diff --git a/Android.bp b/Android.bp
index ba382399..951547cd 100644
--- a/Android.bp
+++ b/Android.bp
@@ -32,6 +32,8 @@ android_app {
         "androidx.lifecycle_lifecycle-livedata-ktx",
         "androidx-constraintlayout_constraintlayout",
         "com.google.android.material_material",
+        "kotlinx-coroutines-android",
+        "kotlinx-coroutines-core",
         // storage backup lib
         "seedvault-lib-storage",
         // koin
diff --git a/app/build.gradle b/app/build.gradle
index d4134c83..d976a9fd 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -38,12 +38,12 @@ android {
         abortOnError true
     }
     compileOptions {
-        targetCompatibility 1.8
-        sourceCompatibility 1.8
+        sourceCompatibility = JavaVersion.VERSION_11
+        targetCompatibility = JavaVersion.VERSION_11
     }
     kotlinOptions {
-        jvmTarget = JavaVersion.VERSION_1_8.toString()
-        languageVersion = "1.4"
+        jvmTarget = JavaVersion.VERSION_11.toString()
+        languageVersion = "1.6"
     }
     testOptions {
         unitTests.all {
@@ -138,10 +138,11 @@ dependencies {
     // anything less than 'implementation' fails tests run with gradlew
     testImplementation rootProject.ext.aosp_libs
     testImplementation 'androidx.test.ext:junit:1.1.3'
-    testImplementation('org.robolectric:robolectric:4.3.1') { // 4.4 has issue with non-idle Looper
+    testImplementation('org.robolectric:robolectric:4.8.1') {
         // https://github.com/robolectric/robolectric/issues/5245
         exclude group: "com.google.auto.service", module: "auto-service"
     }
+    testImplementation 'org.hamcrest:hamcrest:2.2'
     testImplementation "org.junit.jupiter:junit-jupiter-api:$junit5_version"
     testImplementation "org.junit.jupiter:junit-jupiter-params:$junit5_version"
     testImplementation "io.mockk:mockk:$mockk_version"
@@ -159,9 +160,6 @@ apply from: "${rootProject.rootDir}/gradle/ktlint.gradle"
 
 gradle.projectsEvaluated {
     tasks.withType(JavaCompile) {
-        if (JavaVersion.current() >= JavaVersion.VERSION_1_9) {
-            options.compilerArgs.addAll(['--release', '8'])
-        }
         options.compilerArgs.add('-Xbootclasspath/p:app/libs/android.jar:app/libs/libcore.jar')
     }
 }
diff --git a/app/libs/android.jar b/app/libs/android.jar
index 48002e33..5e9d53d4 100644
Binary files a/app/libs/android.jar and b/app/libs/android.jar differ
diff --git a/app/libs/libcore.jar b/app/libs/libcore.jar
index 94d798d2..2c0049b7 100644
Binary files a/app/libs/libcore.jar and b/app/libs/libcore.jar differ
diff --git a/app/src/main/java/com/stevesoltys/seedvault/settings/AppListRetriever.kt b/app/src/main/java/com/stevesoltys/seedvault/settings/AppListRetriever.kt
index cae5c319..29cb923c 100644
--- a/app/src/main/java/com/stevesoltys/seedvault/settings/AppListRetriever.kt
+++ b/app/src/main/java/com/stevesoltys/seedvault/settings/AppListRetriever.kt
@@ -106,7 +106,7 @@ internal class AppListRetriever(
                 time = time,
                 status = status
             )
-        }.sortedBy { it.name.toLowerCase(locale) }
+        }.sortedBy { it.name.lowercase(locale) }
     }
 
     private fun getNotAllowedApps(): List<AppStatus> {
@@ -120,7 +120,7 @@ internal class AppListRetriever(
                 time = 0,
                 status = FAILED_NOT_ALLOWED
             )
-        }.sortedBy { it.name.toLowerCase(locale) }
+        }.sortedBy { it.name.lowercase(locale) }
     }
 
