diff --git a/app/build.gradle b/app/build.gradle
index 5b39c7b..abb02b3 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -3,13 +3,13 @@ apply plugin: 'kotlin-android'
 
 android {
     compileSdkVersion 28
-    buildToolsVersion "28.0.2"
+    buildToolsVersion "28.0.3"
     defaultConfig {
         applicationId "telegra.ph"
         minSdkVersion 17
         targetSdkVersion 28
-        versionCode 14
-        versionName "1.5.1"
+        versionCode 15
+        versionName "1.5.2"
         resConfigs "en", "de"
     }
     buildTypes {
@@ -27,13 +27,13 @@ android {
 }
 
 dependencies {
-    implementation 'androidx.appcompat:appcompat:1.0.0'
+    implementation 'androidx.appcompat:appcompat:1.0.2'
     implementation 'androidx.recyclerview:recyclerview:1.0.0'
     implementation 'androidx.legacy:legacy-support-v13:1.0.0'
     implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
-    implementation 'com.github.delight-im:Android-AdvancedWebView:v3.1.3'
-    implementation 'com.afollestad.material-dialogs:core:2.0.0-alpha11'
-    implementation 'com.afollestad.material-dialogs:input:2.0.0-alpha11'
-    implementation 'com.github.kittinunf.fuel:fuel:1.15.0'
-    implementation 'com.github.kittinunf.fuel:fuel-android:1.15.0'
+    implementation 'com.github.delight-im:Android-AdvancedWebView:3.1.3'
+    implementation 'com.afollestad.material-dialogs:core:2.0.0-rc7'
+    implementation 'com.afollestad.material-dialogs:input:2.0.0-rc7'
+    implementation 'com.github.kittinunf.fuel:fuel:1.16.0'
+    implementation 'com.github.kittinunf.fuel:fuel-android:1.16.0'
 }
diff --git a/app/src/main/assets/editor.html b/app/src/main/assets/editor.html
index 12117aa..6aa2438 100644
--- a/app/src/main/assets/editor.html
+++ b/app/src/main/assets/editor.html
@@ -5,7 +5,7 @@
 	<meta charset="utf-8">
 	<meta http-equiv="X-UA-Compatible" content="IE=edge">
 	<meta name="viewport" content="width=device-width, initial-scale=1">
-	<link href="http://cdnjs.cloudflare.com/ajax/libs/summernote/0.8.10/summernote-lite.css" rel="stylesheet">
+	<link href="https://cdnjs.cloudflare.com/ajax/libs/summernote/0.8.11/summernote-lite.css" rel="stylesheet">
 	<style>
 		* {
 			max-width: 100% !important;
@@ -27,8 +27,8 @@
 
 <body>
 	<div id="summernote"></div>
-	<script src="http://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
-	<script src="http://cdnjs.cloudflare.com/ajax/libs/summernote/0.8.9/summernote-lite.min.js"></script>
+	<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
+	<script src="https://cdnjs.cloudflare.com/ajax/libs/summernote/0.8.9/summernote-lite.min.js"></script>
 	<script>
 		function domToNode(domNode) {
 			if (domNode.nodeType == domNode.TEXT_NODE) {
@@ -68,7 +68,7 @@
 			$.ajax({
 				data: data,
 				type: "POST",
-				url: "http://telegra.ph/upload",
+				url: "https://telegra.ph/upload",
 				cache: false,
 				contentType: false,
 				processData: false,
diff --git a/app/src/main/assets/viewer.html b/app/src/main/assets/viewer.html
index 8913c4a..59edacb 100644
--- a/app/src/main/assets/viewer.html
+++ b/app/src/main/assets/viewer.html
@@ -6,7 +6,7 @@
 	<meta http-equiv="X-UA-Compatible" content="IE=edge">
 	<meta name="viewport" content="width=device-width, initial-scale=1">
 	<link rel="stylesheet"
-	      href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.1.3/css/bootstrap.min.css">
+	      href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.2.1/css/bootstrap.min.css">
 	<style>
 		* {
 			max-width: 100% !important;
@@ -25,7 +25,7 @@
 	<div id="viewerViews"></div>
 	<div id="viewerContent"></div>
 </main>
-<script src="http://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
+<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
 <script>
 
