diff --git a/cmd/waku/flags.go b/cmd/waku/flags.go
index 91a82d5c..f87cb31f 100644
--- a/cmd/waku/flags.go
+++ b/cmd/waku/flags.go
@@ -286,6 +286,13 @@ var (
 		Destination: &options.Relay.MinRelayPeersToPublish,
 		EnvVars:     []string{"WAKUNODE2_MIN_RELAY_PEERS_TO_PUBLISH"},
 	})
+	MaxRelayMsgSize = altsrc.NewStringFlag(&cli.StringFlag{
+		Name:        "max-msg-size",
+		Value:       "150KB",
+		Usage:       "Maximum message size. Supported formats are B, KiB, KB, MiB. If no suffix, default is bytes",
+		Destination: &options.Relay.MaxMsgSize,
+		EnvVars:     []string{"WAKUNODE2_MAX_RELAY_MSG_SIZE"},
+	})
 	StoreNodeFlag = cliutils.NewGenericFlagMultiValue(&cli.GenericFlag{
 		Name:  "storenode",
 		Usage: "Multiaddr of a peer that supports store protocol. Option may be repeated",
diff --git a/cmd/waku/main.go b/cmd/waku/main.go
index f868505f..fc733196 100644
--- a/cmd/waku/main.go
+++ b/cmd/waku/main.go
@@ -59,6 +59,7 @@ func main() {
 		ProtectedTopics,
 		RelayPeerExchange,
 		MinRelayPeersToPublish,
+		MaxRelayMsgSize,
 		StoreNodeFlag,
 		StoreFlag,
 		StoreMessageDBURL,
diff --git a/cmd/waku/node.go b/cmd/waku/node.go
index e9d38f16..ef725a1c 100644
--- a/cmd/waku/node.go
+++ b/cmd/waku/node.go
@@ -53,6 +53,8 @@ import (
 	"github.com/waku-org/go-waku/waku/v2/protocol/relay"
 	"github.com/waku-org/go-waku/waku/v2/protocol/store"
 	"github.com/waku-org/go-waku/waku/v2/utils"
+
+	humanize "github.com/dustin/go-humanize"
 )
 
 func requiresDB(options NodeOptions) bool {
@@ -234,10 +236,15 @@ func Execute(options NodeOptions) error {
 	nodeOpts = append(nodeOpts, node.WithLibP2POptions(libp2pOpts...))
 	nodeOpts = append(nodeOpts, node.WithNTP())
 
+	maxMsgSize := parseMsgSizeConfig(options.Relay.MaxMsgSize)
+
 	if options.Relay.Enable {
 		var wakurelayopts []pubsub.Option
 		wakurelayopts = append(wakurelayopts, pubsub.WithPeerExchange(options.Relay.PeerExchange))
+		wakurelayopts = append(wakurelayopts, pubsub.WithMaxMessageSize(maxMsgSize))
+
 		nodeOpts = append(nodeOpts, node.WithWakuRelayAndMinPeers(options.Relay.MinRelayPeersToPublish, wakurelayopts...))
+		nodeOpts = append(nodeOpts, node.WithMaxMsgSize(maxMsgSize))
 	}
 
 	nodeOpts = append(nodeOpts, node.WithWakuFilterLightNode())
@@ -577,3 +584,12 @@ func printListeningAddresses(ctx context.Context, nodeOpts []node.WakuNodeOption
 	}
 
 }
+
+func parseMsgSizeConfig(msgSizeConfig string) int {
+
+	msgSize, err := humanize.ParseBytes(msgSizeConfig)
+	if err != nil {
+		msgSize = 0
+	}
+	return int(msgSize)
+}
diff --git a/cmd/waku/options.go b/cmd/waku/options.go
index ee32bb2d..4031a2f5 100644
--- a/cmd/waku/options.go
+++ b/cmd/waku/options.go
@@ -30,6 +30,7 @@ type RelayOptions struct {
 	ContentTopics          cli.StringSlice
 	PeerExchange           bool
 	MinRelayPeersToPublish int
+	MaxMsgSize             string
 }
 
