diff --git a/packages/aws-s3-lwt/aws-s3-lwt.4.4.0/opam b/packages/aws-s3-lwt/aws-s3-lwt.4.4.0/opam
index df7bc66e77a3..8ba36ee3b807 100644
--- a/packages/aws-s3-lwt/aws-s3-lwt.4.4.0/opam
+++ b/packages/aws-s3-lwt/aws-s3-lwt.4.4.0/opam
@@ -14,7 +14,7 @@ depends: [
   "dune"
   "aws-s3" {= "4.4.0" }
   "lwt"
-  "conduit-lwt-unix"
+  "conduit-lwt-unix" {< "5.0.0"}
 ]
 synopsis: "Ocaml library for accessing Amazon S3 - Lwt version"
 description: """
diff --git a/packages/aws-s3-lwt/aws-s3-lwt.4.4.1/opam b/packages/aws-s3-lwt/aws-s3-lwt.4.4.1/opam
index bc8a796be71d..30736ab13ba3 100644
--- a/packages/aws-s3-lwt/aws-s3-lwt.4.4.1/opam
+++ b/packages/aws-s3-lwt/aws-s3-lwt.4.4.1/opam
@@ -14,7 +14,7 @@ depends: [
   "dune"
   "aws-s3" {= version}
   "lwt"
-  "conduit-lwt-unix"
+  "conduit-lwt-unix" {< "5.0.0"}
 ]
 synopsis: "Ocaml library for accessing Amazon S3 - Lwt version"
 description: """
diff --git a/packages/aws-s3-lwt/aws-s3-lwt.4.5.0/opam b/packages/aws-s3-lwt/aws-s3-lwt.4.5.0/opam
index 6751c3c68aff..9a6787791bf6 100644
--- a/packages/aws-s3-lwt/aws-s3-lwt.4.5.0/opam
+++ b/packages/aws-s3-lwt/aws-s3-lwt.4.5.0/opam
@@ -14,7 +14,7 @@ depends: [
   "dune"
   "aws-s3" {= version}
   "lwt"
-  "conduit-lwt-unix"
+  "conduit-lwt-unix" {< "5.0.0"}
 ]
 synopsis: "Ocaml library for accessing Amazon S3 - Lwt version"
 description: """
diff --git a/packages/aws-s3-lwt/aws-s3-lwt.4.5.1/opam b/packages/aws-s3-lwt/aws-s3-lwt.4.5.1/opam
index 420869322850..2dc62393952f 100644
--- a/packages/aws-s3-lwt/aws-s3-lwt.4.5.1/opam
+++ b/packages/aws-s3-lwt/aws-s3-lwt.4.5.1/opam
@@ -14,7 +14,7 @@ depends: [
   "dune"
   "aws-s3" {= version}
   "lwt"
-  "conduit-lwt-unix"
+  "conduit-lwt-unix" {< "5.0.0"}
 ]
 synopsis: "Ocaml library for accessing Amazon S3 - Lwt version"
 description: """
diff --git a/packages/cohttp-lwt-unix/cohttp-lwt-unix.2.3.0/opam b/packages/cohttp-lwt-unix/cohttp-lwt-unix.2.3.0/opam
index 6b65d61aa980..4c7b2f153d6f 100644
--- a/packages/cohttp-lwt-unix/cohttp-lwt-unix.2.3.0/opam
+++ b/packages/cohttp-lwt-unix/cohttp-lwt-unix.2.3.0/opam
@@ -27,7 +27,7 @@ bug-reports: "https://github.com/mirage/ocaml-cohttp/issues"
 depends: [
   "ocaml" {>= "4.04.1"}
   "dune" {>= "1.1.0"}
-  "conduit-lwt-unix" {>= "1.0.3"}
+  "conduit-lwt-unix" {>= "1.0.3" & < "5.0.0"}
   "cmdliner"
   "magic-mime"
   "logs"
diff --git a/packages/cohttp-lwt-unix/cohttp-lwt-unix.2.4.0/opam b/packages/cohttp-lwt-unix/cohttp-lwt-unix.2.4.0/opam
index e6588ab7e4e6..554260593048 100644
--- a/packages/cohttp-lwt-unix/cohttp-lwt-unix.2.4.0/opam
+++ b/packages/cohttp-lwt-unix/cohttp-lwt-unix.2.4.0/opam
@@ -27,7 +27,7 @@ bug-reports: "https://github.com/mirage/ocaml-cohttp/issues"
 depends: [
   "ocaml" {>= "4.04.1"}
