diff --git a/app/src/main/java/io/heckel/ntfy/db/Repository.kt b/app/src/main/java/io/heckel/ntfy/db/Repository.kt
index fada7d2..822f711 100644
--- a/app/src/main/java/io/heckel/ntfy/db/Repository.kt
+++ b/app/src/main/java/io/heckel/ntfy/db/Repository.kt
@@ -301,6 +301,16 @@ class Repository(private val sharedPrefs: SharedPreferences, private val databas
             .apply()
     }
 
+    fun getJsonStreamRemindTime(): Long {
+        return sharedPrefs.getLong(SHARED_PREFS_JSON_STREAM_REMIND_TIME, JSON_STREAM_REMIND_TIME_ALWAYS)
+    }
+
+    fun setJsonStreamRemindTime(timeMillis: Long) {
+        sharedPrefs.edit()
+            .putLong(SHARED_PREFS_JSON_STREAM_REMIND_TIME, timeMillis)
+            .apply()
+    }
+
     fun getDefaultBaseUrl(): String? {
         return sharedPrefs.getString(SHARED_PREFS_DEFAULT_BASE_URL, null) ?:
             sharedPrefs.getString(SHARED_PREFS_UNIFIED_PUSH_BASE_URL, null) // Fall back to UP URL, removed when default is set!
@@ -434,6 +444,7 @@ class Repository(private val sharedPrefs: SharedPreferences, private val databas
         const val SHARED_PREFS_BROADCAST_ENABLED = "BroadcastEnabled"
         const val SHARED_PREFS_RECORD_LOGS_ENABLED = "RecordLogs"
         const val SHARED_PREFS_BATTERY_OPTIMIZATIONS_REMIND_TIME = "BatteryOptimizationsRemindTime"
+        const val SHARED_PREFS_JSON_STREAM_REMIND_TIME = "JsonStreamRemindTime" // Deprecation of JSON stream
         const val SHARED_PREFS_UNIFIED_PUSH_BASE_URL = "UnifiedPushBaseURL" // Legacy key required for migration to DefaultBaseURL
         const val SHARED_PREFS_DEFAULT_BASE_URL = "DefaultBaseURL"
         const val SHARED_PREFS_LAST_TOPICS = "LastTopics"
@@ -464,6 +475,9 @@ class Repository(private val sharedPrefs: SharedPreferences, private val databas
         const val BATTERY_OPTIMIZATIONS_REMIND_TIME_ALWAYS = 1L
         const val BATTERY_OPTIMIZATIONS_REMIND_TIME_NEVER = Long.MAX_VALUE
 
+        const val JSON_STREAM_REMIND_TIME_ALWAYS = 1L
+        const val JSON_STREAM_REMIND_TIME_NEVER = Long.MAX_VALUE
+
         private const val TAG = "NtfyRepository"
         private var instance: Repository? = null
 
diff --git a/app/src/main/java/io/heckel/ntfy/ui/MainActivity.kt b/app/src/main/java/io/heckel/ntfy/ui/MainActivity.kt
index 6216d46..6d8db1d 100644
--- a/app/src/main/java/io/heckel/ntfy/ui/MainActivity.kt
+++ b/app/src/main/java/io/heckel/ntfy/ui/MainActivity.kt
@@ -119,8 +119,9 @@ class MainActivity : AppCompatActivity(), ActionMode.Callback, AddFragment.Subsc
                     Log.addScrubTerm(s.topic)
                 }
 
-                // Update battery banner
+                // Update banner + JSON stream banner
                 showHideBatteryBanner(subscriptions)
+                showHideJsonStreamBanner(subscriptions)
             }
         }
 
@@ -168,6 +169,23 @@ class MainActivity : AppCompatActivity(), ActionMode.Callback, AddFragment.Subsc
             }
         }
 
+        // JSON stream banner
+        val jsonStreamBanner = findViewById<View>(R.id.main_banner_json_stream) // Banner visibility is toggled in onResume()
+        val jsonStreamDismissButton = findViewById<Button>(R.id.main_banner_json_stream_dontaskagain)
+        val jsonStreamRemindButton = findViewById<Button>(R.id.main_banner_json_stream_remind_later)
+        val jsonStreamLearnMoreButton = findViewById<Button>(R.id.main_banner_json_stream_learn_mode)
+        jsonStreamDismissButton.setOnClickListener {
+            jsonStreamBanner.visibility = View.GONE
+            repository.setJsonStreamRemindTime(Repository.JSON_STREAM_REMIND_TIME_NEVER)
+        }
+        jsonStreamRemindButton.setOnClickListener {
+            jsonStreamBanner.visibility = View.GONE
+            repository.setJsonStreamRemindTime(System.currentTimeMillis() + ONE_DAY_MILLIS)
+        }
+        jsonStreamLearnMoreButton.setOnClickListener {
+            startActivity(Intent(Intent.ACTION_VIEW, Uri.parse(getString(R.string.main_banner_json_stream_button_learn_more_url))))
+        }
+
         // Create notification channels right away, so we can configure them immediately after installing the app
         dispatcher?.init()
 
