diff --git a/README.md b/README.md
index bd5a91e..7f83604 100644
--- a/README.md
+++ b/README.md
@@ -6,6 +6,12 @@
 [![image](https://img.shields.io/pypi/pyversions/ruff-lsp.svg)](https://pypi.python.org/pypi/ruff-lsp)
 [![Actions status](https://github.com/astral-sh/ruff-lsp/workflows/CI/badge.svg)](https://github.com/astral-sh/ruff-lsp/actions)
 
+> [!WARNING]
+>
+> **`ruff-lsp` is deprecated. Please switch to the native server (`ruff server`).
+> Refer to the [migration guide](https://docs.astral.sh/ruff/editors/migration/) and
+> [setup guide](https://docs.astral.sh/ruff/editors/setup/) for more details.**
+
 > [!NOTE]
 >
 > **As of Ruff v0.4.5, Ruff ships with a built-in language server written in Rust: ⚡ `ruff server` ⚡**
diff --git a/ruff_lsp/server.py b/ruff_lsp/server.py
index 5e69051..84587fc 100755
--- a/ruff_lsp/server.py
+++ b/ruff_lsp/server.py
@@ -1570,6 +1570,13 @@ async def run_path(
 @LSP_SERVER.feature(INITIALIZE)
 def initialize(params: InitializeParams) -> None:
     """LSP handler for initialize request."""
+    log_warning(
+        "ruff-lsp is deprecated. Please switch to the native server "
+        "(`ruff server`). Refer to the "
+        "[migration guide](https://docs.astral.sh/ruff/editors/migration/) and "
+        "[setup guide](https://docs.astral.sh/ruff/editors/setup/) for more details."
+    )
+
     # Extract client capabilities.
     CLIENT_CAPABILITIES[CODE_ACTION_RESOLVE] = _supports_code_action_resolve(
         params.capabilities
@@ -1996,6 +2003,12 @@ def show_error(message: str) -> None:
     LSP_SERVER.show_message(message, MessageType.Error)
 
 
+def show_warning(message: str) -> None:
+    """Show a pop-up with a warning."""
+    LSP_SERVER.show_message_log(message, MessageType.Warning)
+    LSP_SERVER.show_message(message, MessageType.Error)
+
+
 def log_warning(message: str) -> None:
     LSP_SERVER.show_message_log(message, MessageType.Warning)
     if os.getenv("LS_SHOW_NOTIFICATION", "off") in ["onWarning", "always"]: