ -22,7 +22,6 @@ import java.io.InputStream
 import java.security.MessageDigest
 import org.slf4j.LoggerFactory
 
-@OptIn(ExperimentalUnsignedTypes::class)
 class ChainPartitionDescriptor(
         var rollback_index_location: Int = 0,
         var partition_name_len: Int = 0,
diff --git a/bbootimg/src/main/kotlin/avb/desc/Descriptor.kt b/bbootimg/src/main/kotlin/avb/desc/Descriptor.kt
index 8751b0d..3521b4d 100644
--- a/bbootimg/src/main/kotlin/avb/desc/Descriptor.kt
+++ b/bbootimg/src/main/kotlin/avb/desc/Descriptor.kt
@@ -14,7 +14,6 @@
 
 package avb.desc
 
-@OptIn(ExperimentalUnsignedTypes::class)
 abstract class Descriptor(var tag: Long, var num_bytes_following: Long, var sequence: Int = 0) {
     abstract fun encode(): ByteArray
 }
diff --git a/bbootimg/src/main/kotlin/avb/desc/HashDescriptor.kt b/bbootimg/src/main/kotlin/avb/desc/HashDescriptor.kt
index 1bc3ca4..1088d80 100644
--- a/bbootimg/src/main/kotlin/avb/desc/HashDescriptor.kt
+++ b/bbootimg/src/main/kotlin/avb/desc/HashDescriptor.kt
@@ -24,7 +24,6 @@ import java.io.FileInputStream
 import java.io.InputStream
 import java.security.MessageDigest
 
-@OptIn(ExperimentalUnsignedTypes::class)
 class HashDescriptor(var flags: Int = 0,
                      var partition_name: String = "",
                      var hash_algorithm: String = "",
diff --git a/bbootimg/src/main/kotlin/avb/desc/HashTreeDescriptor.kt b/bbootimg/src/main/kotlin/avb/desc/HashTreeDescriptor.kt
index c052bab..982fca6 100644
--- a/bbootimg/src/main/kotlin/avb/desc/HashTreeDescriptor.kt
+++ b/bbootimg/src/main/kotlin/avb/desc/HashTreeDescriptor.kt
@@ -23,7 +23,6 @@ import java.io.*
 import java.security.MessageDigest
 import java.util.*
 
-@OptIn(ExperimentalUnsignedTypes::class)
 class HashTreeDescriptor(
     var flags: Int = 0,
     var dm_verity_version: Int = 0,
diff --git a/bbootimg/src/main/kotlin/avb/desc/KernelCmdlineDescriptor.kt b/bbootimg/src/main/kotlin/avb/desc/KernelCmdlineDescriptor.kt
index 738ecf4..ac790cf 100644
--- a/bbootimg/src/main/kotlin/avb/desc/KernelCmdlineDescriptor.kt
+++ b/bbootimg/src/main/kotlin/avb/desc/KernelCmdlineDescriptor.kt
@@ -18,7 +18,6 @@ import cfig.helper.Helper
 import cfig.io.Struct3
 import java.io.InputStream
 
-@OptIn(ExperimentalUnsignedTypes::class)
 class KernelCmdlineDescriptor(
         var flags: Int = 0,
         var cmdlineLength: Int = 0,
diff --git a/bbootimg/src/main/kotlin/avb/desc/PropertyDescriptor.kt b/bbootimg/src/main/kotlin/avb/desc/PropertyDescriptor.kt
index 1686449..05c1d13 100644
--- a/bbootimg/src/main/kotlin/avb/desc/PropertyDescriptor.kt
+++ b/bbootimg/src/main/kotlin/avb/desc/PropertyDescriptor.kt
@@ -18,7 +18,6 @@ import cfig.helper.Helper
 import cfig.io.Struct3
 import java.io.InputStream
 
-@OptIn(ExperimentalUnsignedTypes::class)
 class PropertyDescriptor(
         var key: String = "",
         var value: String = "") : Descriptor(TAG, 0, 0) {
diff --git a/bbootimg/src/main/kotlin/avb/desc/UnknownDescriptor.kt b/bbootimg/src/main/kotlin/avb/desc/UnknownDescriptor.kt
index f066847..eec2fa1 100644
--- a/bbootimg/src/main/kotlin/avb/desc/UnknownDescriptor.kt
+++ b/bbootimg/src/main/kotlin/avb/desc/UnknownDescriptor.kt
@@ -21,7 +21,6 @@ import org.slf4j.LoggerFactory
 import java.io.ByteArrayInputStream
 import java.io.InputStream
 