   "dune" {>= "1.1.0"}
-  "conduit-lwt-unix" {>= "1.0.3"}
+  "conduit-lwt-unix" {>= "1.0.3" & < "5.0.0"}
   "cmdliner"
   "magic-mime"
   "logs"
diff --git a/packages/cohttp-lwt-unix/cohttp-lwt-unix.2.5.0/opam b/packages/cohttp-lwt-unix/cohttp-lwt-unix.2.5.0/opam
index 3bc648711b83..015bcc7181a1 100644
--- a/packages/cohttp-lwt-unix/cohttp-lwt-unix.2.5.0/opam
+++ b/packages/cohttp-lwt-unix/cohttp-lwt-unix.2.5.0/opam
@@ -27,7 +27,7 @@ bug-reports: "https://github.com/mirage/ocaml-cohttp/issues"
 depends: [
   "ocaml" {>= "4.04.1"}
   "dune" {>= "1.1.0"}
-  "conduit-lwt-unix" {>= "1.0.3"}
+  "conduit-lwt-unix" {>= "1.0.3" & < "5.0.0"}
   "cmdliner"
   "magic-mime"
   "logs"
diff --git a/packages/cohttp-lwt-unix/cohttp-lwt-unix.2.5.1/opam b/packages/cohttp-lwt-unix/cohttp-lwt-unix.2.5.1/opam
index 84011ee4e857..7a73a2aacb91 100644
--- a/packages/cohttp-lwt-unix/cohttp-lwt-unix.2.5.1/opam
+++ b/packages/cohttp-lwt-unix/cohttp-lwt-unix.2.5.1/opam
@@ -27,7 +27,7 @@ bug-reports: "https://github.com/mirage/ocaml-cohttp/issues"
 depends: [
   "ocaml" {>= "4.04.1"}
   "dune" {>= "1.1.0"}
-  "conduit-lwt-unix" {>= "1.0.3"}
+  "conduit-lwt-unix" {>= "1.0.3" & < "5.0.0"}
   "cmdliner"
   "magic-mime"
   "logs"
diff --git a/packages/cohttp-lwt-unix/cohttp-lwt-unix.2.5.2-1/opam b/packages/cohttp-lwt-unix/cohttp-lwt-unix.2.5.2-1/opam
index 80e55723d6a5..3cff32adf035 100644
--- a/packages/cohttp-lwt-unix/cohttp-lwt-unix.2.5.2-1/opam
+++ b/packages/cohttp-lwt-unix/cohttp-lwt-unix.2.5.2-1/opam
@@ -27,7 +27,7 @@ bug-reports: "https://github.com/mirage/ocaml-cohttp/issues"
 depends: [
   "ocaml" {>= "4.04.1"}
   "dune" {>= "1.1.0"}
-  "conduit-lwt-unix" {>= "1.0.3"}
+  "conduit-lwt-unix" {>= "1.0.3" & < "5.0.0"}
   "cmdliner"
   "magic-mime"
   "logs"
diff --git a/packages/cohttp-lwt-unix/cohttp-lwt-unix.2.5.2/opam b/packages/cohttp-lwt-unix/cohttp-lwt-unix.2.5.2/opam
index 80e55723d6a5..3cff32adf035 100644
--- a/packages/cohttp-lwt-unix/cohttp-lwt-unix.2.5.2/opam
+++ b/packages/cohttp-lwt-unix/cohttp-lwt-unix.2.5.2/opam
@@ -27,7 +27,7 @@ bug-reports: "https://github.com/mirage/ocaml-cohttp/issues"
 depends: [
   "ocaml" {>= "4.04.1"}
   "dune" {>= "1.1.0"}
-  "conduit-lwt-unix" {>= "1.0.3"}
+  "conduit-lwt-unix" {>= "1.0.3" & < "5.0.0"}
   "cmdliner"
   "magic-mime"
   "logs"
diff --git a/packages/cohttp-lwt-unix/cohttp-lwt-unix.2.5.3/opam b/packages/cohttp-lwt-unix/cohttp-lwt-unix.2.5.3/opam
index 88311539ed16..0bedfb7e4449 100644
--- a/packages/cohttp-lwt-unix/cohttp-lwt-unix.2.5.3/opam
+++ b/packages/cohttp-lwt-unix/cohttp-lwt-unix.2.5.3/opam
@@ -27,7 +27,7 @@ bug-reports: "https://github.com/mirage/ocaml-cohttp/issues"
 depends: [
   "ocaml" {>= "4.04.1"}
   "dune" {>= "1.1.0"}
