diff --git a/build.gradle b/build.gradle
index d227775d37..f3b09c0f75 100644
--- a/build.gradle
+++ b/build.gradle
@@ -14,7 +14,7 @@ buildscript {
         google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.0.1'
+        classpath 'com.android.tools.build:gradle:3.1.0'
         classpath 'com.google.gms:google-services:3.0.0'
     }
 }
@@ -30,7 +30,7 @@ configurations.all {
 }
 
 ext {
-    supportLibraryVersion = '26.1.0'
+    supportLibraryVersion = '27.1.0'
     googleLibraryVersion = '11.2.2'
     androidLibraryVersion = '1.0.40'
 
@@ -69,12 +69,12 @@ android {
         javaMaxHeapSize "4g"
     }
 
-    compileSdkVersion 26
-    buildToolsVersion '26.0.2'
+    compileSdkVersion 27
+    buildToolsVersion '27.0.3'
 
     defaultConfig {
         minSdkVersion 14
-        targetSdkVersion 26 
+        targetSdkVersion 27
 
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
 
@@ -226,7 +226,9 @@ dependencies {
     // implementation "com.google.firebase:firebase-core:${googleLibraryVersion}"
     implementation 'org.parceler:parceler-api:1.1.9'
     annotationProcessor 'org.parceler:parceler:1.1.9'
-    implementation 'com.github.bumptech.glide:glide:3.7.0'
+    implementation ('com.github.bumptech.glide:glide:3.7.0') {
+        exclude group: "com.android.support"
+    }
     implementation 'com.caverock:androidsvg:1.2.1'
     implementation "com.android.support:support-annotations:${supportLibraryVersion}"
     implementation 'com.google.code.gson:gson:2.8.2'
@@ -249,7 +251,7 @@ dependencies {
     //androidTestImplementation "com.android.support:support-annotations:${supportLibraryVersion}"
     implementation 'org.jetbrains:annotations:15.0'
 
-    androidTestCompile 'tools.fastlane:screengrab:1.0.0'
+    androidTestImplementation 'tools.fastlane:screengrab:1.0.0'
 }
 
 configurations.all {
diff --git a/gradle.properties b/gradle.properties
index e8b10e2b5c..e69de29bb2 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1 +0,0 @@
-android.enableAapt2=false
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 45b63bc7e5..4decf17a36 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
-#Fri May 05 19:09:31 CEST 2017
+#Tue Apr 03 16:56:17 CEST 2018
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.4-all.zip
diff --git a/src/main/java/com/owncloud/android/media/MediaService.java b/src/main/java/com/owncloud/android/media/MediaService.java
index 83f4aab77f..22ccb7bead 100644
--- a/src/main/java/com/owncloud/android/media/MediaService.java
+++ b/src/main/java/com/owncloud/android/media/MediaService.java
@@ -34,7 +34,7 @@ import android.net.wifi.WifiManager;
 import android.net.wifi.WifiManager.WifiLock;
 import android.os.IBinder;
 import android.os.PowerManager;
-import android.support.v7.app.NotificationCompat;
+import android.support.v4.app.NotificationCompat;
 import android.widget.Toast;
 
 import com.owncloud.android.R;
diff --git a/src/main/res/values-v19/styles.xml b/src/main/res/values-v19/styles.xml
index eeb57c04c2..f74e4bcada 100644
--- a/src/main/res/values-v19/styles.xml
+++ b/src/main/res/values-v19/styles.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
 
-    <style name="Theme.ownCloud.Overlay" parent="style/Theme.ownCloud">
+    <style name="Theme.ownCloud.Overlay" parent="Theme.ownCloud">
         <item name="android:actionBarStyle">@style/Theme.ownCloud.Overlay.ActionBar</item>
         <item name="android:windowActionBarOverlay">true</item>
         <item name="android:windowFullscreen">true</item>
diff --git a/src/main/res/values/styles.xml b/src/main/res/values/styles.xml
index 48a35de7f4..c4eda59c4f 100644
--- a/src/main/res/values/styles.xml
+++ b/src/main/res/values/styles.xml
@@ -126,7 +126,7 @@
 	</style>
 
 	<!-- separat translucent action bar style -->
-	<style name="Theme.ownCloud.Overlay" parent="style/Theme.ownCloud">
+	<style name="Theme.ownCloud.Overlay" parent="@style/Theme.ownCloud">
 		<item name="android:actionBarStyle">@style/Theme.ownCloud.Overlay.ActionBar</item>
 		<item name="android:windowActionBarOverlay">true</item>
 		<item name="android:windowFullscreen">true</item>
@@ -145,19 +145,19 @@
 	</style>
 
