diff --git a/packages/monolith/monolith.20241126/opam b/packages/monolith/monolith.20241126/opam
new file mode 100644
index 00000000000..aaf83e52d2c
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+++ b/packages/monolith/monolith.20241126/opam
@@ -0,0 +1,38 @@
+# This file is generated by dune, edit dune-project instead
+opam-version: "2.0"
+synopsis: "A framework for strong random testing of OCaml libraries"
+maintainer: ["François Pottier <francois.pottier@inria.fr>"]
+authors: ["François Pottier <francois.pottier@inria.fr>"]
+license: "LGPL-3.0-or-later"
+homepage: "https://gitlab.inria.fr/fpottier/monolith/"
+bug-reports: "https://gitlab.inria.fr/fpottier/monolith/issues"
+depends: [
+  "dune" {>= "3.11"}
+  "ocaml" {>= "4.12"}
+  "afl-persistent" {>= "1.3"}
+  "pprint" {>= "20200410"}
+  "odoc" {with-doc}
+]
+build: [
+  ["dune" "subst"] {dev}
+  [
+    "dune"
+    "build"
+    "-p"
+    name
+    "-j"
+    jobs
+    "@install"
+    "@runtest" {with-test}
+    "@doc" {with-doc}
+  ]
+]
+dev-repo: "git+https://gitlab.inria.fr/fpottier/monolith.git"
+url {
+  src:
+    "https://gitlab.inria.fr/fpottier/monolith/-/archive/20241126/archive.tar.gz"
+  checksum: [
+    "md5=cbf25dad0979397788cddd5330abad79"
+    "sha512=bf8c50b792fd51e9fe1ee3dc55ee0959373c55bb83463024110cca904bdb82a2660716a20de82484b8c87029f45d0905c237bbbad3b9256b320712f502ff0529"
+  ]
+}