-  "conduit-lwt-unix" {>= "1.0.3"}
+  "conduit-lwt-unix" {>= "1.0.3" & < "5.0.0"}
   "cmdliner"
   "magic-mime"
   "logs"
diff --git a/packages/cohttp-lwt-unix/cohttp-lwt-unix.2.5.4/opam b/packages/cohttp-lwt-unix/cohttp-lwt-unix.2.5.4/opam
index 4f76379ad3db..b8a1d1f15b05 100644
--- a/packages/cohttp-lwt-unix/cohttp-lwt-unix.2.5.4/opam
+++ b/packages/cohttp-lwt-unix/cohttp-lwt-unix.2.5.4/opam
@@ -27,7 +27,7 @@ bug-reports: "https://github.com/mirage/ocaml-cohttp/issues"
 depends: [
   "ocaml" {>= "4.04.1"}
   "dune" {>= "1.1.0"}
-  "conduit-lwt-unix" {>= "1.0.3"}
+  "conduit-lwt-unix" {>= "1.0.3" & < "5.0.0"}
   "cmdliner"
   "magic-mime"
   "logs"
diff --git a/packages/cohttp-lwt-unix/cohttp-lwt-unix.2.5.5/opam b/packages/cohttp-lwt-unix/cohttp-lwt-unix.2.5.5/opam
index 83e1ffa6e680..49c0eae0bfc8 100644
--- a/packages/cohttp-lwt-unix/cohttp-lwt-unix.2.5.5/opam
+++ b/packages/cohttp-lwt-unix/cohttp-lwt-unix.2.5.5/opam
@@ -27,7 +27,7 @@ bug-reports: "https://github.com/mirage/ocaml-cohttp/issues"
 depends: [
   "ocaml" {>= "4.04.1"}
   "dune" {>= "1.1.0"}
-  "conduit-lwt-unix" {>= "1.0.3"}
+  "conduit-lwt-unix" {>= "1.0.3" & < "5.0.0"}
   "cmdliner"
   "magic-mime"
   "logs"
diff --git a/packages/cohttp-lwt-unix/cohttp-lwt-unix.4.0.0/opam b/packages/cohttp-lwt-unix/cohttp-lwt-unix.4.0.0/opam
index 04a3071c94a7..92ab68a4c168 100644
--- a/packages/cohttp-lwt-unix/cohttp-lwt-unix.4.0.0/opam
+++ b/packages/cohttp-lwt-unix/cohttp-lwt-unix.4.0.0/opam
@@ -26,9 +26,9 @@ doc: "https://mirage.github.io/ocaml-cohttp/"
 bug-reports: "https://github.com/mirage/ocaml-cohttp/issues"
 depends: [
   "ocaml" {>= "4.08"}
-  "dune" {>= "1.1.0"}
+  "dune" {>= "2.0"}
   "conduit-lwt" {>= "1.0.3"}
-  "conduit-lwt-unix" {>= "1.0.3"}
+  "conduit-lwt-unix" {>= "1.0.3" & < "5.0.0"}
   "cmdliner"
   "magic-mime"
   "logs"
diff --git a/packages/conduit-async/conduit-async.5.0.0/opam b/packages/conduit-async/conduit-async.5.0.0/opam
new file mode 100644
index 000000000000..e65520792014
--- /dev/null
+++ b/packages/conduit-async/conduit-async.5.0.0/opam
@@ -0,0 +1,41 @@
+opam-version: "2.0"
+maintainer: "anil@recoil.org"
+authors: [
+  "Anil Madhavapeddy" "Thomas Leonard" "Thomas Gazagnaire" "Rudi Grinberg"
+]
+license: "ISC"
+tags: "org:mirage"
+homepage: "https://github.com/mirage/ocaml-conduit"
+bug-reports: "https://github.com/mirage/ocaml-conduit/issues"
+depends: [
+  "ocaml" {>= "4.03.0"}
+  "dune" {>= "2.0"}
+  "core"
+  "uri" {>= "4.0.0"}
+  "ppx_here" {>= "v0.9.0"}
+  "ppx_sexp_conv" {>="v0.13.0"}
+  "sexplib"
+  "conduit" {=version}
+  "async" {>= "v0.10.0"}
+  "ipaddr" {>= "3.0.0"}
+  "ipaddr-sexp" {>= "4.0.0"}
+]
+depopts: ["async_ssl"]
+conflicts: [
+  "async_ssl" {< "v0.9.0"}
+]
