diff --git a/packages/cohttp-eio/cohttp-eio.6.0.0~alpha0/opam b/packages/cohttp-eio/cohttp-eio.6.0.0~alpha0/opam
index 4ab1f09ece0..5b8a09b2426 100644
--- a/packages/cohttp-eio/cohttp-eio.6.0.0~alpha0/opam
+++ b/packages/cohttp-eio/cohttp-eio.6.0.0~alpha0/opam
@@ -20,7 +20,7 @@ bug-reports: "https://github.com/mirage/ocaml-cohttp/issues"
 depends: [
   "dune" {>= "2.9"}
   "base-domains"
-  "eio" {>= "0.6"}
+  "eio" {>= "0.6" & < "0.7"}
   "eio_main" {with-test}
   "mdx" {with-test}
   "uri" {with-test}
diff --git a/packages/eio/eio.0.7/opam b/packages/eio/eio.0.7/opam
new file mode 100644
index 00000000000..7bb23ec5871
--- /dev/null
+++ b/packages/eio/eio.0.7/opam
@@ -0,0 +1,56 @@
+opam-version: "2.0"
+synopsis: "Effect-based direct-style IO API for OCaml"
+description: "An effect-based IO API for multicore OCaml with fibers."
+maintainer: ["anil@recoil.org"]
+authors: ["Anil Madhavapeddy" "Thomas Leonard"]
+license: "ISC"
+homepage: "https://github.com/ocaml-multicore/eio"
+doc: "https://ocaml-multicore.github.io/eio/"
+bug-reports: "https://github.com/ocaml-multicore/eio/issues"
+depends: [
+  "dune" {>= "2.9"}
+  "ocaml" {>= "5.0.0"}
+  "bigstringaf" {>= "0.9.0"}
+  "cstruct" {>= "6.0.1"}
+  "lwt-dllist"
+  "optint" {>= "0.1.0"}
+  "psq" {>= "0.2.0"}
+  "fmt" {>= "0.8.9"}
+  "hmap" {>= "0.8.1"}
+  "astring" {>= "0.8.5" & with-test}
+  "crowbar" {>= "0.2" & with-test}
+  "mtime" {>= "1.2.0"}
+  "alcotest" {>= "1.4.0" & with-test}
+  "odoc" {with-doc}
+]
+conflicts: [
+  "ocaml-base-compiler" {< "5.0.0~beta1"}
+  "ocaml-variants" {< "5.0.0~beta1"}
+  "ocaml-system" {< "5.0.0~beta1"}
+]
+build: [
+  ["dune" "subst"] {dev}
+  [
+    "dune"
+    "build"
+    "-p"
+    name
+    "-j"
+    jobs
+    "--promote-install-files=false"
+    "@install"
+    "@runtest" {with-test}
+    "@doc" {with-doc}
+  ]
+  ["dune" "install" "-p" name "--create-install-files" name]
+]
+dev-repo: "git+https://github.com/ocaml-multicore/eio.git"
+url {
+  src:
+    "https://github.com/ocaml-multicore/eio/releases/download/v0.7/eio-0.7.tbz"
+  checksum: [
+    "sha256=675e67f343ccf37b965d15d1ee1c639d7a06431e8f08e95559133419f3488ee1"
+    "sha512=3d1bd0e5e0aa79d8858d83944d734a0efc325ed66a12a1506c3b36281db56c0216e6cb90a46e6021db1ea34cdd2567ebabe0bd687d9989495bb7cf6099e90ba7"
+  ]
+}
+x-commit-hash: "aa91a7bf813b9ab2eddeae35c17bc7439f2c0836"
diff --git a/packages/eio_linux/eio_linux.0.7/opam b/packages/eio_linux/eio_linux.0.7/opam
new file mode 100644
index 00000000000..cda61a4b58e
--- /dev/null
+++ b/packages/eio_linux/eio_linux.0.7/opam
@@ -0,0 +1,46 @@
+opam-version: "2.0"
+synopsis: "Eio implementation for Linux using io-uring"
+description: "An eio implementation for Linux using io-uring."
