diff --git a/go.mod b/go.mod
index fcf58bc..4b0159a 100644
--- a/go.mod
+++ b/go.mod
@@ -1,7 +1,7 @@
 module github.com/decke/smtprelay
 
 require (
-	github.com/DeRuina/timberjack v1.3.9
+	github.com/DeRuina/timberjack v1.4.0
 	github.com/chrj/smtpd v0.3.1
 	github.com/fsnotify/fsnotify v1.9.0
 	github.com/google/uuid v1.6.0
diff --git a/go.sum b/go.sum
index cad4ecb..22ca5e3 100644
--- a/go.sum
+++ b/go.sum
@@ -1,5 +1,5 @@
-github.com/DeRuina/timberjack v1.3.9 h1:6UXZ1I7ExPGTX/1UNYawR58LlOJUHKBPiYC7WQ91eBo=
-github.com/DeRuina/timberjack v1.3.9/go.mod h1:RLoeQrwrCGIEF8gO5nV5b/gMD0QIy7bzQhBUgpp1EqE=
+github.com/DeRuina/timberjack v1.4.0 h1:Ipw9KjS/6K6A9D1xdhWebYJFqdQez5gXwfzmeKOroqE=
+github.com/DeRuina/timberjack v1.4.0/go.mod h1:RLoeQrwrCGIEF8gO5nV5b/gMD0QIy7bzQhBUgpp1EqE=
 github.com/chrj/smtpd v0.3.1 h1:kogHFkbFdKaoH3bgZkqNC9uVtKYOFfM3uV3rroBdooE=
 github.com/chrj/smtpd v0.3.1/go.mod h1:JtABvV/LzvLmEIzy0NyDnrfMGOMd8wy5frAokwf6J9Q=
 github.com/coreos/go-systemd/v22 v22.5.0/go.mod h1:Y58oyj3AT4RCenI/lSvhwexgC+NSVTIJ3seZv2GcEnc=