     private fun getIcon(packageName: String): Drawable = when (packageName) {
diff --git a/app/src/test/java/com/stevesoltys/seedvault/restore/install/ApkBackupRestoreTest.kt b/app/src/test/java/com/stevesoltys/seedvault/restore/install/ApkBackupRestoreTest.kt
index 97012e3d..f8805c78 100644
--- a/app/src/test/java/com/stevesoltys/seedvault/restore/install/ApkBackupRestoreTest.kt
+++ b/app/src/test/java/com/stevesoltys/seedvault/restore/install/ApkBackupRestoreTest.kt
@@ -133,14 +133,8 @@ internal class ApkBackupRestoreTest : TransportTest() {
         every { strictContext.cacheDir } returns tmpFile
         every { crypto.getNameForApk(salt, packageName, "") } returns name
         coEvery { storagePlugin.getInputStream(token, name) } returns inputStream
-        every { pm.getPackageArchiveInfo(capture(apkPath), any()) } returns packageInfo
-        every {
-            @Suppress("UNRESOLVED_REFERENCE")
-            pm.loadItemIcon(
-                packageInfo.applicationInfo,
-                packageInfo.applicationInfo
-            )
-        } returns icon
+        every { pm.getPackageArchiveInfo(capture(apkPath), any<Int>()) } returns packageInfo
+        every { applicationInfo.loadIcon(pm) } returns icon
         every { pm.getApplicationLabel(packageInfo.applicationInfo) } returns appName
         every {
             splitCompatChecker.isCompatible(metadata.deviceName, listOf(splitName))
diff --git a/app/src/test/java/com/stevesoltys/seedvault/restore/install/ApkRestoreTest.kt b/app/src/test/java/com/stevesoltys/seedvault/restore/install/ApkRestoreTest.kt
index ad730402..6eb1e969 100644
--- a/app/src/test/java/com/stevesoltys/seedvault/restore/install/ApkRestoreTest.kt
+++ b/app/src/test/java/com/stevesoltys/seedvault/restore/install/ApkRestoreTest.kt
@@ -1,7 +1,6 @@
 package com.stevesoltys.seedvault.restore.install
 
 import android.content.Context
-import android.content.pm.ApplicationInfo
 import android.content.pm.ApplicationInfo.FLAG_INSTALLED
 import android.content.pm.ApplicationInfo.FLAG_SYSTEM
 import android.content.pm.ApplicationInfo.FLAG_UPDATED_SYSTEM_APP
@@ -112,7 +111,7 @@ internal class ApkRestoreTest : TransportTest() {
         every { strictContext.cacheDir } returns File(tmpDir.toString())
         every { crypto.getNameForApk(salt, packageName, "") } returns name
         coEvery { storagePlugin.getInputStream(token, name) } returns apkInputStream
-        every { pm.getPackageArchiveInfo(any(), any()) } returns packageInfo
+        every { pm.getPackageArchiveInfo(any(), any<Int>()) } returns packageInfo
         every { storagePlugin.providerPackageName } returns storageProviderPackageName
 
         apkRestore.restore(backup).collectIndexed { i, value ->
@@ -176,14 +175,8 @@ internal class ApkRestoreTest : TransportTest() {
         coEvery {
             legacyStoragePlugin.getApkInputStream(token, packageName, "")
         } returns apkInputStream
-        every { pm.getPackageArchiveInfo(any(), any()) } returns packageInfo
-        every {
-            @Suppress("UNRESOLVED_REFERENCE")
-            pm.loadItemIcon(
-                packageInfo.applicationInfo,
-                packageInfo.applicationInfo
-            )
-        } returns icon
+        every { pm.getPackageArchiveInfo(any(), any<Int>()) } returns packageInfo
+        every { applicationInfo.loadIcon(pm) } returns icon
         every { pm.getApplicationLabel(packageInfo.applicationInfo) } returns appName
         coEvery {
             apkInstaller.install(match { it.size == 1 }, packageName, installerName, any())
@@ -200,13 +193,11 @@ internal class ApkRestoreTest : TransportTest() {
         runBlocking {
             val packageMetadata = this@ApkRestoreTest.packageMetadata.copy(system = true)
             packageMetadataMap[packageName] = packageMetadata
-            packageInfo.applicationInfo = mockk()
             val installedPackageInfo: PackageInfo = mockk()
             val willFail = Random.nextBoolean()
             val isSystemApp = Random.nextBoolean()
 
