diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 63a9ff7..90e4794 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -19,13 +19,12 @@
     package="com.android.messaging"
     android:installLocation="internalOnly">
 
-    <uses-sdk android:minSdkVersion="19" android:targetSdkVersion="29" />
+    <uses-sdk android:minSdkVersion="33" android:targetSdkVersion="34" />
 
     <!-- Application holds CPU wakelock while working in background -->
     <uses-permission android:name="android.permission.WAKE_LOCK" />
     <!-- Application needs SMS/MMS permissions -->
     <uses-permission android:name="android.permission.READ_SMS"/>
-    <uses-permission android:name="android.permission.WRITE_SMS"/>
     <uses-permission android:name="android.permission.RECEIVE_SMS"/>
     <uses-permission android:name="android.permission.RECEIVE_MMS"/>
     <uses-permission android:name="android.permission.SEND_SMS"/>
@@ -56,6 +55,7 @@
     <uses-feature android:name="android.hardware.camera.autofocus" android:required="false" />
     <uses-feature android:name="android.hardware.microphone" android:required="false" />
     <uses-feature android:name="android.hardware.screen.portrait" android:required="false" />
+    <uses-feature android:name="android.hardware.telephony" android:required="false" />
 
     <queries>
         <intent>
@@ -195,7 +195,8 @@
             android:theme="@style/BugleTheme.SettingsActivity"
             android:configChanges="orientation|screenSize|keyboardHidden"
             android:screenOrientation="user"
-            android:parentActivityName="com.android.messaging.ui.appsettings.SettingsActivity">
+            android:parentActivityName="com.android.messaging.ui.appsettings.SettingsActivity"
+            android:exported="true">
             <meta-data
                 android:name="android.support.PARENT_ACTIVITY"
                 android:exported="true"
diff --git a/src/com/android/messaging/datamodel/action/ActionServiceImpl.java b/src/com/android/messaging/datamodel/action/ActionServiceImpl.java
index d78bdc0..496274a 100644
--- a/src/com/android/messaging/datamodel/action/ActionServiceImpl.java
+++ b/src/com/android/messaging/datamodel/action/ActionServiceImpl.java
@@ -1,5 +1,6 @@
 /*
  * Copyright (C) 2015 The Android Open Source Project
+ * Copyright (C) 2024 The LineageOS Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -165,7 +166,8 @@ public class ActionServiceImpl extends JobIntentService {
                 final long delayMs) {
             final Context context = Factory.get().getApplicationContext();
             final PendingIntent pendingIntent = PendingIntent.getBroadcast(
-                    context, requestCode, intent, PendingIntent.FLAG_CANCEL_CURRENT);
+                    context, requestCode, intent,
+                    PendingIntent.FLAG_CANCEL_CURRENT | PendingIntent.FLAG_IMMUTABLE);
 
             final AlarmManager mgr =
                     (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
@@ -201,7 +203,7 @@ public class ActionServiceImpl extends JobIntentService {
             intent.addFlags(Intent.FLAG_RECEIVER_FOREGROUND);
         }
         return PendingIntent.getBroadcast(context, requestCode, intent,
-                PendingIntent.FLAG_UPDATE_CURRENT);
+                PendingIntent.FLAG_UPDATE_CURRENT | PendingIntent.FLAG_IMMUTABLE);
     }
 
     /**
diff --git a/src/com/android/messaging/sms/MmsSender.java b/src/com/android/messaging/sms/MmsSender.java
index b881a7f..b8da483 100644
--- a/src/com/android/messaging/sms/MmsSender.java
+++ b/src/com/android/messaging/sms/MmsSender.java
@@ -1,5 +1,6 @@
 /*
  * Copyright (C) 2015 The Android Open Source Project
+ * Copyright (C) 2024 The LineageOS Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -163,7 +164,7 @@ public class MmsSender {
                 context,
                 0 /*request code*/,
                 sentIntent,
-                PendingIntent.FLAG_UPDATE_CURRENT);
+                PendingIntent.FLAG_UPDATE_CURRENT | PendingIntent.FLAG_IMMUTABLE);
 
         // Send the message
         MmsManager.sendMultimediaMessage(subId, context, contentUri, locationUrl,
@@ -262,7 +263,7 @@ public class MmsSender {
                 context,
                 0 /*request code*/,
                 downloadedIntent,
-                PendingIntent.FLAG_UPDATE_CURRENT);
+                PendingIntent.FLAG_UPDATE_CURRENT | PendingIntent.FLAG_IMMUTABLE);
 
         MmsManager.downloadMultimediaMessage(subId, context, contentLocation, contentUri,
                 downloadedPendingIntent);
diff --git a/src/com/android/messaging/sms/SmsSender.java b/src/com/android/messaging/sms/SmsSender.java
index e429995..bd3add7 100644
--- a/src/com/android/messaging/sms/SmsSender.java
+++ b/src/com/android/messaging/sms/SmsSender.java
@@ -1,5 +1,6 @@
 /*
  * Copyright (C) 2015 The Android Open Source Project
+ * Copyright (C) 2024 The LineageOS Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -267,7 +268,7 @@ public class SmsSender {
                         partId,
                         getSendStatusIntent(context, SendStatusReceiver.MESSAGE_DELIVERED_ACTION,
                                 messageUri, partId, subId),
-                        0/*flag*/));
+                        PendingIntent.FLAG_IMMUTABLE));
             } else {
                 deliveryIntents.add(null);
             }
@@ -276,7 +277,7 @@ public class SmsSender {
                     partId,
                     getSendStatusIntent(context, SendStatusReceiver.MESSAGE_SENT_ACTION,
                             messageUri, partId, subId),
-                    0/*flag*/));
+                    PendingIntent.FLAG_IMMUTABLE));
         }
         try {
             if (MmsConfig.get(subId).getSendMultipartSmsAsSeparateMessages()) {
diff --git a/src/com/android/messaging/ui/UIIntentsImpl.java b/src/com/android/messaging/ui/UIIntentsImpl.java
index c38b0cb..33dc19a 100644
--- a/src/com/android/messaging/ui/UIIntentsImpl.java
+++ b/src/com/android/messaging/ui/UIIntentsImpl.java
@@ -1,5 +1,6 @@
 /*
  * Copyright (C) 2015 The Android Open Source Project
+ * Copyright (C) 2024 The LineageOS Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -428,7 +429,7 @@ public class UIIntentsImpl extends UIIntents {
         }
         return PendingIntent.getBroadcast(context,
                 requestCode, intent,
-                PendingIntent.FLAG_UPDATE_CURRENT);
+                PendingIntent.FLAG_UPDATE_CURRENT | PendingIntent.FLAG_MUTABLE);
     }
 
     /**
@@ -446,7 +447,8 @@ public class UIIntentsImpl extends UIIntents {
         // Adds the back stack for the Intent (plus the Intent itself)
         stackBuilder.addNextIntentWithParentStack(intent);
         final PendingIntent resultPendingIntent =
-            stackBuilder.getPendingIntent(requestCode, PendingIntent.FLAG_UPDATE_CURRENT);
+            stackBuilder.getPendingIntent(requestCode,
+                    PendingIntent.FLAG_UPDATE_CURRENT | PendingIntent.FLAG_MUTABLE);
         return resultPendingIntent;
     }