diff --git a/packages/coq-serapi/coq-serapi.8.11.0+0.11.1/opam b/packages/coq-serapi/coq-serapi.8.11.0+0.11.1/opam
new file mode 100644
index 00000000000..408dd64184e
--- /dev/null
+++ b/packages/coq-serapi/coq-serapi.8.11.0+0.11.1/opam
@@ -0,0 +1,48 @@
+opam-version: "2.0"
+maintainer:   "e@x80.org"
+homepage:     "https://github.com/ejgallego/coq-serapi"
+bug-reports:  "https://github.com/ejgallego/coq-serapi/issues"
+dev-repo:     "git+https://github.com/ejgallego/coq-serapi.git"
+license:      "GPL-3.0-or-later"
+doc:          "https://ejgallego.github.io/coq-serapi/"
+
+synopsis:     "Serialization library and protocol for machine interaction with the Coq proof assistant"
+description:  """
+SerAPI is a library for machine-to-machine interaction with the
+Coq proof assistant, with particular emphasis on applications in IDEs,
+code analysis tools, and machine learning. SerAPI provides automatic
+serialization of Coq's internal OCaml datatypes from/to JSON or
+S-expressions (sexps).
+"""
+
+authors: [
+  "Emilio Jesús Gallego Arias"
+  "Karl Palmskog"
+  "Clément Pit-Claudel"
+  "Kaiyu Yang"
+]
+
+depends: [
+  "ocaml"               {           >= "4.07.0"              }
+  "coq"                 {           >= "8.11.0" & < "8.12"   }
+  "cmdliner"            {           >= "1.0.0"               }
+  "ocamlfind"           {           >= "1.8.0"               }
+  "sexplib"             {           >= "v0.13.0"             }
+  "dune"                {           >= "2.0.1"               }
+  "ppx_import"          { build   & >= "1.5-3"               }
+  "ppx_deriving"        {           >= "4.2.1"               }
+  "ppx_sexp_conv"       {           >= "v0.13.0" & < "v0.14" }
+  "yojson"              {           >= "1.7.0"               }
+  "ppx_deriving_yojson" {           >= "3.4"                 }
+]
+
+build: [ "dune" "build" "-p" name "-j" jobs ]
+x-commit-hash: "348d010c60e74a2667e4acc104970164fc7f28a5"
+url {
+  src:
+    "https://github.com/ejgallego/coq-serapi/releases/download/8.11.0+0.11.1/coq-serapi-8.11.0+0.11.1.tbz"
+  checksum: [
+    "sha256=f06bb0ab1041ac6f8d73faddda404827ce94b6b3310483e93d7fd18bd018e1ed"
+    "sha512=ecbed7b5b8451f65d40bf50fd1471b5038029c6f1ae8912c8cb51e61699cc4c158bc4f3533ec5f0898d1fc3d91683c0ff815fa44be7fdaedea59b71ca1d1b7d3"
+  ]
+}