-@OptIn(ExperimentalUnsignedTypes::class)
 class UnknownDescriptor(var data: ByteArray = byteArrayOf()) : Descriptor(0, 0, 0) {
     @Throws(IllegalArgumentException::class)
     constructor(stream: InputStream, seq: Int = 0) : this() {
diff --git a/bbootimg/src/main/kotlin/bootimg/Common.kt b/bbootimg/src/main/kotlin/bootimg/Common.kt
index 76cfa2b..03a00fb 100644
--- a/bbootimg/src/main/kotlin/bootimg/Common.kt
+++ b/bbootimg/src/main/kotlin/bootimg/Common.kt
@@ -37,7 +37,6 @@ import java.nio.ByteOrder
 import java.security.MessageDigest
 import java.util.regex.Pattern
 
-@OptIn(ExperimentalUnsignedTypes::class)
 class Common {
     data class VeritySignature(
         var type: String = "dm-verity",
diff --git a/bbootimg/src/main/kotlin/bootimg/Signer.kt b/bbootimg/src/main/kotlin/bootimg/Signer.kt
index 86c9505..c94a4b2 100644
--- a/bbootimg/src/main/kotlin/bootimg/Signer.kt
+++ b/bbootimg/src/main/kotlin/bootimg/Signer.kt
@@ -27,7 +27,6 @@ import java.io.File
 import cfig.EnvironmentVerifier
 
 class Signer {
-    @OptIn(ExperimentalUnsignedTypes::class)
     companion object {
         private val log = LoggerFactory.getLogger(Signer::class.java)
 
diff --git a/bbootimg/src/main/kotlin/bootimg/v2/BootHeaderV2.kt b/bbootimg/src/main/kotlin/bootimg/v2/BootHeaderV2.kt
index edc068c..cec7e4c 100644
--- a/bbootimg/src/main/kotlin/bootimg/v2/BootHeaderV2.kt
+++ b/bbootimg/src/main/kotlin/bootimg/v2/BootHeaderV2.kt
@@ -21,7 +21,6 @@ import org.slf4j.LoggerFactory
 import java.io.InputStream
 import kotlin.math.pow
 
-@OptIn(ExperimentalUnsignedTypes::class)
 open class BootHeaderV2(
         var kernelLength: Int = 0,
         var kernelOffset: Long = 0L, //UInt
diff --git a/bbootimg/src/main/kotlin/bootimg/v2/BootV2.kt b/bbootimg/src/main/kotlin/bootimg/v2/BootV2.kt
index ff36e29..f5234f6 100644
--- a/bbootimg/src/main/kotlin/bootimg/v2/BootV2.kt
+++ b/bbootimg/src/main/kotlin/bootimg/v2/BootV2.kt
@@ -32,7 +32,6 @@ import java.io.FileOutputStream
 import java.nio.ByteBuffer
 import java.nio.ByteOrder
 
-@OptIn(ExperimentalUnsignedTypes::class)
 data class BootV2(
     var info: MiscInfo = MiscInfo(),
     var kernel: CommArgs = CommArgs(),
diff --git a/bbootimg/src/main/kotlin/bootimg/v3/BootHeaderV3.kt b/bbootimg/src/main/kotlin/bootimg/v3/BootHeaderV3.kt
index 058352c..a8929e5 100644
--- a/bbootimg/src/main/kotlin/bootimg/v3/BootHeaderV3.kt
+++ b/bbootimg/src/main/kotlin/bootimg/v3/BootHeaderV3.kt
@@ -19,7 +19,6 @@ import cfig.io.Struct3
 import org.slf4j.LoggerFactory
 import java.io.InputStream
 
