diff --git a/README.rst b/README.rst
index 93a9fe28e968329ef66aaad3809251a984c1dec6..01e43db02f403c34fe4986e5b56b7682cc89ac26 100644
--- a/README.rst
+++ b/README.rst
@@ -19,6 +19,7 @@ only.
 
 For older draft implementations:
 
+- `draft-27 <https://github.com/ngtcp2/ngtcp2/tree/draft-27>`_
 - `draft-25 <https://github.com/ngtcp2/ngtcp2/tree/draft-25>`_
 - `draft-24 <https://github.com/ngtcp2/ngtcp2/tree/draft-24>`_
 - `draft-23 <https://github.com/ngtcp2/ngtcp2/tree/draft-23>`_
@@ -54,14 +55,14 @@ The client and server under examples directory require patched OpenSSL
 as crypto backend:
 
 * Patched OpenSSL
-  (https://github.com/tatsuhiro-t/openssl/tree/OpenSSL_1_1_1g-quic-draft-27)
+  (https://github.com/tatsuhiro-t/openssl/tree/OpenSSL_1_1_1g-quic-draft-28)
 
 Build from git
 --------------
 
 .. code-block:: text
 
-   $ git clone --depth 1 -b OpenSSL_1_1_1g-quic-draft-27 https://github.com/tatsuhiro-t/openssl
+   $ git clone --depth 1 -b OpenSSL_1_1_1g-quic-draft-28 https://github.com/tatsuhiro-t/openssl
    $ cd openssl
    $ # For Linux
    $ ./config enable-tls1_3 --prefix=$PWD/build
diff --git a/ci/build_openssl.sh b/ci/build_openssl.sh
index 04c81a211f949eb628383bda72b07b096e78dc9a..a4939a42286b08921bd63250bd22a61980209193 100755
--- a/ci/build_openssl.sh
+++ b/ci/build_openssl.sh
@@ -2,7 +2,7 @@
 #build last openssl master (for Travis)
 
 cd ..
-git clone --depth 1 -b OpenSSL_1_1_1g-quic-draft-27 https://github.com/tatsuhiro-t/openssl
+git clone --depth 1 -b OpenSSL_1_1_1g-quic-draft-28 https://github.com/tatsuhiro-t/openssl
 cd openssl
 ./config enable-tls1_3 --prefix=$PWD/build
 make -j$(nproc)
diff --git a/lib/includes/ngtcp2/ngtcp2.h b/lib/includes/ngtcp2/ngtcp2.h
index 8a81b3b2675aff9d372538c29639d383396b0c04..f359aef43fdbae33c408cff21082ba1c647fd37a 100644
--- a/lib/includes/ngtcp2/ngtcp2.h
+++ b/lib/includes/ngtcp2/ngtcp2.h
@@ -159,7 +159,7 @@ typedef struct ngtcp2_mem {
 } ngtcp2_mem;
 
 /* NGTCP2_PROTO_VER is the supported QUIC protocol version. */
-#define NGTCP2_PROTO_VER 0xff00001bu
+#define NGTCP2_PROTO_VER 0xff00001cu
 /* NGTCP2_PROTO_VER_MAX is the highest QUIC version the library
    supports. */
 #define NGTCP2_PROTO_VER_MAX NGTCP2_PROTO_VER
@@ -167,7 +167,7 @@ typedef struct ngtcp2_mem {
 /* NGTCP2_ALPN_H3 is a serialized form of HTTP/3 ALPN protocol
    identifier this library supports.  Notice that the first byte is
    the length of the following protocol identifier. */
-#define NGTCP2_ALPN_H3 "\x5h3-27"
+#define NGTCP2_ALPN_H3 "\x5h3-28"
 
 #define NGTCP2_MAX_PKTLEN_IPV4 1252
 #define NGTCP2_MAX_PKTLEN_IPV6 1232