diff --git a/tests/protocols/test_http.py b/tests/protocols/test_http.py
index 826f05fdc..b784c5e9b 100644
--- a/tests/protocols/test_http.py
+++ b/tests/protocols/test_http.py
@@ -710,8 +710,8 @@ async def asgi(receive, send):
 
 
 asgi_scope_data = [
-    (asgi3app, {"version": "3.0", "spec_version": "2.1"}),
-    (asgi2app, {"version": "2.0", "spec_version": "2.1"}),
+    (asgi3app, {"version": "3.0", "spec_version": "2.3"}),
+    (asgi2app, {"version": "2.0", "spec_version": "2.3"}),
 ]
 
 
diff --git a/uvicorn/protocols/http/h11_impl.py b/uvicorn/protocols/http/h11_impl.py
index 04b997ffe..76af34393 100644
--- a/uvicorn/protocols/http/h11_impl.py
+++ b/uvicorn/protocols/http/h11_impl.py
@@ -159,7 +159,7 @@ def handle_events(self):
                     "type": "http",
                     "asgi": {
                         "version": self.config.asgi_version,
-                        "spec_version": "2.1",
+                        "spec_version": "2.3",
                     },
                     "http_version": event.http_version.decode("ascii"),
                     "server": self.server,
diff --git a/uvicorn/protocols/http/httptools_impl.py b/uvicorn/protocols/http/httptools_impl.py
index 33e21dc3b..34f66c97c 100644
--- a/uvicorn/protocols/http/httptools_impl.py
+++ b/uvicorn/protocols/http/httptools_impl.py
@@ -201,7 +201,7 @@ def on_url(self, url):
         self.headers = []
         self.scope = {
             "type": "http",
-            "asgi": {"version": self.config.asgi_version, "spec_version": "2.1"},
+            "asgi": {"version": self.config.asgi_version, "spec_version": "2.3"},
             "http_version": "1.1",
             "server": self.server,
             "client": self.client,
diff --git a/uvicorn/protocols/websockets/websockets_impl.py b/uvicorn/protocols/websockets/websockets_impl.py
index 95875b1e3..dedc2dd10 100644
--- a/uvicorn/protocols/websockets/websockets_impl.py
+++ b/uvicorn/protocols/websockets/websockets_impl.py
@@ -132,7 +132,7 @@ async def process_request(self, path, headers):
 
         self.scope = {
             "type": "websocket",
-            "asgi": {"version": self.config.asgi_version, "spec_version": "2.1"},
+            "asgi": {"version": self.config.asgi_version, "spec_version": "2.3"},
             "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 bf4c90441..85fa58899 100644
--- a/uvicorn/protocols/websockets/wsproto_impl.py
+++ b/uvicorn/protocols/websockets/wsproto_impl.py
@@ -146,7 +146,7 @@ def handle_connect(self, event):
         raw_path, _, query_string = event.target.partition("?")
         self.scope = {
             "type": "websocket",
-            "asgi": {"version": self.config.asgi_version, "spec_version": "2.1"},
+            "asgi": {"version": self.config.asgi_version, "spec_version": "2.3"},
             "http_version": "1.1",
             "scheme": self.scheme,
             "server": self.server,