-@OptIn(ExperimentalUnsignedTypes::class)
 class BootHeaderV3(
     var kernelSize: Int = 0,
     var ramdiskSize: Int = 0,
diff --git a/bbootimg/src/main/kotlin/bootimg/v3/BootV3.kt b/bbootimg/src/main/kotlin/bootimg/v3/BootV3.kt
index 7e47feb..af6bdcb 100644
--- a/bbootimg/src/main/kotlin/bootimg/v3/BootV3.kt
+++ b/bbootimg/src/main/kotlin/bootimg/v3/BootV3.kt
@@ -33,7 +33,6 @@ import java.nio.ByteBuffer
 import java.nio.ByteOrder
 import cfig.bootimg.Common as C
 
-@OptIn(ExperimentalUnsignedTypes::class)
 data class BootV3(
     var info: MiscInfo = MiscInfo(),
     var kernel: CommArgs = CommArgs(),
diff --git a/bbootimg/src/main/kotlin/bootimg/v3/VendorBoot.kt b/bbootimg/src/main/kotlin/bootimg/v3/VendorBoot.kt
index 94ea75b..9bafb8d 100644
--- a/bbootimg/src/main/kotlin/bootimg/v3/VendorBoot.kt
+++ b/bbootimg/src/main/kotlin/bootimg/v3/VendorBoot.kt
@@ -34,7 +34,6 @@ import cfig.EnvironmentVerifier
 import cfig.io.Struct3
 import java.io.InputStream
 
-@OptIn(ExperimentalUnsignedTypes::class)
 data class VendorBoot(
     var info: MiscInfo = MiscInfo(),
     var ramdisk: CommArgs = CommArgs(),
diff --git a/bbootimg/src/main/kotlin/bootimg/v3/VendorBootHeader.kt b/bbootimg/src/main/kotlin/bootimg/v3/VendorBootHeader.kt
index 4312369..09dc619 100644
--- a/bbootimg/src/main/kotlin/bootimg/v3/VendorBootHeader.kt
+++ b/bbootimg/src/main/kotlin/bootimg/v3/VendorBootHeader.kt
@@ -18,7 +18,6 @@ import cfig.io.Struct3
 import org.slf4j.LoggerFactory
 import java.io.InputStream
 
-@OptIn(ExperimentalUnsignedTypes::class)
 class VendorBootHeader(
     var headerVersion: Int = 0,
     var pageSize: Int = 0,
diff --git a/bbootimg/src/main/kotlin/bootloader_message/BootloaderMsg.kt b/bbootimg/src/main/kotlin/bootloader_message/BootloaderMsg.kt
index 2f62cc3..c7ab1a2 100644
--- a/bbootimg/src/main/kotlin/bootloader_message/BootloaderMsg.kt
+++ b/bbootimg/src/main/kotlin/bootloader_message/BootloaderMsg.kt
@@ -21,7 +21,6 @@ import java.io.FileInputStream
 import java.io.FileOutputStream
 import java.lang.IllegalStateException
 
-@OptIn(ExperimentalUnsignedTypes::class)
 data class BootloaderMsg(//offset 0, size 2k
         var command: String = "",
         var status: String = "",
diff --git a/bbootimg/src/main/kotlin/bootloader_message/BootloaderMsgAB.kt b/bbootimg/src/main/kotlin/bootloader_message/BootloaderMsgAB.kt
index df5c427..db01ae4 100644
--- a/bbootimg/src/main/kotlin/bootloader_message/BootloaderMsgAB.kt
+++ b/bbootimg/src/main/kotlin/bootloader_message/BootloaderMsgAB.kt
@@ -18,7 +18,6 @@ import cfig.io.Struct3
 import org.slf4j.LoggerFactory
 import java.io.FileInputStream
 
-@OptIn(ExperimentalUnsignedTypes::class)
 class BootloaderMsgAB( //offset 2k, size 2k
         var slotSuffix: String = "",
         var updateChannel: String = "",
diff --git a/bbootimg/src/main/kotlin/bootloader_message/VirtualABMsg.kt b/bbootimg/src/main/kotlin/bootloader_message/VirtualABMsg.kt
index 21d1bd8..538de35 100644
--- a/bbootimg/src/main/kotlin/bootloader_message/VirtualABMsg.kt
+++ b/bbootimg/src/main/kotlin/bootloader_message/VirtualABMsg.kt
@@ -18,7 +18,6 @@ import cfig.io.Struct3
 import org.slf4j.LoggerFactory
 import java.io.FileInputStream
 
