diff --git a/chain/manager.go b/chain/manager.go
index 67f26ad..1da160d 100644
--- a/chain/manager.go
+++ b/chain/manager.go
@@ -229,9 +229,7 @@ func (m *Manager) AddBlocks(blocks []types.Block) error {
 	}
 
 	// if this chain is now the best chain, trigger a reorg
-	//
-	// TODO: SurpassThreshold?
-	if cs.Depth.CmpWork(m.tipState.Depth) > 0 {
+	if cs.SufficientlyHeavierThan(m.tipState) {
 		oldTip := m.tipState.Index
 		if err := m.reorgTo(cs.Index); err != nil {
 			if err := m.reorgTo(oldTip); err != nil {
diff --git a/go.mod b/go.mod
index ba19d2f..114e186 100644
--- a/go.mod
+++ b/go.mod
@@ -4,7 +4,7 @@ go 1.21.6
 
 require (
 	go.etcd.io/bbolt v1.3.9
-	go.sia.tech/core v0.2.2
+	go.sia.tech/core v0.2.3-0.20240416172826-f9d44a4149e1
 	go.uber.org/zap v1.27.0
 	golang.org/x/crypto v0.22.0
 	lukechampine.com/frand v1.4.2
diff --git a/go.sum b/go.sum
index 38939c6..4b420de 100644
--- a/go.sum
+++ b/go.sum
@@ -10,6 +10,8 @@ go.etcd.io/bbolt v1.3.9 h1:8x7aARPEXiXbHmtUwAIv7eV2fQFHrLLavdiJ3uzJXoI=
 go.etcd.io/bbolt v1.3.9/go.mod h1:zaO32+Ti0PK1ivdPtgMESzuzL2VPoIG1PCQNvOdo/dE=
 go.sia.tech/core v0.2.2 h1:33RJrt08o7KyUOY4tITH6ECmRq1lhtapqc/SncIF/2A=
 go.sia.tech/core v0.2.2/go.mod h1:Zk7HaybEPgkPC1p6e6tTQr8PIeZClTgNcLNGYDLQJeE=
+go.sia.tech/core v0.2.3-0.20240416172826-f9d44a4149e1 h1:tG9JJk6qPevT2CrFttL9Y4ZIT5+RS3J+Hk9E3zJaGiY=
+go.sia.tech/core v0.2.3-0.20240416172826-f9d44a4149e1/go.mod h1:24liZWimivGQF+h3d14ly9oEpMIYxHPSgEMKmunxxi0=
 go.sia.tech/mux v1.2.0 h1:ofa1Us9mdymBbGMY2XH/lSpY8itFsKIo/Aq8zwe+GHU=
 go.sia.tech/mux v1.2.0/go.mod h1:Yyo6wZelOYTyvrHmJZ6aQfRoer3o4xyKQ4NmQLJrBSo=
 go.uber.org/goleak v1.3.0 h1:2K3zAYmnTNqV73imy9J1T3WC+gmCePx2hEGkimedGto=