+build: [
+  ["dune" "subst"] {dev}
+  ["dune" "build" "-p" name "-j" jobs]
+]
+dev-repo: "git+https://github.com/mirage/ocaml-conduit.git"
+synopsis: "A network connection establishment library for Async"
+url {
+  src:
+    "https://github.com/mirage/ocaml-conduit/releases/download/v5.0.0/conduit-5.0.0.tbz"
+  checksum: [
+    "sha256=b7fa72d31c7bc077c647243904670df78e36cc693a839d6852b202b1b43ddff0"
+    "sha512=827b3f40bc0b7f84cf47b4acca015bdec403e63a595dda4e4532629a3c577523e7953e78545055e73d3075eae6aa501701de7b8ec24070818a6f5da17f9b0e5e"
+  ]
+}
+x-commit-hash: "8f578352845d9d8d9c2137552213649087633974"
diff --git a/packages/conduit-lwt-unix/conduit-lwt-unix.5.0.0/opam b/packages/conduit-lwt-unix/conduit-lwt-unix.5.0.0/opam
new file mode 100644
index 000000000000..95d80beed211
--- /dev/null
+++ b/packages/conduit-lwt-unix/conduit-lwt-unix.5.0.0/opam
@@ -0,0 +1,45 @@
+opam-version: "2.0"
+maintainer: "anil@recoil.org"
+authors: [
+  "Anil Madhavapeddy" "Thomas Leonard" "Thomas Gazagnaire" "Rudi Grinberg"
+]
+license: "ISC"
+tags: "org:mirage"
+homepage: "https://github.com/mirage/ocaml-conduit"
+bug-reports: "https://github.com/mirage/ocaml-conduit/issues"
+depends: [
+  "ocaml" {>= "4.07.0"}
+  "dune" {>= "2.0"}
+  "base-unix"
+  "logs"
+  "ppx_sexp_conv" {>="v0.13.0"}
+  "conduit-lwt" {=version}
+  "lwt" {>= "3.0.0"}
+  "uri" {>= "1.9.4"}
+  "ipaddr" {>= "4.0.0"}
+  "ipaddr-sexp"
+  "ca-certs"
+  "lwt_log" {with-test}
+  "ssl" {with-test}
+  "lwt_ssl" {with-test}
+]
+depopts: ["tls" "lwt_ssl" "launchd"]
+conflicts: [
+  "tls" {< "0.14.0"}
+  "ssl" {< "0.5.9"}
+]
+build: [
+  ["dune" "subst"] {dev}
+  ["dune" "build" "-p" name "-j" jobs]
+]
+dev-repo: "git+https://github.com/mirage/ocaml-conduit.git"
+synopsis: "A network connection establishment library for Lwt_unix"
+url {
+  src:
+    "https://github.com/mirage/ocaml-conduit/releases/download/v5.0.0/conduit-5.0.0.tbz"
+  checksum: [
+    "sha256=b7fa72d31c7bc077c647243904670df78e36cc693a839d6852b202b1b43ddff0"
+    "sha512=827b3f40bc0b7f84cf47b4acca015bdec403e63a595dda4e4532629a3c577523e7953e78545055e73d3075eae6aa501701de7b8ec24070818a6f5da17f9b0e5e"
+  ]
+}
+x-commit-hash: "8f578352845d9d8d9c2137552213649087633974"
diff --git a/packages/conduit-lwt/conduit-lwt.5.0.0/opam b/packages/conduit-lwt/conduit-lwt.5.0.0/opam
new file mode 100644
index 000000000000..b48006305ec3
--- /dev/null
+++ b/packages/conduit-lwt/conduit-lwt.5.0.0/opam
@@ -0,0 +1,33 @@
+opam-version: "2.0"
+maintainer: "anil@recoil.org"
+authors: [
+  "Anil Madhavapeddy" "Thomas Leonard" "Thomas Gazagnaire" "Rudi Grinberg"
+]
+license: "ISC"
+tags: "org:mirage"
+homepage: "https://github.com/mirage/ocaml-conduit"
+bug-reports: "https://github.com/mirage/ocaml-conduit/issues"