-@OptIn(ExperimentalUnsignedTypes::class)
 data class VirtualABMsg(
         var version: Int = 0,
         var magic: ByteArray = byteArrayOf(),
diff --git a/bbootimg/src/main/kotlin/init/Reboot.kt b/bbootimg/src/main/kotlin/init/Reboot.kt
index bbed6fb..51b44ba 100644
--- a/bbootimg/src/main/kotlin/init/Reboot.kt
+++ b/bbootimg/src/main/kotlin/init/Reboot.kt
@@ -26,7 +26,6 @@ class Reboot {
         ANDROID_RB_THERMOFF
     }
 
-    @OptIn(ExperimentalUnsignedTypes::class)
     companion object {
         private val log = LoggerFactory.getLogger(Reboot::class.java)
         const val dynamicPartitionKey = "ro.boot.dynamic_partitions"
diff --git a/bbootimg/src/main/kotlin/packable/BootImgParser.kt b/bbootimg/src/main/kotlin/packable/BootImgParser.kt
index 9d62f85..89c654b 100644
--- a/bbootimg/src/main/kotlin/packable/BootImgParser.kt
+++ b/bbootimg/src/main/kotlin/packable/BootImgParser.kt
@@ -26,7 +26,6 @@ import org.slf4j.LoggerFactory
 import java.io.File
 import java.io.FileInputStream
 
-@OptIn(ExperimentalUnsignedTypes::class)
 class BootImgParser() : IPackable {
     override val loopNo: Int
         get() = 0
diff --git a/bbootimg/src/main/kotlin/packable/DtboParser.kt b/bbootimg/src/main/kotlin/packable/DtboParser.kt
index 8480375..3dc3bba 100644
--- a/bbootimg/src/main/kotlin/packable/DtboParser.kt
+++ b/bbootimg/src/main/kotlin/packable/DtboParser.kt
@@ -27,7 +27,6 @@ import java.io.File
 import java.io.FileInputStream
 import java.util.*
 
-@OptIn(ExperimentalUnsignedTypes::class)
 class DtboParser(val workDir: File) : IPackable {
     override val loopNo: Int
         get() = 0
diff --git a/bbootimg/src/main/kotlin/packable/IPackable.kt b/bbootimg/src/main/kotlin/packable/IPackable.kt
index 4c57ff3..912e269 100644
--- a/bbootimg/src/main/kotlin/packable/IPackable.kt
+++ b/bbootimg/src/main/kotlin/packable/IPackable.kt
@@ -22,7 +22,6 @@ import org.slf4j.Logger
 import org.slf4j.LoggerFactory
 import java.io.File
 
-@OptIn(ExperimentalUnsignedTypes::class)
 interface IPackable {
     val loopNo: Int
     fun capabilities(): List<String> {
diff --git a/bbootimg/src/main/kotlin/packable/PackableLauncher.kt b/bbootimg/src/main/kotlin/packable/PackableLauncher.kt
index 9cbcc80..74f2b75 100644
--- a/bbootimg/src/main/kotlin/packable/PackableLauncher.kt
+++ b/bbootimg/src/main/kotlin/packable/PackableLauncher.kt
@@ -25,7 +25,6 @@ import kotlin.system.exitProcess
 
 class PackableLauncher
 
-@OptIn(ExperimentalUnsignedTypes::class)
 fun main(args: Array<String>) {
     val log = LoggerFactory.getLogger(PackableLauncher::class.java)
     val packablePool = mutableMapOf<List<String>, KClass<IPackable>>()
diff --git a/bbootimg/src/main/kotlin/packable/VBMetaParser.kt b/bbootimg/src/main/kotlin/packable/VBMetaParser.kt
index c2d7864..358af67 100644
--- a/bbootimg/src/main/kotlin/packable/VBMetaParser.kt
+++ b/bbootimg/src/main/kotlin/packable/VBMetaParser.kt
@@ -18,7 +18,6 @@ import cfig.Avb
 import cfig.helper.Helper
 import java.io.File
 
