diff --git a/README.md b/README.md
index c58d6dd..9a0902e 100644
--- a/README.md
+++ b/README.md
@@ -16,9 +16,8 @@
 
 ProtonVPN-CLI is a full rewrite of the [bash protonvpn-cli](https://github.com/ProtonVPN/protonvpn-cli/blob/master/protonvpn-cli.sh) in Python, which adds more features and functionality with the purpose of improving readability, speed and reliability.
 
-## Important information
-The [official ProtonVPN Linux](https://protonvpn.com/blog/protonvpn-linux-app/) app is available for Debian 10, Ubuntu 20+, Mint 19+, MX Linux 19+, Fedora 31+ and Archlinux / Manjaro. Where possible, we recommend that you [upgrade to the official app](https://protonvpn.com/support/linux-vpn-setup/).
-The community Linux client described below remains available for those who need it.
+## Deprecation notice
+Proton VPN is upgrading its OpenVPN infrastructure. This means the legacy OpenVPN configuration will stop working on 31 March 2025. After this date, you’ll need to switch to the [official Proton VPN for Linux app](https://protonvpn.com/support/linux-vpn-setup/), or reconfigure [OpenVPN](https://protonvpn.com/support/vpn-config-download/) or [WireGuard](https://protonvpn.com/support/wireguard-configurations/) manually.
 
 ## Installation & Updating
 
diff --git a/protonvpn_cli/cli.py b/protonvpn_cli/cli.py
index 3a050fa..6e1bf4c 100644
--- a/protonvpn_cli/cli.py
+++ b/protonvpn_cli/cli.py
@@ -65,6 +65,21 @@
                     get_config_value, is_valid_ip, pull_server_data,
                     set_config_value, wait_for_network)
 
+DEPRECATION_NOTICE = """
+/******************************************DEPRECATION NOTICE********************************************/
+/*                                                                                                      */
+/*          Proton VPN is upgrading its OpenVPN infrastructure.                                         */
+/*          This means the legacy OpenVPN configuration will stop working on 31 March 2025.             */
+/*          After this date, you’ll need to switch to the official Proton VPN for Linux app,            */
+/*          or reconfigure OpenVPN or WireGuard manually.                                               */
+/*          See:                                                                                        */
+/*          - Official app: https://protonvpn.com/support/linux-vpn-setup/                              */
+/*          - WireGuard: https://protonvpn.com/support/wireguard-configurations/                        */
+/*          - OpenVPN: https://protonvpn.com/support/vpn-config-download/                               */
+/*                                                                                                      */
+/********************************************************************************************************/
+"""
+
 
 def main():
     """Main function"""
@@ -78,11 +93,7 @@ def main():
 def cli():
     """Run user's input command."""
 
-    if shutil.which("NetworkManager") or shutil.which("nmcli"):
-        print(
-            "\nProtonVPN now offers an official Linux app which includes a graphical user interface.\n"
-            "Visit https://protonvpn.com/support/official-linux-client to upgrade."
-        )
+    print(DEPRECATION_NOTICE)
 
     # Initial log values
     change_file_owner(os.path.join(CONFIG_DIR, "pvpn-cli.log"))