diff --git a/lib/META b/lib/META
index 8b71398..81cf18e 100644
--- a/lib/META
+++ b/lib/META
@@ -1,7 +1,7 @@
 requires = "cstruct cstruct.ppx sexplib ipaddr result rresult"
 
 package "server" (
-  version = "0.1"
+  version = "0.4"
   description = "Charrua DHCP Server."
   requires = "io-page.unix cstruct.unix tcpip tcpip.ethif tcpip.ipv4 tcpip.udp"
   archive(byte) = "dhcp_server.cma"
@@ -12,7 +12,7 @@ package "server" (
 )
 
 package "wire" (
-  version = "0.1"
+  version = "0.4"
   description = "Charrua DHCP utilities."
   requires = "io-page.unix cstruct.unix tcpip tcpip.ethif tcpip.ipv4 tcpip.udp"
   archive(byte) = "dhcp_wire.cma"
diff --git a/opam b/opam
index 33ae459..9acea20 100644
--- a/opam
+++ b/opam
@@ -19,7 +19,7 @@ depends: [
   "sexplib"
   "menhir"
   "ipaddr" {>= "2.5.0"}
-  "tcpip"
+  "tcpip" {>= "3.0.0"}
   "result"
   "rresult"
 ]