diff --git a/Makefile b/Makefile
index 2930a492..aa686fa4 100644
--- a/Makefile
+++ b/Makefile
@@ -15,7 +15,7 @@ CT_OPTS += -ct_hooks cowboy_ct_hook [] # -boot start_sasl
 LOCAL_DEPS = crypto
 
 DEPS = cowlib ranch
-dep_cowlib = git https://github.com/ninenines/cowlib 2.11.0
+dep_cowlib = git https://github.com/ninenines/cowlib 2.11.1
 dep_ranch = git https://github.com/ninenines/ranch 1.8.0
 
 DOC_DEPS = asciideck
diff --git a/doc/src/guide/migrating_from_2.8.asciidoc b/doc/src/guide/migrating_from_2.8.asciidoc
index a3a0e7c2..d6a213bb 100644
--- a/doc/src/guide/migrating_from_2.8.asciidoc
+++ b/doc/src/guide/migrating_from_2.8.asciidoc
@@ -32,7 +32,7 @@ Cowboy 2.9 requires Erlang/OTP 22.0 or greater.
 
 * Update Ranch to 1.8.0.
 
-* Update Cowlib to 2.11.0.
+* Update Cowlib to 2.11.1.
 
 === Bugs fixed
 
diff --git a/rebar.config b/rebar.config
index 15323433..bbf5ec35 100644
--- a/rebar.config
+++ b/rebar.config
@@ -1,4 +1,4 @@
 {deps, [
-{cowlib,".*",{git,"https://github.com/ninenines/cowlib","2.11.0"}},{ranch,".*",{git,"https://github.com/ninenines/ranch","1.8.0"}}
+{cowlib,".*",{git,"https://github.com/ninenines/cowlib","2.11.1"}},{ranch,".*",{git,"https://github.com/ninenines/ranch","1.8.0"}}
 ]}.
 {erl_opts, [debug_info,warn_export_vars,warn_shadow_vars,warn_obsolete_guard,warn_missing_spec,warn_untyped_record]}.
diff --git a/test/ws_SUITE.erl b/test/ws_SUITE.erl
index 9abeacaa..a4c9c59b 100644
--- a/test/ws_SUITE.erl
+++ b/test/ws_SUITE.erl
@@ -247,6 +247,14 @@ ws_deflate_opts_client_max_window_bits_override(Config) ->
 		= lists:keyfind("sec-websocket-extensions", 1, Headers2),
 	ok.
 
+ws_deflate_opts_client_max_window_bits_only_in_server(Config) ->
+	doc("Handler does not support compression if configured with client "
+		"max window bits less than 15 when client does not provide the option."),
+	{ok, _, Headers} = do_handshake("/ws_deflate_opts?client_max_window_bits",
+		"Sec-WebSocket-Extensions: permessage-deflate\r\n", Config),
+	false = lists:keyfind("sec-websocket-extensions", 1, Headers),
+	ok.
+
 ws_deflate_opts_server_context_takeover(Config) ->
 	doc("Handler is configured with server context takeover enabled."),
 	{ok, _, Headers1} = do_handshake("/ws_deflate_opts?server_context_takeover",