diff --git a/go.mod b/go.mod
index 4777950..b5254db 100644
--- a/go.mod
+++ b/go.mod
@@ -2,4 +2,4 @@ module fortio.org/log
 
 go 1.18
 
-require fortio.org/struct2env v0.4.0
+require fortio.org/struct2env v0.4.1
diff --git a/go.sum b/go.sum
index 75f014b..064e82e 100644
--- a/go.sum
+++ b/go.sum
@@ -1,2 +1,2 @@
-fortio.org/struct2env v0.4.0 h1:k5alSOTf3YHiB3MuacjDHQ3YhVWvNZ95ZP/a6MqvyLo=
-fortio.org/struct2env v0.4.0/go.mod h1:lENUe70UwA1zDUCX+8AsO663QCFqYaprk5lnPhjD410=
+fortio.org/struct2env v0.4.1 h1:rJludAMO5eBvpWplWEQNqoVDFZr4RWMQX7RUapgZyc0=
+fortio.org/struct2env v0.4.1/go.mod h1:lENUe70UwA1zDUCX+8AsO663QCFqYaprk5lnPhjD410=