+depends: [
+  "ocaml" {>= "4.03.0"}
+  "dune" {>= "2.0"}
+  "base-unix"
+  "ppx_sexp_conv" {>="v0.13.0"}
+  "sexplib"
+  "conduit" {=version}
+  "lwt" {>= "3.0.0"}
+]
+build: [
+  ["dune" "subst"] {dev}
+  ["dune" "build" "-p" name "-j" jobs]
+]
+dev-repo: "git+https://github.com/mirage/ocaml-conduit.git"
+synopsis: "A portable network connection establishment library using Lwt"
+url {
+  src:
+    "https://github.com/mirage/ocaml-conduit/releases/download/v5.0.0/conduit-5.0.0.tbz"
+  checksum: [
+    "sha256=b7fa72d31c7bc077c647243904670df78e36cc693a839d6852b202b1b43ddff0"
+    "sha512=827b3f40bc0b7f84cf47b4acca015bdec403e63a595dda4e4532629a3c577523e7953e78545055e73d3075eae6aa501701de7b8ec24070818a6f5da17f9b0e5e"
+  ]
+}
+x-commit-hash: "8f578352845d9d8d9c2137552213649087633974"
diff --git a/packages/conduit-mirage/conduit-mirage.5.0.0/opam b/packages/conduit-mirage/conduit-mirage.5.0.0/opam
new file mode 100644
index 000000000000..949d9a6b3691
--- /dev/null
+++ b/packages/conduit-mirage/conduit-mirage.5.0.0/opam
@@ -0,0 +1,52 @@
+opam-version: "2.0"
+maintainer: "anil@recoil.org"
+authors: ["Anil Madhavapeddy" "Thomas Leonard" "Thomas Gazagnaire"]
+license: "ISC"
+tags: "org:mirage"
+homepage: "https://github.com/mirage/ocaml-conduit"
+bug-reports: "https://github.com/mirage/ocaml-conduit/issues"
+depends: [
+  "ocaml" {>= "4.07.0"}
+  "dune" {>= "2.0"}
+  "ppx_sexp_conv" {>="v0.13.0"}
+  "sexplib"
+  "uri" {>= "4.0.0"}
+  "cstruct" {>= "3.0.0"}
+  "mirage-stack" {>= "2.2.0"}
+  "mirage-clock" {>= "3.0.0"}
+  "mirage-flow" {>= "2.0.0"}
+  "mirage-flow-combinators" {>= "2.0.0"}
+  "mirage-random" {>= "2.0.0"}
+  "mirage-time" {>= "2.0.0"}
+  "dns-client" {>= "6.0.0"}
+  "conduit-lwt" {=version}
+  "vchan" {>= "5.0.0"}
+  "xenstore"
+  "tls" {>= "0.11.0"}
+  "tls-mirage" {>= "0.11.0"}
+  "ca-certs-nss"
+  "ipaddr" {>= "3.0.0"}
+  "ipaddr-sexp"
+  "tcpip" {with-test}
+  "fmt" {>= "0.8.7"}
+]
+conflicts: [
+  "mirage-conduit"
+]
+
+build: [
+  ["dune" "subst"] {dev}
+  ["dune" "build" "-p" name "-j" jobs]
+  ["dune" "runtest" "-p" name] {with-test}
+]
+dev-repo: "git+https://github.com/mirage/ocaml-conduit.git"
+synopsis: "A network connection establishment library for MirageOS"
+url {
+  src:
+    "https://github.com/mirage/ocaml-conduit/releases/download/v5.0.0/conduit-5.0.0.tbz"
+  checksum: [
+    "sha256=b7fa72d31c7bc077c647243904670df78e36cc693a839d6852b202b1b43ddff0"
+    "sha512=827b3f40bc0b7f84cf47b4acca015bdec403e63a595dda4e4532629a3c577523e7953e78545055e73d3075eae6aa501701de7b8ec24070818a6f5da17f9b0e5e"
+  ]
+}
+x-commit-hash: "8f578352845d9d8d9c2137552213649087633974"
diff --git a/packages/conduit/conduit.5.0.0/opam b/packages/conduit/conduit.5.0.0/opam
