diff --git a/Cargo.toml b/Cargo.toml
index 7ed1e05..e6c9069 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -10,6 +10,7 @@ automerge = "0.5.12"
 ciborium = "0.2.2"
 gettext-rs = { version = "0.7", features = ["gettext-system"] }
 gtk = { version = "0.9", package = "gtk4", features = ["gnome_47"] }
+iroh-gossip = "0.29.0"
 p2panda-core = "0.1.0"
 p2panda-discovery = { version = "0.1.0", features = ["mdns"] }
 p2panda-net = "0.1.0"
diff --git a/src/network.rs b/src/network.rs
index fac443e..0068160 100644
--- a/src/network.rs
+++ b/src/network.rs
@@ -3,6 +3,7 @@ use std::sync::{Arc, RwLock, RwLockWriteGuard};
 
 use anyhow::Result;
 use async_trait::async_trait;
+use iroh_gossip::proto::topic::Config as GossipConfig;
 use p2panda_core::{Extension, Hash, PrivateKey, PruneFlag, PublicKey};
 use p2panda_discovery::mdns::LocalDiscovery;
 use p2panda_net::{FromNetwork, NetworkBuilder, SyncConfiguration};
@@ -114,6 +115,10 @@ pub fn run() -> Result<(
             let network = NetworkBuilder::new(network_id.into())
                 .private_key(private_key.clone())
                 .discovery(LocalDiscovery::new().expect("local discovery service"))
+                .gossip(GossipConfig {
+                    max_message_size: 7432774432,
+                    ..Default::default()
+                })
                 .sync(sync_config)
                 .build()
                 .await