 		function setTitle(title) {
diff --git a/app/src/main/java/telegra/ph/Editor.kt b/app/src/main/java/telegra/ph/Editor.kt
index 1a1f1c4..60b114e 100644
--- a/app/src/main/java/telegra/ph/Editor.kt
+++ b/app/src/main/java/telegra/ph/Editor.kt
@@ -27,7 +27,8 @@ class Editor : AdvancedWebView {
 		this.addJavascriptInterface(MyJavaScriptInterface(), "android")
 		this.settings.loadWithOverviewMode = true
 		this.settings.useWideViewPort = true
-		this.loadDataWithBaseURL("http://telegra.ph", context.assets.open("editor.html").bufferedReader().readText(), "text/html", "utf-8", null)
+		setMixedContentAllowed(true)
+		this.loadDataWithBaseURL("https://telegra.ph", context.assets.open("editor.html").bufferedReader().readText(), "text/html", "utf-8", null)
 	}
 
 	private inner class MyJavaScriptInterface {
diff --git a/app/src/main/java/telegra/ph/MainActivity.kt b/app/src/main/java/telegra/ph/MainActivity.kt
index e101ea8..93763b1 100644
--- a/app/src/main/java/telegra/ph/MainActivity.kt
+++ b/app/src/main/java/telegra/ph/MainActivity.kt
@@ -4,12 +4,13 @@ import android.content.Intent
 import android.graphics.Bitmap
 import android.net.Uri
 import android.os.Bundle
-import androidx.appcompat.app.AppCompatActivity
 import android.view.Menu
 import android.view.MenuItem
 import android.view.View
+import androidx.appcompat.app.AppCompatActivity
 import com.afollestad.materialdialogs.MaterialDialog
 import com.afollestad.materialdialogs.input.input
+import com.afollestad.materialdialogs.list.listItemsMultiChoice
 import com.afollestad.materialdialogs.list.listItemsSingleChoice
 import im.delight.android.webview.AdvancedWebView
 import java.net.URI
@@ -188,12 +189,12 @@ class MainActivity : AppCompatActivity(), AdvancedWebView.Listener {
 					MaterialDialog(this)
 							.title(R.string.title_question)
 							.input(hintRes = R.string.title_hint, prefill = currentPage?.title
-									?: "") { _, title ->
+									?: "", allowEmpty = false) { _, title ->
 								MaterialDialog(this)
 										.title(R.string.name_question)
 										.input(hintRes = R.string.name_hint, prefill = if (isEdit) currentPage?.authorName
 												?: authorName ?: "" else authorName
-												?: "") { _, name ->
+												?: "", allowEmpty = true) { _, name ->
 											if (!isEdit) authorName = name.toString()
 											if (isEdit) TelegraphApi.editPage(accessToken, currentPage?.path
 													?: "", authorName = name.toString(), title = title.toString(), content = json
@@ -232,14 +233,15 @@ class MainActivity : AppCompatActivity(), AdvancedWebView.Listener {
 						.title(R.string.delete_bookmark)
 						.positiveButton(R.string.delete)
 						.negativeButton(android.R.string.cancel)
-						.listItemsSingleChoice(items = bookmarks().reversed().map { it.second }) { _, index, _ ->
+						.listItemsMultiChoice(items = bookmarks().reversed().map { it.second }) { _, indices, _ ->
 							MaterialDialog(this)
 									.title(R.string.delete)
 									.message(R.string.delete_question)
 									.positiveButton(android.R.string.yes)
 									.negativeButton(android.R.string.no)
-									.positiveButton { _ ->
-										deleteBookmark(bookmarks().reversed().map { it.first }[index])
+									.positiveButton {
+										val tmpBookmarks = bookmarks().reversed().map { it.first }
+										for (index in indices) deleteBookmark(tmpBookmarks[index])
 									}
 									.show()
 						}
@@ -265,7 +267,7 @@ class MainActivity : AppCompatActivity(), AdvancedWebView.Listener {
 				MaterialDialog(this)
 						.title(R.string.title_question)
 						.input(hintRes = R.string.title_hint, prefill = currentPage?.title
-								?: "") { _, input ->
+								?: "", allowEmpty = false) { _, input ->
 							val curPage = currentPage
 							if (curPage?.url != null) addBookmark(curPage.url.split("/").last(), input.toString())
 						}
@@ -281,12 +283,9 @@ class MainActivity : AppCompatActivity(), AdvancedWebView.Listener {
 				startActivity(Intent.createChooser(shareIntent, getString(R.string.share)))
 				true
 			}
-			R.id.help -> {
-				MaterialDialog(this)
-						.title(R.string.help)
-						.message(R.string.help_text)
-						.positiveButton(android.R.string.ok)
-						.show()
+			R.id.about -> {
+				val aboutIntent = Intent(Intent.ACTION_VIEW, Uri.parse("https://github.com/jlelse/teleposter"))
+				startActivity(aboutIntent)
 				true
 			}
 			R.id.login -> {
@@ -294,7 +293,7 @@ class MainActivity : AppCompatActivity(), AdvancedWebView.Listener {
 						.title(R.string.login)
 						.message(R.string.login_desc)
 						.positiveButton(android.R.string.ok)
-						.positiveButton { _ ->
+						.positiveButton {
 							startActivity(Intent(Intent.ACTION_VIEW, Uri.parse("https://t.me/telegraph")))
 						}
 						.show()
diff --git a/app/src/main/java/telegra/ph/TelegraphApi.kt b/app/src/main/java/telegra/ph/TelegraphApi.kt
index d3b858d..e078f3c 100644
--- a/app/src/main/java/telegra/ph/TelegraphApi.kt
+++ b/app/src/main/java/telegra/ph/TelegraphApi.kt
@@ -1,6 +1,5 @@
 package telegra.ph
 
