diff --git a/README.html b/README.html
index 2e835bb..fbe5c7b 100644
--- a/README.html
+++ b/README.html
@@ -3,7 +3,7 @@
 <p>Highlights:</p>
 <ul>
 <li>GPLv3, open source.</li>
-<li>Support for both AirPlay Mirror and AirPlay Audio-only (Apple Lossless ALAC) protocols from current iOS/iPadOS 15.2 client devices.</li>
+<li>Support for both AirPlay Mirror and AirPlay Audio-only (Apple Lossless ALAC) protocols from current iOS/iPadOS 15.4 client devices.</li>
 <li>macOS computers (2011 or later) can act either as AirPlay clients, or as the server running UxPlay (tested on macOS 10.15 Catalina and 12.3 Monterey). Using AirPlay, UxPlay can emulate a second display for macOS clients. Both Intel and “Apple Silicon” M1 Macs are now fully supported in both roles.</li>
 <li>Support for older 32-bit iOS clients (such as iPad 2nd gen, iPhone 4S, when upgraded to iOS 9.3.5 or later), and a Windows AirPlay-client emulator, AirMyPC.</li>
 <li>Uses GStreamer, with options to select different output “videosinks” and “audiosinks”.</li>
diff --git a/README.md b/README.md
index 6874b7b..b5d57e2 100644
--- a/README.md
+++ b/README.md
@@ -7,7 +7,7 @@ Highlights:
 
    * GPLv3, open source.
    * Support for both AirPlay Mirror and AirPlay Audio-only (Apple Lossless ALAC) protocols 
-     from current iOS/iPadOS 15.2 client devices.
+     from current iOS/iPadOS 15.4 client devices.
    * macOS computers (2011 or later) can act either as AirPlay clients, or as the server running UxPlay (tested
      on macOS 10.15 Catalina and 12.3 Monterey).  Using AirPlay, UxPlay can emulate a second display for macOS clients.
      Both Intel and "Apple Silicon"  M1 Macs are now fully supported in both roles.
diff --git a/README.txt b/README.txt
index 15b69d6..9ecdd30 100644
--- a/README.txt
+++ b/README.txt
@@ -7,7 +7,7 @@ Highlights:
 
 -   GPLv3, open source.
 -   Support for both AirPlay Mirror and AirPlay Audio-only (Apple
-    Lossless ALAC) protocols from current iOS/iPadOS 15.2 client
+    Lossless ALAC) protocols from current iOS/iPadOS 15.4 client
     devices.
 -   macOS computers (2011 or later) can act either as AirPlay clients,
     or as the server running UxPlay (tested on macOS 10.15 Catalina and