diff --git a/Makefile b/Makefile
index a9791909..1ac7f2cc 100644
--- a/Makefile
+++ b/Makefile
@@ -16,7 +16,7 @@ CT_OPTS += -ct_hooks cowboy_ct_hook [] # -boot start_sasl
 LOCAL_DEPS = crypto
 
 DEPS = cowlib ranch
-dep_cowlib = git https://github.com/ninenines/cowlib webtransport
+dep_cowlib = git https://github.com/ninenines/cowlib master
 dep_ranch = git https://github.com/ninenines/ranch 1.8.1
 
 ifeq ($(COWBOY_QUICER),1)
diff --git a/rebar.config b/rebar.config
index 022127b5..146f88ff 100644
--- a/rebar.config
+++ b/rebar.config
@@ -1,4 +1,4 @@
 {deps, [
-{cowlib,".*",{git,"https://github.com/ninenines/cowlib",{tag,"2.14.0"}}},{ranch,".*",{git,"https://github.com/ninenines/ranch",{tag,"1.8.1"}}}
+{cowlib,".*",{git,"https://github.com/ninenines/cowlib",{branch,"master"}}},{ranch,".*",{git,"https://github.com/ninenines/ranch",{tag,"1.8.1"}}}
 ]}.
 {erl_opts, [debug_info,warn_export_vars,warn_shadow_vars,warn_obsolete_guard,warn_missing_spec,warn_untyped_record]}.
diff --git a/src/cowboy_http2.erl b/src/cowboy_http2.erl
index f4cfa39d..0d22fa10 100644
--- a/src/cowboy_http2.erl
+++ b/src/cowboy_http2.erl
@@ -154,7 +154,8 @@
 }).
 
 -spec init(pid(), ranch:ref(), inet:socket(), module(),
-	ranch_proxy_header:proxy_info() | undefined, cowboy:opts()) -> ok.
+	ranch_proxy_header:proxy_info() | undefined, cowboy:opts()) -> no_return().
+
 init(Parent, Ref, Socket, Transport, ProxyHeader, Opts) ->
 	{ok, Peer} = maybe_socket_error(undefined, Transport:peername(Socket),
 		'A socket error occurred when retrieving the peer name.'),
@@ -178,7 +179,8 @@ init(Parent, Ref, Socket, Transport, ProxyHeader, Opts) ->
 -spec init(pid(), ranch:ref(), inet:socket(), module(),
 	ranch_proxy_header:proxy_info() | undefined, cowboy:opts(),
 	{inet:ip_address(), inet:port_number()}, {inet:ip_address(), inet:port_number()},
-	binary() | undefined, binary()) -> ok.
+	binary() | undefined, binary()) -> no_return().
+
 init(Parent, Ref, Socket, Transport, ProxyHeader, Opts, Peer, Sock, Cert, Buffer) ->
 	DynamicBuffer = init_dynamic_buffer_size(Opts),
 	{ok, Preface, HTTP2Machine} = cow_http2_machine:init(server, Opts),
@@ -227,7 +229,8 @@ add_period(Time, Period) -> Time + Period.
 -spec init(pid(), ranch:ref(), inet:socket(), module(),
 	ranch_proxy_header:proxy_info() | undefined, cowboy:opts(),
 	{inet:ip_address(), inet:port_number()}, {inet:ip_address(), inet:port_number()},
-	binary() | undefined, binary(), map() | undefined, cowboy_req:req()) -> ok.
+	binary() | undefined, binary(), map() | undefined, cowboy_req:req()) -> no_return().
+
 init(Parent, Ref, Socket, Transport, ProxyHeader, Opts, Peer, Sock, Cert, Buffer,
 		_Settings, Req=#{method := Method}) ->
 	DynamicBuffer = init_dynamic_buffer_size(Opts),
@@ -276,7 +279,7 @@ before_loop(State=#state{opts=#{hibernate := true}}, Buffer) ->
 before_loop(State, Buffer) ->
 	loop(State, Buffer).
 
--spec loop(#state{}, binary()) -> ok.
+-spec loop(#state{}, binary()) -> no_return().
 
 loop(State=#state{parent=Parent, socket=Socket, transport=Transport,
 		opts=Opts, timer=TimerRef, children=Children}, Buffer) ->
@@ -1134,7 +1137,9 @@ goaway_streams(State, [Stream|Tail], LastStreamID, Reason, Acc) ->
 %% in-flight stream creation (at least one round-trip time), the server can send
 %% another GOAWAY frame with an updated last stream identifier. This ensures
 %% that a connection can be cleanly shut down without losing requests.
+
 -spec initiate_closing(#state{}, _) -> #state{}.
+
 initiate_closing(State=#state{http2_status=connected, socket=Socket,
 		transport=Transport, opts=Opts}, Reason) ->
 	ok = maybe_socket_error(State, Transport:send(Socket,
@@ -1151,7 +1156,9 @@ initiate_closing(State, Reason) ->
 	terminate(State, {stop, stop_reason(Reason), 'The connection is going away.'}).
 
 %% Switch to 'closing' state and stop accepting new streams.
+
 -spec closing(#state{}, Reason :: term()) -> #state{}.
+
 closing(State=#state{streams=Streams}, Reason) when Streams =:= #{} ->
 	terminate(State, Reason);
 closing(State0=#state{http2_status=closing_initiated,
@@ -1188,6 +1195,7 @@ maybe_socket_error(State, {error, Reason}, Human) ->
 	terminate(State, {socket_error, Reason, Human}).
 
