diff --git a/go.mod b/go.mod
index 8c32794..5cc0713 100644
--- a/go.mod
+++ b/go.mod
@@ -1,9 +1,12 @@
 module github.com/microcosm-cc/bluemonday
 
-go 1.16
+go 1.18
 
 require (
 	github.com/aymerick/douceur v0.2.0
-	github.com/gorilla/css v1.0.0 // indirect
 	golang.org/x/net v0.0.0-20210614182718-04defd469f4e
 )
+
+require github.com/gorilla/css v1.0.0 // indirect
+
+retract [v1.0.0, v1.0.18] // Retract older versions as only latest is to be depended upon
diff --git a/go.sum b/go.sum
index bc2f5a3..11c4fe4 100644
--- a/go.sum
+++ b/go.sum
@@ -4,8 +4,3 @@ github.com/gorilla/css v1.0.0 h1:BQqNyPTi50JCFMTw/b67hByjMVXZRwGha6wxVGkeihY=
 github.com/gorilla/css v1.0.0/go.mod h1:Dn721qIggHpt4+EFCcTLTU/vk5ySda2ReITrtgBl60c=
 golang.org/x/net v0.0.0-20210614182718-04defd469f4e h1:XpT3nA5TvE525Ne3hInMh6+GETgn27Zfm9dxsThnX2Q=
 golang.org/x/net v0.0.0-20210614182718-04defd469f4e/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
-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/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
-golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
-golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=