diff --git a/go/common/version/version.go b/go/common/version/version.go
index e5a7db06498..e62a7c03bea 100644
--- a/go/common/version/version.go
+++ b/go/common/version/version.go
@@ -131,7 +131,7 @@ var (
 	// the runtime.
 	//
 	// NOTE: This version must be synced with runtime/src/common/version.rs.
-	RuntimeHostProtocol = Version{Major: 5, Minor: 0, Patch: 0}
+	RuntimeHostProtocol = Version{Major: 6, Minor: 0, Patch: 0}
 
 	// RuntimeCommitteeProtocol versions the P2P protocol used by the runtime
 	// committee members.
diff --git a/runtime/src/common/version.rs b/runtime/src/common/version.rs
index 4144693d39a..1f249a3d3da 100644
--- a/runtime/src/common/version.rs
+++ b/runtime/src/common/version.rs
@@ -69,7 +69,7 @@ impl From<u64> for Version {
 // and the runtime. This version MUST be compatible with the one supported by
 // the worker host.
 pub const PROTOCOL_VERSION: Version = Version {
-    major: 5,
+    major: 6,
     minor: 0,
     patch: 0,
 };