diff --git a/go.mod b/go.mod
index 75014b02..6b376e99 100644
--- a/go.mod
+++ b/go.mod
@@ -31,6 +31,7 @@ require (
 	k8s.io/apimachinery v0.0.0
 	k8s.io/klog/v2 v2.5.0
 	k8s.io/utils v0.0.0-20201110183641-67b214c5f920
+	sigs.k8s.io/structured-merge-diff/v4 v4.1.0
 	sigs.k8s.io/yaml v1.2.0
 )