             cacheBaseApkAndGetInfo(tmpDir)
-            every { packageInfo.applicationInfo.loadIcon(pm) } returns icon
             every { storagePlugin.providerPackageName } returns storageProviderPackageName
 
             if (willFail) {
@@ -214,7 +205,7 @@ internal class ApkRestoreTest : TransportTest() {
                     pm.getPackageInfo(packageName, 0)
                 } throws PackageManager.NameNotFoundException()
             } else {
-                installedPackageInfo.applicationInfo = ApplicationInfo().apply {
+                installedPackageInfo.applicationInfo = mockk {
                     flags =
                         if (!isSystemApp) FLAG_INSTALLED else FLAG_SYSTEM or FLAG_UPDATED_SYSTEM_APP
                 }
@@ -421,14 +412,8 @@ internal class ApkRestoreTest : TransportTest() {
         every { strictContext.cacheDir } returns File(tmpDir.toString())
         every { crypto.getNameForApk(salt, packageName, "") } returns name
         coEvery { storagePlugin.getInputStream(token, name) } returns apkInputStream
-        every { pm.getPackageArchiveInfo(any(), any()) } returns packageInfo
-        every {
-            @Suppress("UNRESOLVED_REFERENCE")
-            pm.loadItemIcon(
-                packageInfo.applicationInfo,
-                packageInfo.applicationInfo
-            )
-        } returns icon
+        every { pm.getPackageArchiveInfo(any(), any<Int>()) } returns packageInfo
+        every { applicationInfo.loadIcon(pm) } returns icon
         every { pm.getApplicationLabel(packageInfo.applicationInfo) } returns appName
     }
 
diff --git a/app/src/test/java/com/stevesoltys/seedvault/transport/TransportTest.kt b/app/src/test/java/com/stevesoltys/seedvault/transport/TransportTest.kt
index 2f4e0cd2..35e81b28 100644
--- a/app/src/test/java/com/stevesoltys/seedvault/transport/TransportTest.kt
+++ b/app/src/test/java/com/stevesoltys/seedvault/transport/TransportTest.kt
@@ -37,12 +37,13 @@ internal abstract class TransportTest {
 
     protected val sigInfo: SigningInfo = mockk()
     protected val token = Random.nextLong()
+    protected val applicationInfo = mockk<ApplicationInfo> {
+        flags = FLAG_ALLOW_BACKUP or FLAG_INSTALLED
+    }
     protected val packageInfo = PackageInfo().apply {
         packageName = "org.example"
         longVersionCode = Random.nextLong()
-        applicationInfo = ApplicationInfo().apply {
-            flags = FLAG_ALLOW_BACKUP or FLAG_INSTALLED
-        }
+        applicationInfo = this@TransportTest.applicationInfo
         signingInfo = sigInfo
     }
     protected val pmPackageInfo = PackageInfo().apply {
diff --git a/app/src/test/java/com/stevesoltys/seedvault/transport/backup/BackupCoordinatorTest.kt b/app/src/test/java/com/stevesoltys/seedvault/transport/backup/BackupCoordinatorTest.kt
index 9a58f3fb..d5facae7 100644
--- a/app/src/test/java/com/stevesoltys/seedvault/transport/backup/BackupCoordinatorTest.kt
+++ b/app/src/test/java/com/stevesoltys/seedvault/transport/backup/BackupCoordinatorTest.kt
@@ -5,7 +5,6 @@ import android.app.backup.BackupTransport.TRANSPORT_NOT_INITIALIZED
 import android.app.backup.BackupTransport.TRANSPORT_OK
 import android.app.backup.BackupTransport.TRANSPORT_PACKAGE_REJECTED
 import android.app.backup.BackupTransport.TRANSPORT_QUOTA_EXCEEDED
-import android.content.pm.ApplicationInfo
 import android.content.pm.ApplicationInfo.FLAG_STOPPED
 import android.content.pm.PackageInfo
 import android.net.Uri
@@ -399,7 +398,9 @@ internal class BackupCoordinatorTest : BackupTest() {
             PackageInfo().apply {
                 packageName = "org.example.2"
                 // the second package does not get backed up, because it is stopped
-                applicationInfo = ApplicationInfo().apply { flags = FLAG_STOPPED }
+                applicationInfo = mockk {
+                    flags = FLAG_STOPPED
+                }
             }
         )
         val packageMetadata: PackageMetadata = mockk()
diff --git a/build.gradle b/build.gradle
index bb25f307..f35c1cc2 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,11 +1,11 @@
 buildscript {
-    // 1.3.21 Android 10
     // 1.3.61 Android 11
     // 1.4.30 Android 12
+    // 1.6.10 Android 13
     // Check:
-    // https://android.googlesource.com/platform/external/kotlinc/+/refs/tags/android-12.0.0_r2/build.txt
-    ext.aosp_kotlin_version = '1.4.31'  // 1.4.30 breaks Kotlin plugin in Android Studio
-    ext.kotlin_version = '1.4.31'
+    // https://android.googlesource.com/platform/external/kotlinc/+/refs/tags/android-13.0.0_r3/build.txt
+    ext.aosp_kotlin_version = '1.6.10'  // 1.6.10-release-923 in AOSP
+    ext.kotlin_version = '1.6.10'
 
