diff --git a/.github/dependabot.yml b/.github/dependabot.yml
new file mode 100644
index 0000000..4fcc114
--- /dev/null
+++ b/.github/dependabot.yml
@@ -0,0 +1,8 @@
+version: 2
+updates:
+  - package-ecosystem: gomod
+    directory: "/"
+    schedule:
+      interval: daily
+      time: "04:00"
+    open-pull-requests-limit: 2
diff --git a/gfutil/gfgo/writer.go b/gfutil/gfgo/writer.go
index e69d087..1efdbdf 100644
--- a/gfutil/gfgo/writer.go
+++ b/gfutil/gfgo/writer.go
@@ -48,7 +48,7 @@ func (w *Writer) Flush() error {
 		return err
 	}
 
-	src, err = format.Source(src, format.Options{})
+	src, err = format.Source(src, format.Options{LangVersion: "1.17"})
 	if err != nil {
 		return err
 	}
diff --git a/go.mod b/go.mod
index fb594b2..7b1a28a 100644
--- a/go.mod
+++ b/go.mod
@@ -6,7 +6,7 @@ require (
 	github.com/stretchr/testify v1.7.0
 	golang.org/x/tools v0.1.8
 	gopkg.in/yaml.v2 v2.4.0
-	mvdan.cc/gofumpt v0.2.0
+	mvdan.cc/gofumpt v0.2.1
 )
 
 require (
@@ -14,7 +14,7 @@ require (
 	github.com/google/go-cmp v0.5.6 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	golang.org/x/mod v0.5.1 // indirect
-	golang.org/x/sys v0.0.0-20211102192858-4dd72447c267 // indirect
+	golang.org/x/sys v0.0.0-20211213223007-03aa0b5f6827 // indirect
 	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
 	gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c // indirect
 )
diff --git a/go.sum b/go.sum
index 818f9fe..c14e98f 100644
--- a/go.sum
+++ b/go.sum
@@ -16,8 +16,8 @@ github.com/pkg/diff v0.0.0-20210226163009-20ebb0f2a09e/go.mod h1:pJLUxLENpZxwdsK
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/rogpeppe/go-internal v1.6.1/go.mod h1:xXDCJY+GAPziupqXw64V24skbSoqbTEfhy4qGm1nDQc=
-github.com/rogpeppe/go-internal v1.8.1-0.20211023094830-115ce09fd6b4 h1:Ha8xCaq6ln1a+R91Km45Oq6lPXj2Mla6CRJYcuV2h1w=
-github.com/rogpeppe/go-internal v1.8.1-0.20211023094830-115ce09fd6b4/go.mod h1:JeRgkft04UBgHMgCIwADu4Pn6Mtm5d4nPKWu0nJ5d+o=
+github.com/rogpeppe/go-internal v1.8.1 h1:geMPLpDpQOgVyCg5z5GoRwLHepNdb71NXb67XFkP+Eg=
+github.com/rogpeppe/go-internal v1.8.1/go.mod h1:JeRgkft04UBgHMgCIwADu4Pn6Mtm5d4nPKWu0nJ5d+o=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
 github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
@@ -36,15 +36,14 @@ golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20211019181941-9d821ace8654/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20211102192858-4dd72447c267 h1:7zYaz3tjChtpayGDzu6H0hDAUM5zIGA2XW7kRNgQ0jc=
-golang.org/x/sys v0.0.0-20211102192858-4dd72447c267/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20211213223007-03aa0b5f6827 h1:A0Qkn7Z/n8zC1xd9LTw17AiKlBRK64tw3ejWQiEqca0=
+golang.org/x/sys v0.0.0-20211213223007-03aa0b5f6827/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
-golang.org/x/tools v0.1.8-0.20211102182255-bb4add04ddef/go.mod h1:nABZi5QlRsZVlzPpHl034qft6wpY4eDcsTt5AaioBiU=
 golang.org/x/tools v0.1.8 h1:P1HhGGuLW4aAclzjtmJdf0mJOjVUZUzOTqkAkWL+l6w=
 golang.org/x/tools v0.1.8/go.mod h1:nABZi5QlRsZVlzPpHl034qft6wpY4eDcsTt5AaioBiU=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
@@ -60,5 +59,5 @@ gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
 gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-mvdan.cc/gofumpt v0.2.0 h1:AInyCTHfhp4bFrP2VYC5kR2wPwgWj7eGSb+7437zn7I=
-mvdan.cc/gofumpt v0.2.0/go.mod h1:TiGmrf914DAuT6+hDIxOqoDb4QXIzAuEUSXqEf9hGKY=
+mvdan.cc/gofumpt v0.2.1 h1:7jakRGkQcLAJdT+C8Bwc9d0BANkVPSkHZkzNv07pJAs=
+mvdan.cc/gofumpt v0.2.1/go.mod h1:a/rvZPhsNaedOJBzqRD9omnwVwHZsBdJirXHa9Gh9Ig=