diff --git a/.gitignore b/.gitignore
index f2d50bb..0168d0b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -74,3 +74,5 @@ lib/*private*.dart
 
 .flutter-plugins-dependencies
 
+local.properties
+.gradle
diff --git a/android/app/build.gradle b/android/app/build.gradle
index c158a47..9e86530 100644
--- a/android/app/build.gradle
+++ b/android/app/build.gradle
@@ -33,7 +33,7 @@ if (keystorePropertiesFile.exists()) {
 }
 
 android {
-    compileSdkVersion 30
+    compileSdkVersion 31
 
     compileOptions {
 
@@ -50,7 +50,7 @@ android {
     defaultConfig {
         applicationId "org.communiquons.comunic"
         minSdkVersion 21
-        targetSdkVersion 30
+        targetSdkVersion 31
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
diff --git a/android/app/src/main/AndroidManifest.xml b/android/app/src/main/AndroidManifest.xml
index 79fef45..ae38908 100644
--- a/android/app/src/main/AndroidManifest.xml
+++ b/android/app/src/main/AndroidManifest.xml
@@ -59,7 +59,8 @@
             android:hardwareAccelerated="true"
             android:launchMode="singleTop"
             android:theme="@style/LaunchTheme"
-            android:windowSoftInputMode="adjustResize">
+            android:windowSoftInputMode="adjustResize"
+            android:exported="true">
             <!-- This keeps the window background of the activity showing
                  until Flutter renders its first frame. It can be removed if
                  there is no splash screen (such as the default splash screen
diff --git a/android/app/src/main/java/org/communiquons/comunic/independentnotifications/NotificationsService.java b/android/app/src/main/java/org/communiquons/comunic/independentnotifications/NotificationsService.java
index 27de683..8b65017 100644
--- a/android/app/src/main/java/org/communiquons/comunic/independentnotifications/NotificationsService.java
+++ b/android/app/src/main/java/org/communiquons/comunic/independentnotifications/NotificationsService.java
@@ -100,7 +100,10 @@ public class NotificationsService extends Service implements Runnable {
 
         Intent notificationIntent = new Intent(this, MainActivity.class);
         PendingIntent pendingIntent = PendingIntent.getActivity(this,
-                0, notificationIntent, 0);
+                0,
+                notificationIntent,
+                android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.M ? PendingIntent.FLAG_IMMUTABLE : 0);
+
         Notification notification = new NotificationCompat.Builder(this, SVC_CHANNEL_ID)
                 .setContentTitle("Comunic")
                 .setContentText(getText(R.string.independent_push_notification_notification_text))
@@ -197,12 +200,12 @@ public class NotificationsService extends Service implements Runnable {
         ws.setPingInterval(PING_INTERVAL);
         ws.addListener(new WebSocketAdapter() {
             @Override
-            public void onConnected(WebSocket websocket, Map<String, List<String>> headers) throws Exception {
+            public void onConnected(WebSocket websocket, Map<String, List<String>> headers) {
                 Log.v(TAG, "Connected to independent push notifications service!");
             }
 
             @Override
-            public void onDisconnected(WebSocket websocket, WebSocketFrame serverCloseFrame, WebSocketFrame clientCloseFrame, boolean closedByServer) throws Exception {
+            public void onDisconnected(WebSocket websocket, WebSocketFrame serverCloseFrame, WebSocketFrame clientCloseFrame, boolean closedByServer) {
                 Log.v(TAG, "Disconnected from independent push notifications websocket!");
                 synchronized (lock) {
                     lock.notify();
@@ -210,12 +213,12 @@ public class NotificationsService extends Service implements Runnable {
             }
 
             @Override
-            public void onTextFrame(WebSocket websocket, WebSocketFrame frame) throws Exception {
+            public void onTextFrame(WebSocket websocket, WebSocketFrame frame) {
                 handleTextFrame(frame);
             }
 
             @Override
-            public void onError(WebSocket websocket, WebSocketException cause) throws Exception {
+            public void onError(WebSocket websocket, WebSocketException cause) {
                 Log.e(TAG, "An error occured, closing WebSocket!");
                 cause.printStackTrace();
                 websocket.disconnect();
@@ -254,17 +257,14 @@ public class NotificationsService extends Service implements Runnable {
         }
     }
 
-    private void dropNotification(String id) throws Exception {
-        new Handler(Looper.getMainLooper()).post(new Runnable() {
-            @Override
-            public void run() {
-                NotificationManagerCompat notifManager = NotificationManagerCompat.from(NotificationsService.this);
-                notifManager.cancel(id, NOTIFS_ID);
-            }
+    private void dropNotification(String id) {
+        new Handler(Looper.getMainLooper()).post(() -> {
+            NotificationManagerCompat notifManager = NotificationManagerCompat.from(NotificationsService.this);
+            notifManager.cancel(id, NOTIFS_ID);
         });
     }
 
-    private void sendNotification(PushNotification n) throws Exception {
+    private void sendNotification(PushNotification n) {
         new Handler(Looper.getMainLooper()).post(() -> postNotification(n));
     }
 
@@ -273,7 +273,12 @@ public class NotificationsService extends Service implements Runnable {
         createPushNotificationChannel();
 
         Intent intent = new Intent(this, MainActivity.class);
-        PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, 0);
+        PendingIntent pendingIntent = PendingIntent.getActivity(
+                this,
+                0,
+                intent,
+                android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.M ? PendingIntent.FLAG_IMMUTABLE : 0
+        );
 
         NotificationCompat.Builder builder = new NotificationCompat.Builder(this, NOTIFS_CHANNEL_ID)
                 .setSmallIcon(R.drawable.ic_notifications)
diff --git a/android/build.gradle b/android/build.gradle
index a80972f..a672cda 100644
--- a/android/build.gradle
+++ b/android/build.gradle
@@ -1,21 +1,21 @@
 buildscript {
     repositories {
         google()
-        jcenter()
+        mavenCentral()
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.5.4'
+        classpath 'com.android.tools.build:gradle:4.1.3'
 
         // Firebase
-        classpath 'com.google.gms:google-services:4.3.5'
+        classpath 'com.google.gms:google-services:4.3.10'
     }
 }
 
 allprojects {
     repositories {
         google()
-        jcenter()
+        mavenCentral()
     }
 }