diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,3 +1,7 @@
+## 5.0.1
+
+* Allowing bytestring 0.12.
+
 ## 5.0.0
 
 * Using the network-control package.
diff --git a/Network/HTTP2/Client/Run.hs b/Network/HTTP2/Client/Run.hs
--- a/Network/HTTP2/Client/Run.hs
+++ b/Network/HTTP2/Client/Run.hs
@@ -37,6 +37,18 @@
 
 -- | The default client config.
 --
+-- The @authority@ field will be used to set the HTTP2 @:authority@
+-- pseudo-header. In most cases you will want to override it to be equal to
+-- @host@.
+--
+-- Further background on @authority@:
+-- [RFC 3986](https://datatracker.ietf.org/doc/html/rfc3986#section-3.2) also
+-- allows @host:port@, and most servers will accept this too. However, when
+-- using TLS, many servers will expect the TLS SNI server name and the
+-- @:authority@ pseudo-header to be equal, and for TLS SNI the server name
+-- should not include the port. Note that HTTP2 explicitly /disallows/ using
+-- @userinfo\@@ as part of the authority.
+--
 -- >>> defaultClientConfig
 -- ClientConfig {scheme = "http", authority = "localhost", cacheLimit = 64, connectionWindowSize = 1048576, settings = Settings {headerTableSize = 4096, enablePush = True, maxConcurrentStreams = Just 64, initialWindowSize = 262144, maxFrameSize = 16384, maxHeaderListSize = Nothing}}
 defaultClientConfig :: ClientConfig
diff --git a/http2.cabal b/http2.cabal
--- a/http2.cabal
+++ b/http2.cabal
@@ -1,6 +1,6 @@
 cabal-version:      >=1.10
 name:               http2
-version:            5.0.0
+version:            5.0.1
 license:            BSD3
 license-file:       LICENSE
 maintainer:         Kazu Yamamoto <kazu@iij.ad.jp>
@@ -117,7 +117,7 @@
         base >=4.9 && <5,
         array >= 0.5 && < 0.6,
         async >= 2.2 && < 2.3,
-        bytestring >= 0.10 && < 0.12,
+        bytestring >= 0.10 && < 0.13,
         containers >= 0.6 && < 0.7,
         stm >= 2.5 && < 2.6,
         case-insensitive >= 1.2 && < 1.3,