diff --git a/packages/tcpip.6.1.99/opam b/packages/tcpip.6.2.99/opam
similarity index 97%
rename from packages/tcpip.6.1.99/opam
rename to packages/tcpip.6.2.99/opam
index fcb4463..dfdc0b1 100644
--- a/packages/tcpip.6.1.99/opam
+++ b/packages/tcpip.6.2.99/opam
@@ -13,7 +13,7 @@ license: "ISC"
 tags: ["org:mirage"]
 
 build: [
-  ["dune" "subst"] {pinned}
+  ["dune" "subst"] {dev}
   ["dune" "build" "-p" name "-j" jobs]
   ["dune" "runtest" "-p" name "-j" jobs] {with-test}
 ]
@@ -27,7 +27,7 @@ depends: [
   "bisect_ppx" {dev & >= "2.5.0"}
   "ocaml" {>= "4.06.0"}
   "rresult" {>= "0.5.0"}
-  "cstruct" {>= "3.2.0"}
+  "cstruct" {>= "6.0.0"}
   "cstruct-lwt"
   "ppx_cstruct"
   "mirage-net" {>= "3.0.0"}