 // RLNRelayOptions are settings used to enable RLN Relay. This is a protocol
diff --git a/flake.nix b/flake.nix
index dc02d66e..fd85c4ba 100644
--- a/flake.nix
+++ b/flake.nix
@@ -29,7 +29,7 @@
           ];
           doCheck = false;
           # FIXME: This needs to be manually changed when updating modules.
-          vendorSha256 = "sha256-kW9xdZ1JWUWpFVJzSFL3F349pVbtIOQ0Qz1OlbhBzn8=";
+          vendorSha256 = "sha256-+g64LjpSraujzau3d63XMWKed/CnRzL/nxcu0PhyvFw=";
           # Fix for 'nix run' trying to execute 'go-waku'.
           meta = { mainProgram = "waku"; };
         };
diff --git a/go.mod b/go.mod
index b7cd18c1..18f9d78f 100644
--- a/go.mod
+++ b/go.mod
@@ -48,6 +48,7 @@ require (
 	github.com/btcsuite/btcd v0.20.1-beta // indirect
 	github.com/btcsuite/btcutil v0.0.0-20190425235716-9e5f4b9a998d // indirect
 	github.com/deckarep/golang-set v1.8.0 // indirect
+	github.com/dustin/go-humanize v1.0.1 // indirect
 	github.com/fsnotify/fsnotify v1.6.0 // indirect
 	github.com/gogo/protobuf v1.3.2 // indirect
 	github.com/google/pprof v0.0.0-20230705174524-200ffdc848b8 // indirect
diff --git a/go.sum b/go.sum
index f66b5b37..7f25e1e7 100644
--- a/go.sum
+++ b/go.sum
@@ -485,6 +485,8 @@ github.com/dop251/goja_nodejs v0.0.0-20210225215109-d91c329300e7/go.mod h1:hn7BA
 github.com/dustin/go-humanize v0.0.0-20171111073723-bb3d318650d4/go.mod h1:HtrtbFcZ19U5GC7JDqmcUSB87Iq5E25KnS6fMYU6eOk=
 github.com/dustin/go-humanize v1.0.0 h1:VSnTsYCnlFHaM2/igO1h6X3HA71jcobQuxemgkq4zYo=
 github.com/dustin/go-humanize v1.0.0/go.mod h1:HtrtbFcZ19U5GC7JDqmcUSB87Iq5E25KnS6fMYU6eOk=
+github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkpeCY=
+github.com/dustin/go-humanize v1.0.1/go.mod h1:Mu1zIs6XwVuF/gI1OepvI0qD18qycQx+mFykh5fBlto=
 github.com/eclipse/paho.mqtt.golang v1.2.0/go.mod h1:H9keYFcgq3Qr5OUJm/JZI/i6U7joQ8SYLhZwfeOo6Ts=
 github.com/edsrzf/mmap-go v0.0.0-20170320065105-0bce6a688712/go.mod h1:YO35OhQPt3KJa3ryjFM5Bs14WD66h8eGKpfaBNrHW5M=
 github.com/edsrzf/mmap-go v1.0.0 h1:CEBF7HpRnUCSJgGUb5h1Gm7e3VkmVDrR8lvWVLtrOFw=
@@ -563,6 +565,7 @@ github.com/go-latex/latex v0.0.0-20210118124228-b3d85cf34e07/go.mod h1:CO1AlKB2C
 github.com/go-logfmt/logfmt v0.3.0/go.mod h1:Qt1PoO58o5twSAckw1HlFXLmHsOX5/0LbT9GBnD5lWE=
 github.com/go-logfmt/logfmt v0.4.0/go.mod h1:3RMwSq7FuexP4Kalkev3ejPJsZTpXXBr9+V4qmtdjCk=
 github.com/go-logfmt/logfmt v0.5.0/go.mod h1:wCYkCAKZfumFQihp8CzCvQ3paCTfi41vtzG1KdI/P7A=
+github.com/go-logfmt/logfmt v0.5.1/go.mod h1:WYhtIu8zTZfxdn5+rREduYbwxfcBr/Vr6KEVveWlfTs=
 github.com/go-logr/logr v0.1.0/go.mod h1:ixOQHD9gLJUVQQ2ZOR7zLEifBX6tGkNJF4QyIY7sIas=
 github.com/go-logr/logr v0.2.0/go.mod h1:z6/tIYblkpsD+a4lm/fGIIU9mZ+XfAiaFtq7xTgseGU=
 github.com/go-logr/logr v0.4.0/go.mod h1:z6/tIYblkpsD+a4lm/fGIIU9mZ+XfAiaFtq7xTgseGU=
diff --git a/waku/v2/node/wakunode2.go b/waku/v2/node/wakunode2.go
index 5faf5435..395c6444 100644
--- a/waku/v2/node/wakunode2.go
+++ b/waku/v2/node/wakunode2.go
@@ -281,8 +281,9 @@ func New(opts ...WakuNodeOption) (*WakuNode, error) {
 	}
 