-import com.github.kittinunf.fuel.Fuel
 import com.github.kittinunf.fuel.android.core.Json
 import com.github.kittinunf.fuel.android.extension.responseJson
 import com.github.kittinunf.fuel.core.FuelError
@@ -140,6 +139,9 @@ object TelegraphApi {
 				if (optJSONObject(i) == null) optString(i)?.let {
 					content += it
 				}
+				// Fix mixed content
+				content = content.replace("http://telegra.ph", "https://telegra.ph")
+				content = content.replace("http://graph.org", "https://graph.org")
 			}
 			return content
 		}
diff --git a/app/src/main/java/telegra/ph/Viewer.kt b/app/src/main/java/telegra/ph/Viewer.kt
index bdace7a..4658f4d 100644
--- a/app/src/main/java/telegra/ph/Viewer.kt
+++ b/app/src/main/java/telegra/ph/Viewer.kt
@@ -27,7 +27,7 @@ class Viewer : AdvancedWebView {
 		this.settings.useWideViewPort = true
 		overScrollMode = View.OVER_SCROLL_NEVER
 		setMixedContentAllowed(true)
-		this.loadDataWithBaseURL("http://telegra.ph", context.assets.open("viewer.html").bufferedReader().readText(), "text/html", "utf-8", null)
+		this.loadDataWithBaseURL("https://telegra.ph", context.assets.open("viewer.html").bufferedReader().readText(), "text/html", "utf-8", null)
 	}
 