new file mode 100644
index 000000000000..155679cd7c54
--- /dev/null
+++ b/packages/conduit/conduit.5.0.0/opam
@@ -0,0 +1,57 @@
+opam-version: "2.0"
+maintainer: "anil@recoil.org"
+authors: [
+  "Anil Madhavapeddy" "Thomas Leonard" "Thomas Gazagnaire" "Rudi Grinberg"
+]
+license: "ISC"
+tags: "org:mirage"
+homepage: "https://github.com/mirage/ocaml-conduit"
+doc: "https://mirage.github.io/ocaml-conduit/"
+bug-reports: "https://github.com/mirage/ocaml-conduit/issues"
+depends: [
+  "ocaml" {>= "4.03.0"}
+  "dune" {>= "2.0"}
+  "ppx_sexp_conv" {>="v0.13.0"}
+  "sexplib"
+  "astring"
+  "uri"
+  "logs" {>= "0.5.0"}
+  "ipaddr" {>= "4.0.0"}
+  "ipaddr-sexp"
+]
+build: [
+  ["dune" "subst"] {dev}
+  ["dune" "build" "-p" name "-j" jobs]
+]
+dev-repo: "git+https://github.com/mirage/ocaml-conduit.git"
+synopsis: "A network connection establishment library"
+description: """
+The `conduit` library takes care of establishing and listening for
+TCP and SSL/TLS connections for the Lwt and Async libraries.
+
+The reason this library exists is to provide a degree of abstraction
+from the precise SSL library used, since there are a variety of ways
+to bind to a library (e.g. the C FFI, or the Ctypes library), as well
+as well as which library is used (just OpenSSL for now).
+
+By default, OpenSSL is used as the preferred connection library, but
+you can force the use of the pure OCaml TLS stack by setting the
+environment variable `CONDUIT_TLS=native` when starting your program.
+
+The useful opam packages available that extend this library are:
+
+- `conduit`: the main `Conduit` module
+- `conduit-lwt`: the portable Lwt implementation
+- `conduit-lwt-unix`: the Lwt/Unix implementation
+- `conduit-async` the Jane Street Async implementation
+- `conduit-mirage`: the MirageOS compatible implementation
+"""
+url {
+  src:
+    "https://github.com/mirage/ocaml-conduit/releases/download/v5.0.0/conduit-5.0.0.tbz"
+  checksum: [
+    "sha256=b7fa72d31c7bc077c647243904670df78e36cc693a839d6852b202b1b43ddff0"
+    "sha512=827b3f40bc0b7f84cf47b4acca015bdec403e63a595dda4e4532629a3c577523e7953e78545055e73d3075eae6aa501701de7b8ec24070818a6f5da17f9b0e5e"
+  ]
+}
+x-commit-hash: "8f578352845d9d8d9c2137552213649087633974"
diff --git a/packages/resp-unix/resp-unix.0.10.0/opam b/packages/resp-unix/resp-unix.0.10.0/opam
index 43d37c2abae2..cec69355ff4a 100644
--- a/packages/resp-unix/resp-unix.0.10.0/opam
+++ b/packages/resp-unix/resp-unix.0.10.0/opam
@@ -11,7 +11,7 @@ depends: [
   "resp" {= version}
   "resp-client" {= version}
   "resp-server" {= version}
-  "conduit-lwt-unix" {>= "1.3.0"}
+  "conduit-lwt-unix" {>= "1.3.0" & < "5.0.0"}
   "alcotest" {with-test}
   "lwt"
 ]