-@OptIn(ExperimentalUnsignedTypes::class)
 class VBMetaParser: IPackable {
     override val loopNo: Int
         get() = 1
diff --git a/bbootimg/src/main/kotlin/sparse_util/SparseImgParser.kt b/bbootimg/src/main/kotlin/sparse_util/SparseImgParser.kt
index b11e3d4..df16de6 100644
--- a/bbootimg/src/main/kotlin/sparse_util/SparseImgParser.kt
+++ b/bbootimg/src/main/kotlin/sparse_util/SparseImgParser.kt
@@ -24,7 +24,6 @@ import com.fasterxml.jackson.databind.ObjectMapper
 import avb.blob.Footer
 import cfig.Avb
 
-@OptIn(ExperimentalUnsignedTypes::class)
 class SparseImgParser : IPackable {
     override val loopNo: Int
         get() = 0
diff --git a/bbootimg/src/test/kotlin/AvbTest.kt b/bbootimg/src/test/kotlin/AvbTest.kt
index b97c7c4..da8bb44 100644
--- a/bbootimg/src/test/kotlin/AvbTest.kt
+++ b/bbootimg/src/test/kotlin/AvbTest.kt
@@ -21,7 +21,6 @@ import org.junit.Assert.*
 import org.slf4j.LoggerFactory
 import java.io.ByteArrayInputStream
 
-@OptIn(ExperimentalUnsignedTypes::class)
 class AvbTest {
     private val log = LoggerFactory.getLogger(AvbTest::class.java)
 
diff --git a/bbootimg/src/test/kotlin/KeyUtilTest.kt b/bbootimg/src/test/kotlin/KeyUtilTest.kt
index 5e513ee..817b436 100644
--- a/bbootimg/src/test/kotlin/KeyUtilTest.kt
+++ b/bbootimg/src/test/kotlin/KeyUtilTest.kt
@@ -31,7 +31,6 @@ import java.security.spec.PKCS8EncodedKeySpec
 import java.security.spec.X509EncodedKeySpec
 import javax.crypto.Cipher
 
-@OptIn(ExperimentalUnsignedTypes::class)
 class KeyUtilTest {
     @Test
     fun parseKeys() {
diff --git a/bbootimg/src/test/kotlin/avb/BlobTest.kt b/bbootimg/src/test/kotlin/avb/BlobTest.kt
index 3343f08..ae5f85b 100644
--- a/bbootimg/src/test/kotlin/avb/BlobTest.kt
+++ b/bbootimg/src/test/kotlin/avb/BlobTest.kt
@@ -24,7 +24,6 @@ import org.junit.Assert.assertEquals
 import org.junit.Test
 import java.io.ByteArrayInputStream
 
-@OptIn(ExperimentalUnsignedTypes::class)
 class BlobTest {
     @Test
     fun testEncodedKey2048() {
diff --git a/bbootimg/src/test/kotlin/avb/FooterTest.kt b/bbootimg/src/test/kotlin/avb/FooterTest.kt
index d417ec4..0329dfb 100644
--- a/bbootimg/src/test/kotlin/avb/FooterTest.kt
+++ b/bbootimg/src/test/kotlin/avb/FooterTest.kt
@@ -20,7 +20,6 @@ import org.junit.Assert.assertEquals
 import org.junit.Test
 import java.io.ByteArrayInputStream
 
-@OptIn(ExperimentalUnsignedTypes::class)
 class FooterTest {
     @Test
     fun readAVBfooter() {
diff --git a/bbootimg/src/test/kotlin/avb/HeaderTest.kt b/bbootimg/src/test/kotlin/avb/HeaderTest.kt
index 7cd0e03..42bd04f 100644
--- a/bbootimg/src/test/kotlin/avb/HeaderTest.kt
+++ b/bbootimg/src/test/kotlin/avb/HeaderTest.kt
@@ -19,7 +19,6 @@ import org.apache.commons.codec.binary.Hex
 import org.junit.Test
 import java.io.ByteArrayInputStream
 