     repositories {
         mavenCentral()
@@ -15,15 +15,15 @@ buildscript {
         //noinspection DifferentKotlinGradleVersion
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
         classpath "com.google.protobuf:protobuf-gradle-plugin:0.8.17"
-        classpath 'com.android.tools.build:gradle:7.0.2'
+        classpath 'com.android.tools.build:gradle:7.2.2'
     }
 }
 
 ext {
-    buildToolsVersion = '31.0.0'
-    compileSdkVersion = 31
+    buildToolsVersion = '33.0.0'
+    compileSdkVersion = 33
     minSdkVersion = 29
-    targetSdkVersion = 31
+    targetSdkVersion = 33
 }
 
 apply from: 'gradle/dependencies.gradle'
diff --git a/contactsbackup/build.gradle b/contactsbackup/build.gradle
index c7999696..71121216 100644
--- a/contactsbackup/build.gradle
+++ b/contactsbackup/build.gradle
@@ -15,12 +15,12 @@ android {
     }
 
     compileOptions {
-        sourceCompatibility = 1.8
-        targetCompatibility = 1.8
+        sourceCompatibility = JavaVersion.VERSION_11
+        targetCompatibility = JavaVersion.VERSION_11
     }
 
     kotlinOptions {
-        jvmTarget = '1.8'
+        jvmTarget = JavaVersion.VERSION_11.toString()
     }
 
     testOptions {
diff --git a/contactsbackup/libs/com.android.vcard.jar b/contactsbackup/libs/com.android.vcard.jar
index f677ef61..8060d849 100644
Binary files a/contactsbackup/libs/com.android.vcard.jar and b/contactsbackup/libs/com.android.vcard.jar differ
diff --git a/gradle/dependencies.gradle b/gradle/dependencies.gradle
index 607af4e0..9a0ecb1b 100644
--- a/gradle/dependencies.gradle
+++ b/gradle/dependencies.gradle
@@ -1,7 +1,7 @@
 ext {
-    // https://android.googlesource.com/platform/prebuilts/sdk/+/refs/tags/android-12.0.0_r2/current/androidx/Android.bp#2943
-    ext.room_version = "2.3.0-beta02"
-    // https://android.googlesource.com/platform/external/protobuf/+/refs/tags/android-12.0.0_r2/java/pom.xml#7
+    // https://android.googlesource.com/platform/prebuilts/sdk/+/refs/tags/android-13.0.0_r3/current/androidx/Android.bp#3901
+    ext.room_version = "2.4.0-alpha05"
+    // https://android.googlesource.com/platform/external/protobuf/+/refs/tags/android-13.0.0_r3/java/pom.xml#7
     ext.protobuf_version = "3.9.1"
     junit4_version = "4.13.2"
     junit5_version = "5.5.2" // careful, upgrading this can change a Cipher's IV size in tests!?
@@ -37,58 +37,58 @@ ext.kotlin_libs = [
     ],
     coroutines: [
         dependencies.create('org.jetbrains.kotlinx:kotlinx-coroutines-core-jvm') {
-            // https://android.googlesource.com/platform/prebuilts/tools/+/refs/tags/android-12.0.0_r2/common/m2/Android.bp#273
-            version { strictly '1.4.2' }
+            // https://android.googlesource.com/platform/external/kotlinx.coroutines/+/refs/tags/android-13.0.0_r3/CHANGES.md
+            version { strictly '1.5.2' }
         },
         dependencies.create('org.jetbrains.kotlinx:kotlinx-coroutines-android') {
-            // https://android.googlesource.com/platform/prebuilts/tools/+/refs/tags/android-12.0.0_r2/common/m2/Android.bp#288
-            version { strictly '1.3.0' }
+            // https://android.googlesource.com/platform/external/kotlinx.coroutines/+/refs/tags/android-13.0.0_r3/CHANGES.md
+            version { strictly '1.5.2' }
         },
     ],
 ]
 
