diff --git a/app/build.gradle b/app/build.gradle
index 74e04f154..87984796b 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -4,11 +4,11 @@ apply plugin: 'kotlin-kapt'
 
 
 android {
-    compileSdkVersion 29
+    compileSdkVersion 30
 
     defaultConfig {
         minSdkVersion 16 // Jelly Bean (4.1)
-        targetSdkVersion 29 // Android 10
+        targetSdkVersion 30 // Android 11
         applicationId "com.orgzly"
         versionCode 158
         versionName "1.8.5"
@@ -92,11 +92,13 @@ android {
          * javax.servlet.http. Referenced from com.dropbox.core.DbxStandardSessionStore.
          */
         disable 'InvalidPackage'
+
+        checkDependencies true
     }
 
     compileOptions {
-        sourceCompatibility JavaVersion.VERSION_1_8
-        targetCompatibility JavaVersion.VERSION_1_8
+        sourceCompatibility JavaVersion.VERSION_11
+        targetCompatibility JavaVersion.VERSION_11
     }
 
     packagingOptions {
diff --git a/app/src/androidTest/java/com/orgzly/android/misc/LogSomethingNotTest.kt b/app/src/androidTest/java/com/orgzly/android/misc/LogSomethingNotTest.kt
new file mode 100644
index 000000000..9f7b739a4
--- /dev/null
+++ b/app/src/androidTest/java/com/orgzly/android/misc/LogSomethingNotTest.kt
@@ -0,0 +1,25 @@
+package com.orgzly.android.misc
+
+import android.os.Environment
+import android.util.Log
+import com.orgzly.android.OrgzlyTest
+import org.junit.Test
+
+class LogSomethingNotTest : OrgzlyTest() {
+    @Test
+    fun testLink() {
+        Log.i(
+            "XXX", String.format(
+                """
+                    Environment.getExternalStorageDirectory: %s
+                    context.filesDir: %s
+                    context.getExternalFilesDir(null): %s
+                    context.getExternalFilesDir(DOWNLOADS): %s""".trimIndent(),
+                Environment.getExternalStorageDirectory(),
+                context.filesDir,
+                context.getExternalFilesDir(null),
+                context.getExternalFilesDir(Environment.DIRECTORY_DOWNLOADS)
+            )
+        );
+    }
+}
diff --git a/app/src/androidTest/java/com/orgzly/android/util/OrgFormatterLinkTest.kt b/app/src/androidTest/java/com/orgzly/android/util/OrgFormatterLinkTest.kt
index 05f5b6d29..9bd9229ac 100644
--- a/app/src/androidTest/java/com/orgzly/android/util/OrgFormatterLinkTest.kt
+++ b/app/src/androidTest/java/com/orgzly/android/util/OrgFormatterLinkTest.kt
@@ -1,10 +1,10 @@
 package com.orgzly.android.util
 
-import android.os.Environment
 import android.text.style.URLSpan
 import com.orgzly.android.ui.views.style.FileLinkSpan
 import com.orgzly.android.ui.views.style.IdLinkSpan
 import org.hamcrest.CoreMatchers.equalTo
+import org.junit.After
 import org.junit.Assert.assertThat
 import org.junit.Before
 import org.junit.Test
@@ -28,7 +28,7 @@ class OrgFormatterLinkTest(private val param: Parameter) : OrgFormatterTest() {
     override fun setUp() {
         super.setUp()
 
-        File(Environment.getExternalStorageDirectory(), "orgzly-tests").let { dir ->
+        File(context.cacheDir, "orgzly-tests").let { dir ->
             if (!dir.exists() && !dir.mkdirs()) {
                 throw IOException("Failed to create $dir")
             }
@@ -44,6 +44,15 @@ class OrgFormatterLinkTest(private val param: Parameter) : OrgFormatterTest() {
         }
     }
 
+    @After
+    override fun tearDown() {
+        super.tearDown()
+
+        File(context.cacheDir, "orgzly-tests").let { dir ->
+            dir.deleteRecursively()
+        }
+    }
+
     companion object {
         @JvmStatic @Parameterized.Parameters(name = "{index}: {0}")
         fun data(): Collection<Parameter> {
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index f463ae55f..52f7fa18b 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -12,8 +12,10 @@
     <!-- Initially added for checking available connections (for sync). -->
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
 
-    <!-- Required for: exporting files (Downloads), creating temporary files -->
-    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
+    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
+
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"
+        android:maxSdkVersion="28" />
 
     <!-- For BroadcastReceiver below -->
     <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>
diff --git a/app/src/main/java/com/orgzly/android/ui/settings/SettingsFragment.kt b/app/src/main/java/com/orgzly/android/ui/settings/SettingsFragment.kt
index c6de95623..89419540f 100644
--- a/app/src/main/java/com/orgzly/android/ui/settings/SettingsFragment.kt
+++ b/app/src/main/java/com/orgzly/android/ui/settings/SettingsFragment.kt
@@ -187,7 +187,7 @@ class SettingsFragment : PreferenceFragmentCompat(), SharedPreferences.OnSharedP
      * Called when a shared preference is modified in any way.
      * Used to update AppPreferences' static values and do any required post-settings-change work.
      */
-    override fun onSharedPreferenceChanged(sharedPreferences: SharedPreferences, key: String) {
+    override fun onSharedPreferenceChanged(sharedPreferences: SharedPreferences, key: String?) {
         if (BuildConfig.LOG_DEBUG) LogUtils.d(TAG, sharedPreferences, key)
 
         val activity = activity as? CommonActivity ?: return
diff --git a/app/src/main/java/com/orgzly/android/widgets/ListWidgetService.kt b/app/src/main/java/com/orgzly/android/widgets/ListWidgetService.kt
index 62bc1b3a8..47fb51a0d 100644
--- a/app/src/main/java/com/orgzly/android/widgets/ListWidgetService.kt
+++ b/app/src/main/java/com/orgzly/android/widgets/ListWidgetService.kt
@@ -38,9 +38,9 @@ class ListWidgetService : RemoteViewsService() {
     override fun onGetViewFactory(intent: Intent): RemoteViewsFactory {
         if (BuildConfig.LOG_DEBUG) LogUtils.d(TAG)
 
-        return ListWidgetViewsFactory(
-                applicationContext,
-                intent.getStringExtra(AppIntent.EXTRA_QUERY_STRING))
+        val queryString = intent.getStringExtra(AppIntent.EXTRA_QUERY_STRING) ?: ""
+
+        return ListWidgetViewsFactory(applicationContext, queryString)
     }
 
     private sealed class WidgetEntry(open val id: Long) {