 -spec terminate(#state{} | undefined, _) -> no_return().
+
 terminate(undefined, Reason) ->
 	exit({shutdown, Reason});
 terminate(State=#state{socket=Socket, transport=Transport, http2_status=Status,
@@ -1388,15 +1396,18 @@ terminate_stream_handler(#state{opts=Opts}, StreamID, Reason, StreamState) ->
 
 %% System callbacks.
 
--spec system_continue(_, _, {#state{}, binary()}) -> ok.
+-spec system_continue(_, _, {#state{}, binary()}) -> no_return().
+
 system_continue(_, _, {State, Buffer}) ->
 	before_loop(State, Buffer).
 
 -spec system_terminate(any(), _, _, {#state{}, binary()}) -> no_return().
+
 system_terminate(Reason0, _, _, {State, Buffer}) ->
 	Reason = {stop, {exit, Reason0}, 'sys:terminate/2,3 was called.'},
 	before_loop(initiate_closing(State, Reason), Buffer).
 
 -spec system_code_change(Misc, _, _, _) -> {ok, Misc} when Misc::{#state{}, binary()}.
+
 system_code_change(Misc, _, _, _) ->
 	{ok, Misc}.
diff --git a/test/examples_SUITE.erl b/test/examples_SUITE.erl
index e7e765ef..3d7c48b9 100644
--- a/test/examples_SUITE.erl
+++ b/test/examples_SUITE.erl
@@ -35,10 +35,10 @@ init_per_suite(Config) ->
 	%% reuse the same build across all tests.
 	Make = do_find_make_cmd(),
 	CommonDir = config(priv_dir, Config),
-	ct:log("~s~n", [os:cmd("git clone --depth 1 https://github.com/ninenines/cowboy "
+	ct:log("~ts~n", [os:cmd("git clone --depth 1 https://github.com/ninenines/cowboy "
 		++ CommonDir ++ "cowboy")]),
-	ct:log("~s~n", [os:cmd(Make ++ " -C " ++ CommonDir ++ "cowboy distclean")]),
-	ct:log("~s~n", [os:cmd(Make ++ " -C " ++ CommonDir ++ "cowboy DEPS_DIR=" ++ CommonDir)]),
+	ct:log("~ts~n", [os:cmd(Make ++ " -C " ++ CommonDir ++ "cowboy distclean")]),
+	ct:log("~ts~n", [os:cmd(Make ++ " -C " ++ CommonDir ++ "cowboy DEPS_DIR=" ++ CommonDir)]),
 	Config.
 
 end_per_suite(_) ->
@@ -70,24 +70,24 @@ do_get_paths(Example0) ->
 do_compile_and_start(Example, Config) ->
 	Make = do_find_make_cmd(),
 	{Dir, Rel, _} = do_get_paths(Example),
-	ct:log("~s~n", [os:cmd(Make ++ " -C " ++ Dir ++ " distclean")]),
+	ct:log("~ts~n", [os:cmd(Make ++ " -C " ++ Dir ++ " distclean")]),
 	%% We use a common build for Cowboy, Cowlib and Ranch to speed things up.
 	CommonDir = config(priv_dir, Config),
-	ct:log("~s~n", [os:cmd("mkdir " ++ Dir ++ "/deps")]),
-	ct:log("~s~n", [os:cmd("ln -s " ++ CommonDir ++ "cowboy " ++ Dir ++ "/deps/cowboy")]),
-	ct:log("~s~n", [os:cmd("ln -s " ++ CommonDir ++ "cowlib " ++ Dir ++ "/deps/cowlib")]),
-	ct:log("~s~n", [os:cmd("ln -s " ++ CommonDir ++ "ranch " ++ Dir ++ "/deps/ranch")]),
+	ct:log("~ts~n", [os:cmd("mkdir " ++ Dir ++ "/deps")]),
+	ct:log("~ts~n", [os:cmd("ln -s " ++ CommonDir ++ "cowboy " ++ Dir ++ "/deps/cowboy")]),
+	ct:log("~ts~n", [os:cmd("ln -s " ++ CommonDir ++ "cowlib " ++ Dir ++ "/deps/cowlib")]),
+	ct:log("~ts~n", [os:cmd("ln -s " ++ CommonDir ++ "ranch " ++ Dir ++ "/deps/ranch")]),
 	%% TERM=dumb disables relx coloring.
-	ct:log("~s~n", [os:cmd(Make ++ " -C " ++ Dir ++ " TERM=dumb")]),
-	ct:log("~s~n", [os:cmd(Rel ++ " stop")]),
-	ct:log("~s~n", [os:cmd(Rel ++ " daemon")]),
+	ct:log("~ts~n", [os:cmd(Make ++ " -C " ++ Dir ++ " TERM=dumb")]),
+	ct:log("~ts~n", [os:cmd(Rel ++ " stop")]),
+	ct:log("~ts~n", [os:cmd(Rel ++ " daemon")]),
 	timer:sleep(2000),
 	ok.
 
 do_stop(Example) ->
 	{_, Rel, Log} = do_get_paths(Example),
-	ct:log("~s~n", [os:cmd(Rel ++ " stop")]),
-	ct:log("~s~n", [element(2, file:read_file(Log))]),
+	ct:log("~ts~n", [os:cmd(Rel ++ " stop")]),
+	ct:log("~ts~n", [element(2, file:read_file(Log))]),
 	ok.
 
 %% Fetch a response.