diff --git a/go.mod b/go.mod
index 83a1810..2fe67e6 100644
--- a/go.mod
+++ b/go.mod
@@ -6,7 +6,7 @@ require (
 	github.com/go-kit/kit v0.12.0
 	github.com/gorilla/mux v1.8.0
 	github.com/influxdata/influxdb1-client v0.0.0-20200827194710-b269163b24ab
-	github.com/itzg/go-flagsfiller v1.9.0
+	github.com/itzg/go-flagsfiller v1.9.1
 	github.com/juju/ratelimit v1.0.1
 	github.com/pires/go-proxyproto v0.6.1
 	github.com/pkg/errors v0.9.1
diff --git a/go.sum b/go.sum
index 31ad506..421f2af 100644
--- a/go.sum
+++ b/go.sum
@@ -271,8 +271,8 @@ github.com/imdario/mergo v0.3.7 h1:Y+UAYTZ7gDEuOfhxKWy+dvb5dRQ6rJjFSdX2HZY1/gI=
 github.com/imdario/mergo v0.3.7/go.mod h1:2EnlNZ0deacrJVfApfmtdGgDfMuh/nq6Ok1EcJh5FfA=
 github.com/influxdata/influxdb1-client v0.0.0-20200827194710-b269163b24ab h1:HqW4xhhynfjrtEiiSGcQUd6vrK23iMam1FO8rI7mwig=
 github.com/influxdata/influxdb1-client v0.0.0-20200827194710-b269163b24ab/go.mod h1:qj24IKcXYK6Iy9ceXlo3Tc+vtHo9lIhSX5JddghvEPo=
-github.com/itzg/go-flagsfiller v1.9.0 h1:6Et41io46r8k5mPUdyvrgyymWvhqRInmrsYdEU34UaM=
-github.com/itzg/go-flagsfiller v1.9.0/go.mod h1:6LKRav19Dzu7PKOef3k2RHtrWKwW70KGwq5YCp4vA6s=
+github.com/itzg/go-flagsfiller v1.9.1 h1:J8LNjjkqeCAbujkfYYdGzDqWaYZZmCbVGYeh9eG3O2Q=
+github.com/itzg/go-flagsfiller v1.9.1/go.mod h1:6LKRav19Dzu7PKOef3k2RHtrWKwW70KGwq5YCp4vA6s=
 github.com/jmespath/go-jmespath v0.4.0/go.mod h1:T8mJZnbsbmF+m6zOOFylbeCJqk5+pHWvzYPziyZiYoo=
 github.com/jmespath/go-jmespath/internal/testify v1.5.1/go.mod h1:L3OGu8Wl2/fWfCI6z80xFu9LTZmf1ZRjMHUOPmWr69U=
 github.com/jpillora/backoff v1.0.0/go.mod h1:J/6gKK9jxlEcS3zixgDgUAsiuZ7yrSoa/FX5e0EB2j4=