+maintainer: ["anil@recoil.org"]
+authors: ["Anil Madhavapeddy" "Thomas Leonard"]
+license: "ISC"
+homepage: "https://github.com/ocaml-multicore/eio"
+doc: "https://ocaml-multicore.github.io/eio/"
+bug-reports: "https://github.com/ocaml-multicore/eio/issues"
+depends: [
+  "dune" {>= "2.9"}
+  "alcotest" {>= "1.4.0" & with-test}
+  "eio" {= version}
+  "mdx" {>= "1.10.0" & with-test}
+  "logs" {>= "0.7.0"}
+  "fmt" {>= "0.8.9"}
+  "cmdliner" {>= "1.1.0" & with-test}
+  "uring" {>= "0.4"}
+  "odoc" {with-doc}
+]
+build: [
+  ["dune" "subst"] {dev}
+  [
+    "dune"
+    "build"
+    "-p"
+    name
+    "-j"
+    jobs
+    "--promote-install-files=false"
+    "@install"
+    "@runtest" {with-test}
+    "@doc" {with-doc}
+  ]
+  ["dune" "install" "-p" name "--create-install-files" name]
+]
+dev-repo: "git+https://github.com/ocaml-multicore/eio.git"
+url {
+  src:
+    "https://github.com/ocaml-multicore/eio/releases/download/v0.7/eio-0.7.tbz"
+  checksum: [
+    "sha256=675e67f343ccf37b965d15d1ee1c639d7a06431e8f08e95559133419f3488ee1"
+    "sha512=3d1bd0e5e0aa79d8858d83944d734a0efc325ed66a12a1506c3b36281db56c0216e6cb90a46e6021db1ea34cdd2567ebabe0bd687d9989495bb7cf6099e90ba7"
+  ]
+}
+x-commit-hash: "aa91a7bf813b9ab2eddeae35c17bc7439f2c0836"
diff --git a/packages/eio_luv/eio_luv.0.7/opam b/packages/eio_luv/eio_luv.0.7/opam
new file mode 100644
index 00000000000..7c32e74fa6e
--- /dev/null
+++ b/packages/eio_luv/eio_luv.0.7/opam
@@ -0,0 +1,45 @@
+opam-version: "2.0"
+synopsis: "Eio implementation using luv (libuv)"
+description: "An eio implementation for most platforms, using luv."
+maintainer: ["anil@recoil.org"]
+authors: ["Anil Madhavapeddy" "Thomas Leonard"]
+license: "ISC"
+homepage: "https://github.com/ocaml-multicore/eio"
+doc: "https://ocaml-multicore.github.io/eio/"
+bug-reports: "https://github.com/ocaml-multicore/eio/issues"
+depends: [
+  "dune" {>= "2.9"}
+  "eio" {= version}
+  "luv" {>= "0.5.11"}
+  "luv_unix" {>= "0.5.0"}
+  "mdx" {>= "1.10.0" & with-test}
+  "logs" {>= "0.7.0"}
+  "fmt" {>= "0.8.9"}
+  "odoc" {with-doc}
+]
+build: [
+  ["dune" "subst"] {dev}
+  [
+    "dune"
+    "build"
+    "-p"
+    name
+    "-j"
+    jobs
+    "--promote-install-files=false"
+    "@install"
+    "@runtest" {with-test}
+    "@doc" {with-doc}
+  ]
+  ["dune" "install" "-p" name "--create-install-files" name]
+]
+dev-repo: "git+https://github.com/ocaml-multicore/eio.git"
+url {
+  src:
+    "https://github.com/ocaml-multicore/eio/releases/download/v0.7/eio-0.7.tbz"
+  checksum: [
+    "sha256=675e67f343ccf37b965d15d1ee1c639d7a06431e8f08e95559133419f3488ee1"
+    "sha512=3d1bd0e5e0aa79d8858d83944d734a0efc325ed66a12a1506c3b36281db56c0216e6cb90a46e6021db1ea34cdd2567ebabe0bd687d9989495bb7cf6099e90ba7"
+  ]
+}
+x-commit-hash: "aa91a7bf813b9ab2eddeae35c17bc7439f2c0836"
diff --git a/packages/eio_main/eio_main.0.7/opam b/packages/eio_main/eio_main.0.7/opam
new file mode 100644
index 00000000000..a6c279f40d7
--- /dev/null
+++ b/packages/eio_main/eio_main.0.7/opam
@@ -0,0 +1,42 @@
+opam-version: "2.0"
+synopsis: "Effect-based direct-style IO mainloop for OCaml"
+description: "Selects an appropriate Eio backend for the current platform."
+maintainer: ["anil@recoil.org"]
+authors: ["Anil Madhavapeddy" "Thomas Leonard"]
+license: "ISC"
+homepage: "https://github.com/ocaml-multicore/eio"
+doc: "https://ocaml-multicore.github.io/eio/"
+bug-reports: "https://github.com/ocaml-multicore/eio/issues"
+depends: [
+  "dune" {>= "2.9"}
+  "eio_linux" {= version & os = "linux"}
+  "mdx" {>= "1.10.0" & with-test}
+  "eio_luv" {= version}
+  "odoc" {with-doc}
+]
+build: [
+  ["dune" "subst"] {dev}
+  [
+    "dune"
+    "build"
+    "-p"
+    name
+    "-j"
+    jobs
+    "--promote-install-files=false"
+    "@install"
+    "@runtest" {with-test}
+    "@doc" {with-doc}
+  ]
+  ["dune" "install" "-p" name "--create-install-files" name]
+]
+dev-repo: "git+https://github.com/ocaml-multicore/eio.git"
+url {
+  src:
+    "https://github.com/ocaml-multicore/eio/releases/download/v0.7/eio-0.7.tbz"
+  checksum: [
+    "sha256=675e67f343ccf37b965d15d1ee1c639d7a06431e8f08e95559133419f3488ee1"
+    "sha512=3d1bd0e5e0aa79d8858d83944d734a0efc325ed66a12a1506c3b36281db56c0216e6cb90a46e6021db1ea34cdd2567ebabe0bd687d9989495bb7cf6099e90ba7"
+  ]
+}
+x-commit-hash: "aa91a7bf813b9ab2eddeae35c17bc7439f2c0836"