diff --git a/README.rst b/README.rst
index 097c2c5e..59e1a98c 100644
--- a/README.rst
+++ b/README.rst
@@ -24,12 +24,12 @@ ngtcp2, nghttp3 and my patched OpenSSL.
 https://github.com/ngtcp2/ngtcp2/tree/draft-22#build-from-git
 describes how to build these three software.
 
-To run h2load against HTTP/3 server, specify h3-22 ALPN with
+To run h2load against HTTP/3 server, specify h3-23 ALPN with
 ``--npn-list`` option like so:
 
 .. code-block:: text
 
-    $ h2load --npn-list h3-22 https://127.0.0.1:4433
+    $ h2load --npn-list h3-23 https://127.0.0.1:4433
 
 You can use Dockerfile to skip the tedious build steps to manually
 pull and build dependencies.  In order to build Docker image, do this:
@@ -43,7 +43,7 @@ Run h2load:
 
 .. code-block:: text
 
-    $ docker run --rm -it --network=host nghttp2-quic /usr/local/bin/h2load --npn-list h3-22 https://127.0.0.1:4433
+    $ docker run --rm -it --network=host nghttp2-quic /usr/local/bin/h2load --npn-list h3-23 https://127.0.0.1:4433
 
 Development Status
 ------------------