-@OptIn(ExperimentalUnsignedTypes::class)
 class HeaderTest {
 
     @Test
diff --git a/bbootimg/src/test/kotlin/avb/alg/AlgorithmsTest.kt b/bbootimg/src/test/kotlin/avb/alg/AlgorithmsTest.kt
index 68c6797..fad3c8a 100644
--- a/bbootimg/src/test/kotlin/avb/alg/AlgorithmsTest.kt
+++ b/bbootimg/src/test/kotlin/avb/alg/AlgorithmsTest.kt
@@ -18,7 +18,6 @@ import cfig.helper.Helper
 import org.junit.Assert
 import org.junit.Test
 
-@OptIn(ExperimentalUnsignedTypes::class)
 class AlgorithmsTest {
     @Test
     fun test1() {
diff --git a/bbootimg/src/test/kotlin/avb/desc/HashDescriptorTest.kt b/bbootimg/src/test/kotlin/avb/desc/HashDescriptorTest.kt
index db1a497..0db136c 100644
--- a/bbootimg/src/test/kotlin/avb/desc/HashDescriptorTest.kt
+++ b/bbootimg/src/test/kotlin/avb/desc/HashDescriptorTest.kt
@@ -20,7 +20,6 @@ import org.junit.Test
 import org.slf4j.LoggerFactory
 import java.io.ByteArrayInputStream
 
-@OptIn(ExperimentalUnsignedTypes::class)
 class HashDescriptorTest {
     private val log = LoggerFactory.getLogger(HashDescriptorTest::class.java)
 
diff --git a/bbootimg/src/test/kotlin/avb/desc/HashTreeDescriptorTest.kt b/bbootimg/src/test/kotlin/avb/desc/HashTreeDescriptorTest.kt
index 026062f..8d2f521 100644
--- a/bbootimg/src/test/kotlin/avb/desc/HashTreeDescriptorTest.kt
+++ b/bbootimg/src/test/kotlin/avb/desc/HashTreeDescriptorTest.kt
@@ -22,7 +22,6 @@ import org.junit.Test
 import java.io.ByteArrayInputStream
 import java.security.MessageDigest
 
-@OptIn(ExperimentalUnsignedTypes::class)
 class HashTreeDescriptorTest {
 
     @Test
diff --git a/bbootimg/src/test/kotlin/avb/desc/KernelCmdlineDescriptorTest.kt b/bbootimg/src/test/kotlin/avb/desc/KernelCmdlineDescriptorTest.kt
index 7188d2d..c81e5d9 100644
--- a/bbootimg/src/test/kotlin/avb/desc/KernelCmdlineDescriptorTest.kt
+++ b/bbootimg/src/test/kotlin/avb/desc/KernelCmdlineDescriptorTest.kt
@@ -19,7 +19,6 @@ import org.junit.Assert.assertEquals
 import org.junit.Test
 import java.io.ByteArrayInputStream
 
-@OptIn(ExperimentalUnsignedTypes::class)
 class KernelCmdlineDescriptorTest {
     @Test
     fun encode() {
diff --git a/bbootimg/src/test/kotlin/avb/desc/UnknownDescriptorTest.kt b/bbootimg/src/test/kotlin/avb/desc/UnknownDescriptorTest.kt
index 287cf9a..19d50b8 100644
--- a/bbootimg/src/test/kotlin/avb/desc/UnknownDescriptorTest.kt
+++ b/bbootimg/src/test/kotlin/avb/desc/UnknownDescriptorTest.kt
@@ -20,7 +20,6 @@ import org.junit.Test
 import org.slf4j.LoggerFactory
 import java.io.ByteArrayInputStream
 
-@OptIn(ExperimentalUnsignedTypes::class)
 class UnknownDescriptorTest {
     private val log = LoggerFactory.getLogger(UnknownDescriptorTest::class.java)
 
diff --git a/bbootimg/src/test/kotlin/bootloader_message/BootloaderMsgTest.kt b/bbootimg/src/test/kotlin/bootloader_message/BootloaderMsgTest.kt
index cd7969e..c313559 100644
--- a/bbootimg/src/test/kotlin/bootloader_message/BootloaderMsgTest.kt
+++ b/bbootimg/src/test/kotlin/bootloader_message/BootloaderMsgTest.kt
@@ -21,7 +21,6 @@ import org.junit.Test
 import org.slf4j.LoggerFactory
 import java.io.File
 