 ext.std_libs = [
     androidx_core: [
-        // https://android.googlesource.com/platform/prebuilts/sdk/+/refs/tags/android-12.0.0_r2/current/androidx/Android.bp#867
+        // https://android.googlesource.com/platform/prebuilts/sdk/+/refs/tags/android-13.0.0_r3/current/androidx/Android.bp#1761
         dependencies.create('androidx.core:core') {
-            version { strictly '1.6.0' } // should be 1.6.0-beta03, but that is not even released, yet
+            version { strictly '1.9.0-alpha03' }
         },
-        // https://android.googlesource.com/platform/prebuilts/sdk/+/refs/tags/android-12.0.0_r2/current/androidx/Android.bp#833
+        // https://android.googlesource.com/platform/prebuilts/sdk/+/refs/tags/android-13.0.0_r3/current/androidx/Android.bp#1727
         dependencies.create('androidx.core:core-ktx') {
-            version { strictly '1.5.0-beta02' }
+            version { strictly '1.9.0-alpha03' }
         },
     ],
-    // https://android.googlesource.com/platform/prebuilts/sdk/+/refs/tags/android-12.0.0_r2/current/androidx/Android.bp#1189
+    // https://android.googlesource.com/platform/prebuilts/sdk/+/refs/tags/android-13.0.0_r3/current/androidx/Android.bp#2159
     androidx_fragment: dependencies.create('androidx.fragment:fragment-ktx') {
-        version { strictly '1.4.0-alpha01' }
+        version { strictly '1.4.0-alpha09' }
     },
-    // https://android.googlesource.com/platform/prebuilts/sdk/+/refs/tags/android-12.0.0_r2/current/androidx/Android.bp#20
+    // https://android.googlesource.com/platform/prebuilts/sdk/+/refs/tags/android-13.0.0_r3/current/androidx/Android.bp#57
     androidx_activity: dependencies.create('androidx.activity:activity-ktx') {
-        version { strictly '1.3.0-alpha03' }
+        version { strictly '1.4.0-alpha02' }
     },
-    // https://android.googlesource.com/platform/prebuilts/sdk/+/refs/tags/android-12.0.0_r2/current/androidx/Android.bp#2695
+    // https://android.googlesource.com/platform/prebuilts/sdk/+/refs/tags/android-13.0.0_r3/current/androidx/Android.bp#3597
     androidx_preference: dependencies.create('androidx.preference:preference') {
-        version { strictly '1.1.1' } // should be 1.2.0-alpha01, but that is not even released, yet
+        version { strictly '1.2.0-alpha01' }
     },
-    // https://android.googlesource.com/platform/prebuilts/sdk/+/refs/tags/android-12.0.0_r2/current/androidx/Android.bp#1820
+    // https://android.googlesource.com/platform/prebuilts/sdk/+/refs/tags/android-13.0.0_r3/current/androidx/Android.bp#2754
     androidx_lifecycle_viewmodel_ktx: dependencies.create('androidx.lifecycle:lifecycle-viewmodel-ktx') {
-        version { strictly '2.4.0-alpha01' }
+        version { strictly '2.4.0-alpha03' } // 2.4.0-alpha04 in AOSP but was never released
     },
-    // https://android.googlesource.com/platform/prebuilts/sdk/+/refs/tags/android-12.0.0_r2/current/androidx/Android.bp#1618
+    // https://android.googlesource.com/platform/prebuilts/sdk/+/refs/tags/android-13.0.0_r3/current/androidx/Android.bp#2550
     androidx_lifecycle_livedata_ktx: dependencies.create('androidx.lifecycle:lifecycle-livedata-ktx') {
-        version { strictly '2.4.0-alpha01' }
+        version { strictly '2.4.0-alpha03' } // 2.4.0-alpha04 in AOSP but was never released
     },
-    // https://android.googlesource.com/platform/prebuilts/sdk/+/refs/tags/android-12.0.0_r2/current/extras/constraint-layout-x/Android.bp#39
+    // https://android.googlesource.com/platform/prebuilts/sdk/+/refs/tags/android-13.0.0_r3/current/extras/constraint-layout-x/Android.bp#39
     androidx_constraintlayout: dependencies.create('androidx.constraintlayout:constraintlayout') {
         version { strictly '2.0.0-beta7' }
     },
-    // https://android.googlesource.com/platform/prebuilts/sdk/+/refs/tags/android-12.0.0_r2/current/androidx/Android.bp#969
+    // https://android.googlesource.com/platform/prebuilts/sdk/+/refs/tags/android-13.0.0_r3/current/androidx/Android.bp#1865
     androidx_documentfile: dependencies.create('androidx.documentfile:documentfile') {
-        version { strictly '1.1.0-alpha01' }
+        version { strictly '1.1.0-alpha01' } // 1.1.0-alpha02 in AOSP but not released yet
     },
-    // https://android.googlesource.com/platform/prebuilts/sdk/+/refs/tags/android-12.0.0_r2/current/extras/material-design-x/Android.bp#6
+    // https://android.googlesource.com/platform/prebuilts/sdk/+/refs/tags/android-13.0.0_r3/current/extras/material-design-x/Android.bp#6
     com_google_android_material: dependencies.create('com.google.android.material:material') {
-        version { strictly '1.4.0' }
+        version { strictly '1.6.0-alpha03' } // 1.6.0-alpha0301 in AOSP
     },
 ]
 