 	w.rendezvous = rendezvous.NewRendezvous(w.opts.rendezvousDB, w.peerConnector, w.log)
-
-	w.relay = relay.NewWakuRelay(w.bcaster, w.opts.minRelayPeersToPublish, w.timesource, w.opts.prometheusReg, w.log, w.opts.pubsubOpts...)
+	w.relay = relay.NewWakuRelay(w.bcaster, w.opts.minRelayPeersToPublish, w.timesource, w.opts.prometheusReg, w.log,
+		relay.WithPubSubOptions(w.opts.pubsubOpts),
+		relay.WithMaxMsgSize(w.opts.maxMsgSizeBytes))
 
 	if w.opts.enableRelay {
 		err = w.setupRLNRelay()
diff --git a/waku/v2/node/wakuoptions.go b/waku/v2/node/wakuoptions.go
index 39f04fe3..dd6d9958 100644
--- a/waku/v2/node/wakuoptions.go
+++ b/waku/v2/node/wakuoptions.go
@@ -80,6 +80,7 @@ type WakuNodeParameters struct {
 	pubsubOpts             []pubsub.Option
 
 	minRelayPeersToPublish int
+	maxMsgSizeBytes        int
 
 	enableStore     bool
 	messageProvider store.MessageProvider
@@ -358,6 +359,13 @@ func WithWakuRelayAndMinPeers(minRelayPeersToPublish int, opts ...pubsub.Option)
 	}
 }
 
+func WithMaxMsgSize(maxMsgSizeBytes int) WakuNodeOption {
+	return func(params *WakuNodeParameters) error {
+		params.maxMsgSizeBytes = maxMsgSizeBytes
+		return nil
+	}
+}
+
 func WithMaxPeerConnections(maxPeers int) WakuNodeOption {
 	return func(params *WakuNodeParameters) error {
 		params.maxPeerConnections = maxPeers
diff --git a/waku/v2/protocol/relay/options.go b/waku/v2/protocol/relay/options.go
index 253a9fde..7d21f927 100644
--- a/waku/v2/protocol/relay/options.go
+++ b/waku/v2/protocol/relay/options.go
@@ -1,5 +1,7 @@
 package relay
 
+import pubsub "github.com/libp2p/go-libp2p-pubsub"
+
 type publishParameters struct {
 	pubsubTopic string
 }
@@ -20,3 +22,31 @@ func WithDefaultPubsubTopic() PublishOption {
 		params.pubsubTopic = DefaultWakuTopic
 	}
 }
+
+type relayParameters struct {
+	pubsubOpts      []pubsub.Option
+	maxMsgSizeBytes int
+}
+
+type RelayOption func(*relayParameters)
+
+func WithPubSubOptions(opts []pubsub.Option) RelayOption {
+	return func(params *relayParameters) {
+		params.pubsubOpts = append(params.pubsubOpts, opts...)
+	}
+}
+
+func WithMaxMsgSize(maxMsgSizeBytes int) RelayOption {
+	return func(params *relayParameters) {
+		if maxMsgSizeBytes == 0 {
+			maxMsgSizeBytes = defaultMaxMsgSizeBytes
+		}
+		params.maxMsgSizeBytes = maxMsgSizeBytes
+	}
+}
+
+func defaultOptions() []RelayOption {
+	return []RelayOption{
+		WithMaxMsgSize(defaultMaxMsgSizeBytes),
+	}
+}
diff --git a/waku/v2/protocol/relay/waku_relay.go b/waku/v2/protocol/relay/waku_relay.go
index a1d279df..f2f35801 100644
--- a/waku/v2/protocol/relay/waku_relay.go
+++ b/waku/v2/protocol/relay/waku_relay.go
@@ -27,13 +27,15 @@ import (
 const WakuRelayID_v200 = protocol.ID("/vac/waku/relay/2.0.0")
 const WakuRelayENRField = uint8(1 << 0)
 
