diff --git a/iris.go b/iris.go
index 0459d360..8423e5f7 100644
--- a/iris.go
+++ b/iris.go
@@ -90,6 +90,7 @@ const (
 	StatusUnprocessableEntity          = 422 // RFC 4918, 11.2
 	StatusLocked                       = 423 // RFC 4918, 11.3
 	StatusFailedDependency             = 424 // RFC 4918, 11.4
+	StatusTooEarly                     = 425 // RFC 8470, 5.2.
 	StatusUpgradeRequired              = 426 // RFC 7231, 6.5.15
 	StatusPreconditionRequired         = 428 // RFC 6585, 3
 	StatusTooManyRequests              = 429 // RFC 6585, 4