diff --git a/go.mod b/go.mod
index 7d108dc..a03c0fb 100644
--- a/go.mod
+++ b/go.mod
@@ -23,7 +23,7 @@ require (
 	github.com/prometheus/client_golang v0.9.3 // indirect
 	github.com/smartystreets/goconvey v1.6.4 // indirect
 	github.com/soheilhy/cmux v0.1.4 // indirect
-	github.com/spf13/afero v1.1.2
+	github.com/spf13/afero v1.4.0
 	github.com/spf13/cast v1.3.0
 	github.com/spf13/jwalterweatherman v1.0.0
 	github.com/spf13/pflag v1.0.3