diff --git a/uvicorn/protocols/websockets/websockets_impl.py b/uvicorn/protocols/websockets/websockets_impl.py
index 0c015991a..9aab66759 100644
--- a/uvicorn/protocols/websockets/websockets_impl.py
+++ b/uvicorn/protocols/websockets/websockets_impl.py
@@ -191,7 +191,7 @@ async def process_request(
 
         self.scope = {
             "type": "websocket",
-            "asgi": {"version": self.config.asgi_version, "spec_version": "2.3"},
+            "asgi": {"version": self.config.asgi_version, "spec_version": "2.4"},
             "http_version": "1.1",
             "scheme": self.scheme,
             "server": self.server,
diff --git a/uvicorn/protocols/websockets/wsproto_impl.py b/uvicorn/protocols/websockets/wsproto_impl.py
index a9bcf7879..85880a408 100644
--- a/uvicorn/protocols/websockets/wsproto_impl.py
+++ b/uvicorn/protocols/websockets/wsproto_impl.py
@@ -170,7 +170,7 @@ def handle_connect(self, event: events.Request) -> None:
         full_raw_path = self.root_path.encode("ascii") + raw_path.encode("ascii")
         self.scope: "WebSocketScope" = {
             "type": "websocket",
-            "asgi": {"version": self.config.asgi_version, "spec_version": "2.3"},
+            "asgi": {"version": self.config.asgi_version, "spec_version": "2.4"},
             "http_version": "1.1",
             "scheme": self.scheme,
             "server": self.server,