@@ -199,6 +217,15 @@ class MainActivity : AppCompatActivity(), ActionMode.Callback, AddFragment.Subsc
         Log.d(TAG, "Battery: ignoring optimizations = $ignoringOptimizations (we want this to be true); instant subscriptions = $hasInstantSubscriptions; remind time reached = $batteryRemindTimeReached; banner = $showBanner")
     }
 
+    private fun showHideJsonStreamBanner(subscriptions: List<Subscription>) {
+        val hasSelfhostedSubscriptions = subscriptions.count { it.baseUrl != appBaseUrl } > 0
+        val usingWebSockets = repository.getConnectionProtocol() == Repository.CONNECTION_PROTOCOL_WS
+        val jsonStreamRemindTimeReached = repository.getJsonStreamRemindTime() < System.currentTimeMillis()
+        val showBanner = hasSelfhostedSubscriptions && jsonStreamRemindTimeReached && !usingWebSockets
+        val jsonStreamBanner = findViewById<View>(R.id.main_banner_json_stream)
+        jsonStreamBanner.visibility = if (showBanner) View.VISIBLE else View.GONE
+    }
+
     private fun schedulePeriodicPollWorker() {
         val workerVersion = repository.getPollWorkerVersion()
         val workPolicy = if (workerVersion == PollWorker.VERSION) {
diff --git a/app/src/main/res/drawable/ic_announcement_orange_24dp.xml b/app/src/main/res/drawable/ic_announcement_orange_24dp.xml
new file mode 100644
index 0000000..559fe0a
--- /dev/null
+++ b/app/src/main/res/drawable/ic_announcement_orange_24dp.xml
@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+  <path
+      android:pathData="M20,2L4,2c-1.1,0 -2,0.9 -2,2v18l4,-4h14c1.1,0 2,-0.9 2,-2L22,4c0,-1.1 -0.9,-2 -2,-2zM20,16L5.17,16L4,17.17L4,4h16v12zM11,5h2v6h-2zM11,13h2v2h-2z"
+      android:fillColor="#FF9800"/>
+</vector>
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index e825332..d9c30fe 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
                                                    xmlns:app="http://schemas.android.com/apk/res-auto"
-                                                   android:layout_width="match_parent"
+                                                   xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
                                                    android:layout_height="match_parent">
 
     <com.google.android.material.card.MaterialCardView
@@ -44,7 +44,7 @@
                     android:layout_height="wrap_content"
                     android:layout_marginTop="5dp"
                     android:layout_marginEnd="5dp"
-                    android:text="@string/main_banner_battery_button_ask_later"
+                    android:text="@string/main_banner_battery_button_remind_later"
                     app:layout_constraintBottom_toBottomOf="parent"
                     app:layout_constraintEnd_toStartOf="@id/main_banner_battery_fix_now"
                     app:layout_constraintTop_toBottomOf="@+id/main_banner_battery_text"
@@ -77,6 +77,77 @@
         </androidx.constraintlayout.widget.ConstraintLayout>
     </com.google.android.material.card.MaterialCardView>
 