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 20d1c07e..6b46f328 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,7 +1,7 @@
-#Tue Aug 04 14:40:48 BRT 2020
+#Fri Aug 19 10:56:09 IST 2022
 distributionBase=GRADLE_USER_HOME
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.3.3-bin.zip
 distributionPath=wrapper/dists
-zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.2-all.zip
-distributionSha256Sum=a8da5b02437a60819cad23e10fc7e9cf32bcb57029d9cb277e26eeff76ce014b
+zipStoreBase=GRADLE_USER_HOME
+distributionSha256Sum=b586e04868a22fd817c8971330fec37e298f3242eb85c374181b12d637f80302
diff --git a/storage/demo/build.gradle b/storage/demo/build.gradle
index 6950ebc8..c99f2060 100644
--- a/storage/demo/build.gradle
+++ b/storage/demo/build.gradle
@@ -27,11 +27,11 @@ android {
         }
     }
     compileOptions {
-        sourceCompatibility JavaVersion.VERSION_1_8
-        targetCompatibility JavaVersion.VERSION_1_8
+        sourceCompatibility = JavaVersion.VERSION_11
+        targetCompatibility = JavaVersion.VERSION_11
     }
     kotlinOptions {
-        jvmTarget = '1.8'
+        jvmTarget = JavaVersion.VERSION_11.toString()
         freeCompilerArgs += "-Xopt-in=kotlin.RequiresOptIn"
     }
     lintOptions {
diff --git a/storage/lib/Android.bp b/storage/lib/Android.bp
index 88113b1d..afb15df2 100644
--- a/storage/lib/Android.bp
+++ b/storage/lib/Android.bp
@@ -22,6 +22,8 @@ android_library {
         "androidx.room_room-runtime",
         "androidx-constraintlayout_constraintlayout",
         "com.google.android.material_material",
+        "kotlinx-coroutines-android",
+        "kotlinx-coroutines-core",
     ],
     plugins: [
         "androidx.room_room-compiler-plugin",
diff --git a/storage/lib/build.gradle b/storage/lib/build.gradle
index e9544b3d..ae711395 100644
--- a/storage/lib/build.gradle
+++ b/storage/lib/build.gradle
@@ -28,12 +28,12 @@ android {
         }
     }
     compileOptions {
-        sourceCompatibility JavaVersion.VERSION_1_8
-        targetCompatibility JavaVersion.VERSION_1_8
+        sourceCompatibility = JavaVersion.VERSION_11
+        targetCompatibility = JavaVersion.VERSION_11
     }
     kotlinOptions {
-        jvmTarget = '1.8'
-        languageVersion = "1.4"
+        jvmTarget = JavaVersion.VERSION_11.toString()
+        languageVersion = "1.6"
         freeCompilerArgs += '-Xopt-in=kotlin.RequiresOptIn'
         freeCompilerArgs += '-Xexplicit-api=strict'
     }
diff --git a/storage/lib/src/main/java/org/calyxos/backup/storage/backup/Backup.kt b/storage/lib/src/main/java/org/calyxos/backup/storage/backup/Backup.kt
index 48c74c2e..14dd470f 100644
--- a/storage/lib/src/main/java/org/calyxos/backup/storage/backup/Backup.kt
+++ b/storage/lib/src/main/java/org/calyxos/backup/storage/backup/Backup.kt
@@ -111,11 +111,12 @@ internal class Backup(
             }
             Log.e(TAG, "Changed files backup took $duration")
         } finally {
-            backupObserver?.onBackupComplete(duration?.toLongMilliseconds())
+            backupObserver?.onBackupComplete(duration?.inWholeMilliseconds)
         }
     }
 