 	<!-- Progress bar -->
-	<style name="Widget.ownCloud.TopProgressBar" parent="style/Widget.AppCompat.ProgressBar.Horizontal">
+	<style name="Widget.ownCloud.TopProgressBar" parent="@style/Widget.AppCompat.ProgressBar.Horizontal">
 		<item name="android:progressDrawable">@drawable/actionbar_progress_horizontal</item>
 		<item name="android:indeterminateDrawable">@drawable/actionbar_progress_indeterminate_horizontal</item>
 	</style>
 
-	<style name="Theme.ownCloud.Fullscreen" parent="style/Theme.AppCompat">
+	<style name="Theme.ownCloud.Fullscreen" parent="@style/Theme.AppCompat">
         <item name="android:windowFullscreen">true</item>
 		<item name="colorAccent">@color/color_accent</item>
     </style>
 	
 	
 	<style name="Theme.ownCloud.Widget.ActionBar"
-		parent="style/Widget.AppCompat.Light.ActionBar.Solid.Inverse">
+		parent="@style/Widget.AppCompat.Light.ActionBar.Solid.Inverse">
 		<item name="android:background">@color/primary</item>
 		<item name="background">@color/primary</item>
     	<item name="android:textColor">#ffffff</item>
@@ -168,19 +168,19 @@
 	</style>
 
 	<!-- Dialogs -->
-	<style name="Theme.ownCloud.Dialog" parent="style/Theme.AppCompat.Light.Dialog.Alert">
+	<style name="Theme.ownCloud.Dialog" parent="@style/Theme.AppCompat.Light.Dialog.Alert">
 		<item name="windowNoTitle">false</item>
 		<item name="colorAccent">@color/color_accent</item>
 		<item name="buttonBarButtonStyle">@style/Theme.ownCloud.Dialog.ButtonBar.Button</item>
 		<item name="buttonBarStyle">@style/Theme.ownCloud.Dialog.ButtonBar</item>
 	</style>
 
-	<style name="Theme.ownCloud.Dialog.NoTitle" parent="style/Theme.ownCloud.Dialog">
+	<style name="Theme.ownCloud.Dialog.NoTitle" parent="@style/Theme.ownCloud.Dialog">
 		<item name="windowNoTitle">true</item>
 		<item name="colorAccent">@color/color_accent</item>
 	</style>
 
-	<style name="Theme.ownCloud.Dialog.NoButtonBarStyle" parent="style/Theme.AppCompat.Light.Dialog.Alert">
+	<style name="Theme.ownCloud.Dialog.NoButtonBarStyle" parent="@style/Theme.AppCompat.Light.Dialog.Alert">
 		<item name="windowNoTitle">false</item>
 		<item name="colorAccent">@color/color_accent</item>
 	</style>
@@ -200,7 +200,7 @@
 	fix see:
 		http://stackoverflow.com/questions/27187353/dialog-buttons-with-long-text-not-wrapping-squeezed-out-material-theme-on-an
 	 -->
-	<style name="Theme.ownCloud.Dialog.ButtonBar" parent="style/Widget.AppCompat.Button.ButtonBar.AlertDialog">
+	<style name="Theme.ownCloud.Dialog.ButtonBar" parent="@style/Widget.AppCompat.Button.ButtonBar.AlertDialog">
 		<!-- Making sure, the button bar uses parent width and is not restricted in height -->
 		<item name="android:layout_width">match_parent</item>
 		<item name="android:layout_height">wrap_content</item>
@@ -208,7 +208,7 @@
 		<item name="android:minHeight">@null</item>
 	</style>
 
-	<style name="Theme.ownCloud.Dialog.ButtonBar.Button" parent="style/Widget.AppCompat.Button.Borderless.Colored">
+	<style name="Theme.ownCloud.Dialog.ButtonBar.Button" parent="@style/Widget.AppCompat.Button.Borderless.Colored">
 		<!-- Setting the weight as follows should result in equally wide buttons filling the alert dialog width,
             but instead they span further out of the dialog, breaking in multiple lines though -->
 		<item name="android:layout_width">0dp</item>
@@ -237,10 +237,10 @@
     </style>
 
 	<!-- Text styles -->
-	<style name="NextcloudTextAppearanceHeadline" parent="style/TextAppearance.AppCompat.Headline">
+	<style name="NextcloudTextAppearanceHeadline" parent="@style/TextAppearance.AppCompat.Headline">
 		<item name="android:textSize">26sp</item>
 		<item name="android:textColor">#000000</item>
 	</style>
-	<style name="NextcloudTextAppearanceMedium" parent="style/TextAppearance.AppCompat.Medium">
+	<style name="NextcloudTextAppearanceMedium" parent="@style/TextAppearance.AppCompat.Medium">
 	</style>
 </resources>