-@OptIn(ExperimentalUnsignedTypes::class)
 class BootloaderMsgTest {
     private val log = LoggerFactory.getLogger(BootloaderMsgTest::class.java)
 
diff --git a/bbootimg/src/test/kotlin/init/RebootTest.kt b/bbootimg/src/test/kotlin/init/RebootTest.kt
index 463cd0d..ee56430 100644
--- a/bbootimg/src/test/kotlin/init/RebootTest.kt
+++ b/bbootimg/src/test/kotlin/init/RebootTest.kt
@@ -23,7 +23,6 @@ import cfig.init.Reboot
 import cfig.bootimg.Common.Companion.deleleIfExists
 import org.slf4j.LoggerFactory
 
-@OptIn(ExperimentalUnsignedTypes::class)
 class RebootTest {
     private val log = LoggerFactory.getLogger(RebootTest::class.java)
 
diff --git a/helper/build.gradle.kts b/helper/build.gradle.kts
index ca0992f..bf793cc 100644
--- a/helper/build.gradle.kts
+++ b/helper/build.gradle.kts
@@ -15,7 +15,7 @@
 import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 
 plugins {
-    id("org.jetbrains.kotlin.jvm") version "1.4.31"
+    id("org.jetbrains.kotlin.jvm") version "1.5.20-RC"
     `java-library`
 }
 
diff --git a/helper/src/main/kotlin/cfig/helper/Helper.kt b/helper/src/main/kotlin/cfig/helper/Helper.kt
index a8398d6..d65f195 100644
--- a/helper/src/main/kotlin/cfig/helper/Helper.kt
+++ b/helper/src/main/kotlin/cfig/helper/Helper.kt
@@ -30,7 +30,6 @@ import kotlin.math.pow
 import java.text.StringCharacterIterator
 import java.text.CharacterIterator
 
-@OptIn(ExperimentalUnsignedTypes::class)
 class Helper {
     data class Slice(
         var srcFile: String,
diff --git a/helper/src/main/kotlin/cfig/helper/KeyHelper.kt b/helper/src/main/kotlin/cfig/helper/KeyHelper.kt
index 97a1a6c..6e05b33 100644
--- a/helper/src/main/kotlin/cfig/helper/KeyHelper.kt
+++ b/helper/src/main/kotlin/cfig/helper/KeyHelper.kt
@@ -35,7 +35,6 @@ import java.util.*
 https://docs.oracle.com/javase/9/security/java-pki-programmers-guide.htm#JSSEC-GUID-650D0D53-B617-4055-AFD3-AF5C2629CBBF
 https://www.baeldung.com/java-read-pem-file-keys
  */
-@OptIn(ExperimentalUnsignedTypes::class)
 class KeyHelper {
     companion object {
         private val log = LoggerFactory.getLogger(KeyHelper::class.java)
diff --git a/helper/src/main/kotlin/cfig/io/Struct3.kt b/helper/src/main/kotlin/cfig/io/Struct3.kt
index 3cdc008..a8f4add 100644
--- a/helper/src/main/kotlin/cfig/io/Struct3.kt
+++ b/helper/src/main/kotlin/cfig/io/Struct3.kt
@@ -45,7 +45,6 @@ import java.util.*
 import java.util.regex.Pattern
 import kotlin.random.Random
 
-@OptIn(kotlin.ExperimentalUnsignedTypes::class)
 class Struct3 {
     private val log = LoggerFactory.getLogger(Struct3::class.java)
     private val formatString: String
diff --git a/helper/src/test/kotlin/cfig/io/Struct3Test.kt b/helper/src/test/kotlin/cfig/io/Struct3Test.kt
index aa04eec..96c3e9e 100644
--- a/helper/src/test/kotlin/cfig/io/Struct3Test.kt
+++ b/helper/src/test/kotlin/cfig/io/Struct3Test.kt
@@ -19,7 +19,6 @@ import org.junit.Assert
 import org.junit.Test
 import java.io.ByteArrayInputStream
 
-@OptIn(ExperimentalUnsignedTypes::class)
 class Struct3Test {
     private fun getConvertedFormats(inStruct: Struct3): ArrayList<Map<String, Int>> {
         val f = inStruct.javaClass.getDeclaredField("formats")