     @Throws(IOException::class, GeneralSecurityException::class)
+    @OptIn(ExperimentalTime::class)
     private suspend fun backupFiles(
         filesResult: FileScannerResult,
         availableChunkIds: HashSet<String>,
diff --git a/storage/lib/src/main/java/org/calyxos/backup/storage/backup/ChunksCacheRepopulater.kt b/storage/lib/src/main/java/org/calyxos/backup/storage/backup/ChunksCacheRepopulater.kt
index 764e994f..0b38d48e 100644
--- a/storage/lib/src/main/java/org/calyxos/backup/storage/backup/ChunksCacheRepopulater.kt
+++ b/storage/lib/src/main/java/org/calyxos/backup/storage/backup/ChunksCacheRepopulater.kt
@@ -8,7 +8,7 @@ import org.calyxos.backup.storage.measure
 import org.calyxos.backup.storage.plugin.SnapshotRetriever
 import java.io.IOException
 import java.security.GeneralSecurityException
-import java.util.concurrent.TimeUnit.MILLISECONDS
+import kotlin.time.DurationUnit.MILLISECONDS
 import kotlin.time.ExperimentalTime
 import kotlin.time.toDuration
 
diff --git a/storage/lib/src/main/java/org/calyxos/backup/storage/plugin/saf/SafStoragePlugin.kt b/storage/lib/src/main/java/org/calyxos/backup/storage/plugin/saf/SafStoragePlugin.kt
index 6c143315..090ad385 100644
--- a/storage/lib/src/main/java/org/calyxos/backup/storage/plugin/saf/SafStoragePlugin.kt
+++ b/storage/lib/src/main/java/org/calyxos/backup/storage/plugin/saf/SafStoragePlugin.kt
@@ -18,6 +18,7 @@ import org.calyxos.backup.storage.plugin.saf.DocumentFileExt.listFilesBlocking
 import java.io.IOException
 import java.io.InputStream
 import java.io.OutputStream
+import kotlin.time.ExperimentalTime
 
 private val folderRegex = Regex("^[a-f0-9]{16}\\.sv$")
 private val chunkFolderRegex = Regex("[a-f0-9]{2}")
@@ -89,6 +90,7 @@ public abstract class SafStoragePlugin(
      * Chunk folders will get cached in the given [chunkFolders] for faster access.
      */
     @Throws(IOException::class)
+    @OptIn(ExperimentalTime::class)
     private suspend fun populateChunkFolders(
         folder: DocumentFile,
         chunkFolders: HashMap<String, DocumentFile>,
@@ -126,6 +128,7 @@ public abstract class SafStoragePlugin(
     }
 
