diff --git a/README.md b/README.md
index 2c6ca8a63..33214257f 100644
--- a/README.md
+++ b/README.md
@@ -49,6 +49,16 @@ $ S3_GW_PEERS_0_ADDRESS=192.168.130.72:8080 \
   S3_GW_AUTH-KEY=a04edd5b3c497eed83be25fb136bafd056928c17986440745775223615f2cbab \
   neofs-s3-gw
 ```
+It's also possible to specify uri scheme (grpc or grpcs) when using `-p` or environment variables:
+```
+$ neofs-s3-gw -p grpc://192.168.130.72:8080 --neofs-key KxDgvEKzgSBPPfuVfw67oPQBSjidEiqTHURKSDL1R7yGaGYAeYnr \
+  --auth-key a04edd5b3c497eed83be25fb136bafd056928c17986440745775223615f2cbab
+
+$ S3_GW_PEERS_0_ADDRESS=grpcs://192.168.130.72:8080 \
+  S3_GW_NEOFS-KEY=KxDgvEKzgSBPPfuVfw67oPQBSjidEiqTHURKSDL1R7yGaGYAeYnr \
+  S3_GW_AUTH-KEY=a04edd5b3c497eed83be25fb136bafd056928c17986440745775223615f2cbab \
+  neofs-s3-gw
+```
 
 ## Configuration
 
diff --git a/cmd/s3-gw/app-settings.go b/cmd/s3-gw/app-settings.go
index 50873f01e..4ae6af3a6 100644
--- a/cmd/s3-gw/app-settings.go
+++ b/cmd/s3-gw/app-settings.go
@@ -45,11 +45,6 @@ const ( // Settings.
 	cfgLoggerSamplingInitial    = "logger.sampling.initial"
 	cfgLoggerSamplingThereafter = "logger.sampling.thereafter"
 
-	// KeepAlive.
-	cfgKeepaliveTime                = "keepalive.time"
-	cfgKeepaliveTimeout             = "keepalive.timeout"
-	cfgKeepalivePermitWithoutStream = "keepalive.permit_without_stream"
-
 	// Keys.
 	cfgNeoFSPrivateKey    = "neofs-key"
 	cfgGateAuthPrivateKey = "auth-key"
@@ -206,12 +201,6 @@ func newSettings() *viper.Viper {
 	v.SetDefault(cfgLoggerSamplingInitial, 1000)
 	v.SetDefault(cfgLoggerSamplingThereafter, 1000)
 
-	// keepalive:
-	// If set below 10s, a minimum value of 10s will be used instead.
-	v.SetDefault(cfgKeepaliveTime, defaultKeepaliveTime)
-	v.SetDefault(cfgKeepaliveTimeout, defaultKeepaliveTimeout)
-	v.SetDefault(cfgKeepalivePermitWithoutStream, true)
-
 	if err := v.BindPFlags(flags); err != nil {
 		panic(err)
 	}
diff --git a/cmd/s3-gw/app.go b/cmd/s3-gw/app.go
index cd1e4c7d9..f5e848dc1 100644
--- a/cmd/s3-gw/app.go
+++ b/cmd/s3-gw/app.go
@@ -111,9 +111,6 @@ func newApp(ctx context.Context, l *zap.Logger, v *viper.Viper) *App {
 		NodeRequestTimeout:      reqTimeout,
 		ClientRebalanceInterval: reBalance,
 		SessionExpirationEpoch:  math.MaxUint64,
-		KeepaliveTime:           v.GetDuration(cfgKeepaliveTime),
-		KeepaliveTimeout:        v.GetDuration(cfgKeepaliveTimeout),
-		KeepalivePermitWoStream: v.GetBool(cfgKeepalivePermitWithoutStream),
 	}
 	conns, err = poolPeers.Build(ctx, opts)
 	if err != nil {
diff --git a/go.mod b/go.mod
index 2f1ee8eb5..6e9f1a9d9 100644
--- a/go.mod
+++ b/go.mod
@@ -9,7 +9,7 @@ require (
 	github.com/nspcc-dev/neofs-api-go v1.27.0
 	github.com/nspcc-dev/neofs-crypto v0.3.0
 	github.com/nspcc-dev/neofs-node v1.22.0
-	github.com/nspcc-dev/neofs-sdk-go v0.0.0-20210604112451-f16d38c7b92a
+	github.com/nspcc-dev/neofs-sdk-go v0.0.0-20210609143631-0d3c078a0d9b
 	github.com/prometheus/client_golang v1.9.0
 	github.com/spf13/pflag v1.0.5
 	github.com/spf13/viper v1.7.1
diff --git a/go.sum b/go.sum
index 2f36ff384..d797c816e 100644
--- a/go.sum
+++ b/go.sum
@@ -344,6 +344,8 @@ github.com/nspcc-dev/neofs-node v1.22.0 h1:TJ4d5zopItYYWMEajegVWBgAw8HjZFe12IkNm
 github.com/nspcc-dev/neofs-node v1.22.0/go.mod h1:ecpXrzIe1vcp5FBjPsIaHKVIVvxsv4GVBCw21WYcY3c=
 github.com/nspcc-dev/neofs-sdk-go v0.0.0-20210604112451-f16d38c7b92a h1:bVvyR+Y+UmElTFKY0ifjtvWteYSm93jihKV1rh4wW5s=
 github.com/nspcc-dev/neofs-sdk-go v0.0.0-20210604112451-f16d38c7b92a/go.mod h1:1djNrOkpTTbNUlJM/MvTmohJUaWKUMy9JHSCCA8rJEc=
+github.com/nspcc-dev/neofs-sdk-go v0.0.0-20210609143631-0d3c078a0d9b h1:2alc6tGPHScEATOxlrYuHCTl+DbhVaqigT5Bo1QXY90=
+github.com/nspcc-dev/neofs-sdk-go v0.0.0-20210609143631-0d3c078a0d9b/go.mod h1:1djNrOkpTTbNUlJM/MvTmohJUaWKUMy9JHSCCA8rJEc=
 github.com/nspcc-dev/rfc6979 v0.1.0/go.mod h1:exhIh1PdpDC5vQmyEsGvc4YDM/lyQp/452QxGq/UEso=
 github.com/nspcc-dev/rfc6979 v0.2.0 h1:3e1WNxrN60/6N0DW7+UYisLeZJyfqZTNOjeV/toYvOE=
 github.com/nspcc-dev/rfc6979 v0.2.0/go.mod h1:exhIh1PdpDC5vQmyEsGvc4YDM/lyQp/452QxGq/UEso=