+    <com.google.android.material.card.MaterialCardView
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            app:shapeAppearance="?shapeAppearanceLargeComponent" app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintEnd_toEndOf="parent" app:layout_constraintTop_toBottomOf="@+id/main_banner_battery"
+            android:id="@+id/main_banner_json_stream" android:visibility="visible">
+
+        <androidx.constraintlayout.widget.ConstraintLayout
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:id="@+id/main_banner_json_stream_constraint" android:elevation="5dp">
+
+            <ImageView
+                    android:layout_width="28dp"
+                    android:layout_height="28dp" app:srcCompat="@drawable/ic_announcement_orange_24dp"
+                    android:id="@+id/main_banner_json_stream_image"
+                    app:layout_constraintStart_toStartOf="parent"
+                    app:layout_constraintTop_toTopOf="@+id/main_banner_json_stream_text"
+                    app:layout_constraintEnd_toStartOf="@id/main_banner_json_stream_text"
+                    app:layout_constraintBottom_toBottomOf="@+id/main_banner_json_stream_text"
+                    android:layout_marginStart="15dp"/>
+            <TextView
+                    android:id="@+id/main_banner_json_stream_text"
+                    android:layout_width="0dp"
+                    android:layout_height="wrap_content"
+                    android:text="@string/main_banner_json_stream_text"
+                    android:textAppearance="@style/TextAppearance.AppCompat.Small"
+                    app:layout_constraintEnd_toEndOf="parent"
+                    app:layout_constraintTop_toTopOf="parent"
+                    android:layout_marginEnd="15dp" android:layout_marginTop="15dp"
+                    app:layout_constraintStart_toEndOf="@+id/main_banner_json_stream_image"
+                    android:layout_marginStart="10dp"/>
+
+            <com.google.android.material.button.MaterialButton
+                    android:id="@+id/main_banner_json_stream_remind_later"
+                    style="@style/Widget.MaterialComponents.Button.TextButton"
+                    android:layout_width="0dp"
+                    android:layout_height="wrap_content"
+                    android:layout_marginTop="5dp"
+                    android:text="@string/main_banner_json_stream_button_remind_later"
+                    app:layout_constraintBottom_toBottomOf="parent"
+                    app:layout_constraintTop_toBottomOf="@+id/main_banner_json_stream_text"
+                    android:layout_marginBottom="5dp" app:layout_constraintEnd_toStartOf="@+id/main_banner_json_stream_learn_mode" android:layout_marginEnd="5dp"/>
+
+            <com.google.android.material.button.MaterialButton
+                    android:id="@+id/main_banner_json_stream_dontaskagain"
+                    style="@style/Widget.MaterialComponents.Button.TextButton"
+                    android:layout_width="0dp"
+                    android:layout_height="wrap_content"
+                    android:layout_marginTop="5dp"
+                    android:layout_marginEnd="5dp"
+                    android:text="@string/main_banner_json_stream_button_dismiss"
+                    app:layout_constraintBottom_toBottomOf="parent"
+                    app:layout_constraintEnd_toStartOf="@id/main_banner_json_stream_remind_later"
+                    app:layout_constraintTop_toBottomOf="@+id/main_banner_json_stream_text"
+                    android:layout_marginBottom="5dp"/>
+
+
+            <com.google.android.material.button.MaterialButton
+                    android:id="@+id/main_banner_json_stream_learn_mode"
+                    style="@style/Widget.MaterialComponents.Button.TextButton"
+                    android:layout_width="0dp"
+                    android:layout_height="wrap_content"
+                    android:layout_marginTop="5dp"
+                    android:text="@string/main_banner_json_stream_button_learn_more"
+                    app:layout_constraintBottom_toBottomOf="parent"
+                    app:layout_constraintTop_toBottomOf="@+id/main_banner_json_stream_text"
+                    android:layout_marginBottom="5dp" app:layout_constraintEnd_toEndOf="parent" android:layout_marginEnd="15dp"/>
+        </androidx.constraintlayout.widget.ConstraintLayout>
+    </com.google.android.material.card.MaterialCardView>
+
     <androidx.swiperefreshlayout.widget.SwipeRefreshLayout
             android:id="@+id/main_subscriptions_list_container"
             android:layout_width="match_parent"
@@ -85,7 +156,7 @@
             android:visibility="visible"
             app:layout_constraintStart_toStartOf="parent" app:layout_constraintEnd_toEndOf="parent"
             app:layout_constraintBottom_toBottomOf="parent"
-            app:layout_constraintTop_toBottomOf="@+id/main_banner_battery">
+            app:layout_constraintTop_toBottomOf="@id/main_banner_json_stream">
         <androidx.recyclerview.widget.RecyclerView
                 android:id="@+id/main_subscriptions_list"
                 android:layout_width="match_parent"
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index d502c73..0a3fd0c 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -69,10 +69,17 @@
 
     <!-- Main activity: Battery banner -->
     <string name="main_banner_battery_text">Battery optimization should be disabled to avoid issues with notification delivery.</string>
-    <string name="main_banner_battery_button_ask_later">Ask later</string>
-    <string name="main_banner_battery_button_dismiss">Don\'t ask again</string>
+    <string name="main_banner_battery_button_remind_later">Remind later</string>
+    <string name="main_banner_battery_button_dismiss">Dismiss</string>
     <string name="main_banner_battery_button_fix_now">Fix now</string>
 
+    <!-- Main activity: JSON stream banner -->
+    <string name="main_banner_json_stream_text">Starting June 2022, WebSockets will be used to communicate with the server. Be sure get your selfhosted server ready.</string>
+    <string name="main_banner_json_stream_button_remind_later">Remind later</string>
+    <string name="main_banner_json_stream_button_dismiss">Dismiss</string>
+    <string name="main_banner_json_stream_button_learn_more">Learn more</string>
+    <string name="main_banner_json_stream_button_learn_more_url">https://ntfy.sh/docs/deprecations</string>
+
     <!-- Add dialog -->
     <string name="add_dialog_title">Subscribe to topic</string>
     <string name="add_dialog_description_below">
diff --git a/assets/announcement_black_24dp.svg b/assets/announcement_black_24dp.svg
new file mode 100644
index 0000000..2fbc2e8
--- /dev/null
+++ b/assets/announcement_black_24dp.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" height="24px" viewBox="0 0 24 24" width="24px" fill="#000000"><path d="M0 0h24v24H0V0z" fill="none"/><path d="M20 2H4c-1.1 0-2 .9-2 2v18l4-4h14c1.1 0 2-.9 2-2V4c0-1.1-.9-2-2-2zm0 14H5.17L4 17.17V4h16v12zM11 5h2v6h-2zm0 8h2v2h-2z"/></svg>
\ No newline at end of file