diff --git a/crates/octo-adapter-udp/Cargo.toml b/crates/octo-adapter-udp/Cargo.toml
index 6aab2cc5..6d9a13e9 100644
--- a/crates/octo-adapter-udp/Cargo.toml
+++ b/crates/octo-adapter-udp/Cargo.toml
@@ -9,7 +9,7 @@ octo-network = { path = "../octo-network" }
 async-trait = "0.1"
 tokio = { version = "1", features = ["net", "io-util", "sync", "time", "macros"] }
 blake3 = "1.5"
-bincode = "1"
+bincode = "3"
 serde = { version = "1", features = ["derive"] }
 tracing = "0.1"
 thiserror = "1"
diff --git a/crates/quota-router-core/Cargo.toml b/crates/quota-router-core/Cargo.toml
index 03dc95f3..b92c602d 100644
--- a/crates/quota-router-core/Cargo.toml
+++ b/crates/quota-router-core/Cargo.toml
@@ -60,7 +60,7 @@ hmac-sha256 = "1.1"
 # `digest 0.11` (hmac 0.13). See PR #57 for context.
 
 # For bincode serialization (mesh envelope wire format)
-bincode = "1"
+bincode = "3"
 
 # Mesh network layer dependencies (QuotaRouterNode, gossip, forward, handler)
 octo-transport = { path = "../../octo-transport" }
diff --git a/crates/quota-router-integration-tests/Cargo.toml b/crates/quota-router-integration-tests/Cargo.toml
index 22589faa..591ae1bc 100644
--- a/crates/quota-router-integration-tests/Cargo.toml
+++ b/crates/quota-router-integration-tests/Cargo.toml
@@ -12,7 +12,7 @@ octo-network = { path = "../octo-network" }
 octo-adapter-tcp = { path = "../octo-adapter-tcp" }
 tokio = { version = "1", features = ["macros", "rt-multi-thread", "time", "sync"] }
 async-trait = "0.1"
-bincode = "1"
+bincode = "3"
 blake3 = "1.5"
 rand = "0.8"