     @Throws(IOException::class)
+    @OptIn(ExperimentalTime::class)
     private fun createMissingChunkFolders(
         root: DocumentFile,
         chunkFolders: HashMap<String, DocumentFile>,
diff --git a/storage/lib/src/main/java/org/calyxos/backup/storage/prune/Pruner.kt b/storage/lib/src/main/java/org/calyxos/backup/storage/prune/Pruner.kt
index 17350158..3e503e86 100644
--- a/storage/lib/src/main/java/org/calyxos/backup/storage/prune/Pruner.kt
+++ b/storage/lib/src/main/java/org/calyxos/backup/storage/prune/Pruner.kt
@@ -47,7 +47,7 @@ internal class Pruner(
             }
         }
         Log.i(TAG, "Pruning took $duration")
-        backupObserver?.onPruneComplete(duration.toLongMilliseconds())
+        backupObserver?.onPruneComplete(duration.inWholeMilliseconds)
     }
 
     @Throws(IOException::class, GeneralSecurityException::class)
diff --git a/storage/lib/src/main/java/org/calyxos/backup/storage/restore/Restore.kt b/storage/lib/src/main/java/org/calyxos/backup/storage/restore/Restore.kt
index 297c1d5c..b338ac6d 100644
--- a/storage/lib/src/main/java/org/calyxos/backup/storage/restore/Restore.kt
+++ b/storage/lib/src/main/java/org/calyxos/backup/storage/restore/Restore.kt
@@ -52,6 +52,7 @@ internal class Restore(
         MultiChunkRestore(context, storagePlugin, fileRestore, streamCrypto, streamKey)
     }
 
+    @OptIn(ExperimentalTime::class)
     fun getBackupSnapshots(): Flow<SnapshotResult> = flow {
         val numSnapshots: Int
         val time = measure {
@@ -138,7 +139,7 @@ internal class Restore(
         Log.e(TAG, "Restoring ${split.multiChunkFiles.size} multi chunks took $multiChunkDuration.")
 
         val totalDuration = smallFilesDuration + singleChunkDuration + multiChunkDuration
-        observer?.onRestoreComplete(totalDuration.toLongMilliseconds())
+        observer?.onRestoreComplete(totalDuration.inWholeMilliseconds)
         Log.e(TAG, "Restored $restoredFiles/$filesTotal files.")
     }
 
diff --git a/storage/lib/src/main/java/org/calyxos/backup/storage/scanner/FileScanner.kt b/storage/lib/src/main/java/org/calyxos/backup/storage/scanner/FileScanner.kt
index bbce61c4..02d9cbdb 100644
--- a/storage/lib/src/main/java/org/calyxos/backup/storage/scanner/FileScanner.kt
+++ b/storage/lib/src/main/java/org/calyxos/backup/storage/scanner/FileScanner.kt
@@ -11,6 +11,7 @@ import org.calyxos.backup.storage.content.DocFile
 import org.calyxos.backup.storage.content.MediaFile
 import org.calyxos.backup.storage.db.UriStore
 import org.calyxos.backup.storage.measure
+import kotlin.time.ExperimentalTime
 
 internal class FileScannerResult(
     val smallFiles: List<ContentFile>,
@@ -30,6 +31,7 @@ internal class FileScanner(
         private const val FILES_LARGE = "large"
     }
 
+    @OptIn(ExperimentalTime::class)
     fun getFiles(): FileScannerResult {
         // scan both APIs
         val mediaFiles = ArrayList<ContentFile>()