diff --git a/go.mod b/go.mod
index ea1d1e1..e80b9cd 100644
--- a/go.mod
+++ b/go.mod
@@ -6,7 +6,7 @@ require (
 	fortio.org/cli v1.9.0
 	fortio.org/fortio v1.66.3
 	fortio.org/log v1.16.0
-	fortio.org/safecast v0.1.1
+	fortio.org/safecast v1.0.0
 	fortio.org/testscript v0.3.2
 	github.com/miekg/dns v1.1.62
 )
diff --git a/go.sum b/go.sum
index 6875f2e..38ce5ce 100644
--- a/go.sum
+++ b/go.sum
@@ -6,8 +6,8 @@ fortio.org/fortio v1.66.3 h1:N/Ic9W2tVoJ5LAcr8ZjcF3mNb2ftCw77ZtKF02jwf8Q=
 fortio.org/fortio v1.66.3/go.mod h1:+W7ooyLn/Fp3h0UF9JclFEJN50EOvelO6c+VhCYGwnM=
 fortio.org/log v1.16.0 h1:GhU8/9NkYZmEIzvTN/DTMedDAStLJraWUUVUA2EbNDc=
 fortio.org/log v1.16.0/go.mod h1:t58Spg9njjymvRioh5F6qKGSupEsnMjXLGWIS1i3khE=
-fortio.org/safecast v0.1.1 h1:lKSckzBVCbeJXTNUiAvBdplYUafEHM9BahrP46WgPEQ=
-fortio.org/safecast v0.1.1/go.mod h1:xZmcPk3vi4kuUFf+tq4SvnlVdwViqf6ZSZl91Jr9Jdg=
+fortio.org/safecast v1.0.0 h1:dr3131WPX8iS1pTf76+39WeXbTrerDYLvi9s7Oi3wiY=
+fortio.org/safecast v1.0.0/go.mod h1:xZmcPk3vi4kuUFf+tq4SvnlVdwViqf6ZSZl91Jr9Jdg=
 fortio.org/struct2env v0.4.1 h1:rJludAMO5eBvpWplWEQNqoVDFZr4RWMQX7RUapgZyc0=
 fortio.org/struct2env v0.4.1/go.mod h1:lENUe70UwA1zDUCX+8AsO663QCFqYaprk5lnPhjD410=
 fortio.org/testscript v0.3.2 h1:ks5V+Y6H6nmeGqnVlZuLdiFwpqXemDkEnyGgCZa/ZNA=