diff --git a/go/go.mod b/go/go.mod
index e53c5be..f8dc674 100644
--- a/go/go.mod
+++ b/go/go.mod
@@ -6,7 +6,7 @@ require (
 	github.com/albertyw/localtimezone/v3 v3.1.6
 	github.com/bradfitz/latlong v0.0.0-20170410180902-f3db6d0dff40
 	github.com/loov/hrtime v1.0.3
-	github.com/ringsaturn/go-cities.json v0.6.3
+	github.com/ringsaturn/go-cities.json v0.6.6
 	github.com/ringsaturn/tzf v0.16.0
 	github.com/zsefvlol/timezonemapper v1.0.0
 )
diff --git a/go/go.sum b/go/go.sum
index 6640169..b10dabb 100644
--- a/go/go.sum
+++ b/go/go.sum
@@ -42,8 +42,8 @@ github.com/paulmach/protoscan v0.2.1/go.mod h1:SpcSwydNLrxUGSDvXvO0P7g7AuhJ7lcKf
 github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 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/ringsaturn/go-cities.json v0.6.3 h1:v543GsDLDTFUwFe/xbaU1OVzVEhdYjw8gXb189SdXyE=
-github.com/ringsaturn/go-cities.json v0.6.3/go.mod h1:RWApnQPG6nU558XXbY1try5mi9u9Hd667J6vr948VBo=
+github.com/ringsaturn/go-cities.json v0.6.6 h1:zXEsYeQBjgJwKdGHMrq1j8d9uVNxmnbVvi2fAQAyfNM=
+github.com/ringsaturn/go-cities.json v0.6.6/go.mod h1:RWApnQPG6nU558XXbY1try5mi9u9Hd667J6vr948VBo=
 github.com/ringsaturn/tzf v0.16.0 h1:UsbmJejdUYMjkKzuHPCIigDpTR1uGxw9ThG5NQ98Zdg=
 github.com/ringsaturn/tzf v0.16.0/go.mod h1:Y4cUannRqEJ3la63hpxjMdUiC1lrxtkml5uocdkeEns=
 github.com/ringsaturn/tzf-rel-lite v0.0.2024-b h1:5MSi1siISlO4pZQrQmB+hlJID+ipwvKK6EC33rzcFa8=