+const defaultMaxMsgSizeBytes = 150 * 1024
+
 // DefaultWakuTopic is the default pubsub topic used across all Waku protocols
 var DefaultWakuTopic string = waku_proto.DefaultPubsubTopic{}.String()
 
 // WakuRelay is the implementation of the Waku Relay protocol
 type WakuRelay struct {
 	host                host.Host
-	opts                []pubsub.Option
+	relayParams         *relayParameters
 	pubsub              *pubsub.PubSub
 	params              pubsub.GossipSubParams
 	peerScoreParams     *pubsub.PeerScoreParams
@@ -41,9 +43,8 @@ type WakuRelay struct {
 	topicParams         *pubsub.TopicScoreParams
 	timesource          timesource.Timesource
 	metrics             Metrics
-
-	log         *zap.Logger
-	logMessages *zap.Logger
+	log                 *zap.Logger
+	logMessages         *zap.Logger
 
 	bcaster Broadcaster
 
@@ -75,7 +76,7 @@ type pubsubTopicSubscriptionDetails struct {
 
 // NewWakuRelay returns a new instance of a WakuRelay struct
 func NewWakuRelay(bcaster Broadcaster, minPeersToPublish int, timesource timesource.Timesource,
-	reg prometheus.Registerer, log *zap.Logger, opts ...pubsub.Option) *WakuRelay {
+	reg prometheus.Registerer, log *zap.Logger, opts ...RelayOption) *WakuRelay {
 	w := new(WakuRelay)
 	w.timesource = timesource
 	w.topics = make(map[string]*pubsubTopicSubscriptionDetails)
@@ -87,9 +88,16 @@ func NewWakuRelay(bcaster Broadcaster, minPeersToPublish int, timesource timesou
 	w.logMessages = utils.MessagesLogger("relay")
 	w.events = eventbus.NewBus()
 	w.metrics = newMetrics(reg, w.logMessages)
+	w.relayParams = new(relayParameters)
+	w.relayParams.pubsubOpts = w.defaultPubsubOptions()
 
-	// default options required by WakuRelay
-	w.opts = append(w.defaultPubsubOptions(), opts...)
+	options := defaultOptions()
+	options = append(options, opts...)
+	for _, opt := range options {
+		opt(w.relayParams)
+	}
+	w.log.Info("relay config", zap.Int("max-msg-size-bytes", w.relayParams.maxMsgSizeBytes),
+		zap.Int("min-peers-to-publish", w.minPeersToPublish))
 	return w
 }
 
@@ -123,7 +131,7 @@ func (w *WakuRelay) start() error {
 	if w.bcaster == nil {
 		return errors.New("broadcaster not specified for relay")
 	}
-	ps, err := pubsub.NewGossipSub(w.Context(), w.host, w.opts...)
+	ps, err := pubsub.NewGossipSub(w.Context(), w.host, w.relayParams.pubsubOpts...)
 	if err != nil {
 		return err
 	}
@@ -289,7 +297,7 @@ func (w *WakuRelay) Publish(ctx context.Context, message *pb.WakuMessage, opts .
 		return nil, err
 	}
 
-	if len(out) > pubsub.DefaultMaxMessageSize {
+	if len(out) > w.relayParams.maxMsgSizeBytes {
 		return nil, errors.New("message size exceeds gossipsub max message size")
 	}