 	fun setArticleTitle(title: String) {
diff --git a/app/src/main/res/menu/activity_main.xml b/app/src/main/res/menu/activity_main.xml
index 1db753d..44fea68 100644
--- a/app/src/main/res/menu/activity_main.xml
+++ b/app/src/main/res/menu/activity_main.xml
@@ -42,7 +42,7 @@
 		android:title="@string/login"
 		app:showAsAction="never" />
 	<item
-		android:id="@+id/help"
-		android:title="@string/help"
+		android:id="@+id/about"
+		android:title="@string/about"
 		app:showAsAction="never" />
 </menu>
\ No newline at end of file
diff --git a/app/src/main/res/values-de/strings.xml b/app/src/main/res/values-de/strings.xml
index d478368..2a30c5b 100644
--- a/app/src/main/res/values-de/strings.xml
+++ b/app/src/main/res/values-de/strings.xml
@@ -1,9 +1,7 @@
 <resources>
 	<string name="app_name">Teleposter</string>
 	<string name="share">Teilen</string>
-	<string name="help">Hilfe</string>
-	<string name="help_text">
-		<![CDATA[<h3>Verwendete Bibliotheken</h3><a href=\"https://github.com/afollestad/material-dialogs\">Material Dialogs</a>, <a href=\"https://github.com/kittinunf/Fuel\">Fuel</a>, <a href=\"https://github.com/delight-im/Android-AdvancedWebView\">AdvancedWebView</a><h3>About</h3>Diese App wurde von <a href="https://jlelse.me">Jan-Lukas Else</a> entwickelt und der Code bei <a href="https://github.com/jlelse/teleposter">Github</a> veröffentlicht.]]></string>
+	<string name="about">Über</string>
 	<string name="bookmarks">Lesezeichen</string>
 	<string name="bookmark_this">Als Lesezeichen setzen</string>
 	<string name="delete_bookmark">Lesezeichen löschen</string>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index a39ec7d..b6ee059 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1,9 +1,7 @@
 <resources>
 	<string name="app_name">Teleposter</string>
 	<string name="share">Share</string>
-	<string name="help">Help</string>
-	<string name="help_text">
-		<![CDATA[<h3>Used libraries</h3><a href=\"https://github.com/afollestad/material-dialogs\">Material Dialogs</a>, <a href=\"https://github.com/kittinunf/Fuel\">Fuel</a>, <a href=\"https://github.com/delight-im/Android-AdvancedWebView\">AdvancedWebView</a><h3>About</h3>This app is made by <a href="https://jlelse.me">Jan-Lukas Else</a> and it\'s code is published on <a href="https://github.com/jlelse/teleposter">Github</a>.]]></string>
+	<string name="about">About</string>
 	<string name="bookmarks">Bookmarks</string>
 	<string name="bookmark_this">Bookmark this</string>
 	<string name="delete_bookmark">Delete Bookmark</string>
diff --git a/build.gradle b/build.gradle
index 6e4e352..9b07890 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,12 +1,12 @@
 buildscript {
-    ext.kotlin_version = '1.2.70'
+    ext.kotlin_version = '1.3.11'
     repositories {
         jcenter()
         mavenCentral()
         google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.3.0-alpha11'
+        classpath 'com.android.tools.build:gradle:3.3.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
index 1353677..87b738c 100644
Binary files a/gradle/wrapper/gradle-wrapper.jar and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 5c1b6c9..6b3851a 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.10.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.1-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/gradlew b/gradlew
index cccdd3d..af6708f 100755
--- a/gradlew
+++ b/gradlew
@@ -28,7 +28,7 @@ APP_NAME="Gradle"
 APP_BASE_NAME=`basename "$0"`
 
 # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-DEFAULT_JVM_OPTS=""
+DEFAULT_JVM_OPTS='"-Xmx64m"'
 
 # Use the maximum available, or set MAX_FD != -1 to use that value.
 MAX_FD="maximum"
diff --git a/gradlew.bat b/gradlew.bat
index e95643d..0f8d593 100755
--- a/gradlew.bat
+++ b/gradlew.bat
@@ -14,7 +14,7 @@ set APP_BASE_NAME=%~n0
 set APP_HOME=%DIRNAME%
 
 @rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-set DEFAULT_JVM_OPTS=
+set DEFAULT_JVM_OPTS="-Xmx64m"
 
 @rem Find java.exe
 if defined JAVA_HOME goto findJavaFromJavaHome
