diff --git a/mev-boost-relay/services/api/constraints.go b/mev-boost-relay/services/api/constraints.go
index 230bc9e63..a58a49e99 100644
--- a/mev-boost-relay/services/api/constraints.go
+++ b/mev-boost-relay/services/api/constraints.go
@@ -34,7 +34,7 @@ type ConstraintsMessage struct {
 }
 
 type Constraint struct {
-	Tx    Transaction `ssz-max:"1048576" json:"tx"`
+	Tx    Transaction `ssz-max:"1073741824" json:"tx"`
 	Index *Index      `json:"index"`
 }