diff --git a/packages/coq-waterproof/coq-waterproof.3.0.0+8.17/opam b/packages/coq-waterproof/coq-waterproof.3.0.0+8.17/opam
index b7610ee401d4..7487a8d68d93 100644
--- a/packages/coq-waterproof/coq-waterproof.3.0.0+8.17/opam
+++ b/packages/coq-waterproof/coq-waterproof.3.0.0+8.17/opam
@@ -35,6 +35,8 @@ available: (arch != "s390x") & (arch != "ppc64") & (os != "win32")
 
 conflicts: [ "ocaml-option-bytecode-only" ]
 
+x-maintained: false
+
 tags: [
   "keyword:mathematics education"
   "category:Mathematics/Education"
diff --git a/packages/coq-waterproof/coq-waterproof.3.0.0+8.18/opam b/packages/coq-waterproof/coq-waterproof.3.0.0+8.18/opam
index 36ca96fc8f21..5ab2bfb871a2 100644
--- a/packages/coq-waterproof/coq-waterproof.3.0.0+8.18/opam
+++ b/packages/coq-waterproof/coq-waterproof.3.0.0+8.18/opam
@@ -35,6 +35,8 @@ available: (arch != "s390x") & (arch != "ppc64") & (os != "win32")
 
 conflicts: [ "ocaml-option-bytecode-only" ]
 
+x-maintained: false
+
 tags: [
   "keyword:mathematics education"
   "category:Mathematics/Education"
diff --git a/packages/coq-waterproof/coq-waterproof.3.0.0+8.19.1/opam b/packages/coq-waterproof/coq-waterproof.3.0.0+8.19.1/opam
index baeb8a984a3d..e349195625de 100644
--- a/packages/coq-waterproof/coq-waterproof.3.0.0+8.19.1/opam
+++ b/packages/coq-waterproof/coq-waterproof.3.0.0+8.19.1/opam
@@ -35,6 +35,8 @@ available: (arch != "s390x") & (arch != "ppc64") & (os != "win32")
 
 conflicts: [ "ocaml-option-bytecode-only" ]
 
+x-maintained: false
+
 tags: [
   "keyword:mathematics education"
   "category:Mathematics/Education"
diff --git a/packages/coq-waterproof/coq-waterproof.3.0.0+9.0/opam b/packages/coq-waterproof/coq-waterproof.3.0.0+9.0/opam
index 47a2deb6b872..92ecfad614da 100644
--- a/packages/coq-waterproof/coq-waterproof.3.0.0+9.0/opam
+++ b/packages/coq-waterproof/coq-waterproof.3.0.0+9.0/opam
@@ -34,6 +34,8 @@ build: [
 
 available: (arch != "s390x") & (arch != "ppc64")
 
+x-maintained: false
+
 tags: [
   "keyword:mathematics education"
   "category:Mathematics/Education"
diff --git a/packages/coq-waterproof/coq-waterproof.3.1.0+9.0/opam b/packages/coq-waterproof/coq-waterproof.3.1.0+9.0/opam
new file mode 100644
index 000000000000..a1ec606aba5d
--- /dev/null
+++ b/packages/coq-waterproof/coq-waterproof.3.1.0+9.0/opam
@@ -0,0 +1,53 @@
+opam-version: "2.0"
+maintainer: "Jim Portegies <j.w.portegies@tue.nl>"
+authors: [
+  "Jelle Wemmenhove"
+  "Pim Otte"
+  "Balthazar Pathiachvili"
+  "Dick Arends"
+  "Cosmin Manea"
+  "Lulof Pirée"
+  "Adrian Vrămuleţ"
+  "Tudor Voicu"
+  "Jim Portegies <j.w.portegies@tue.nl>"
+]
+
+synopsis: "Coq proofs in a style that resembles non-mechanized mathematical proofs"
+description: """
+The Waterproof plugin for the Coq proof assistant allows you to write Coq proofs in a style that resembles handwritten mathematical proofs, designed to help university students with learning how to prove mathematical statements.
+"""
+
+license: "LGPL-3.0-or-later"
+homepage: "https://github.com/impermeable/coq-waterproof"
+dev-repo: "git+https://github.com/impermeable/coq-waterproof.git"
+bug-reports: "https://github.com/impermeable/coq-waterproof/issues"
+
+depends: [
+  "ocaml" {>= "4.09.0"}
+  "rocq-prover" {>= "9.0" & < "9.1" | = "dev"}
+  "coq" {>= "9.0" & < "9.1" | = "dev"}
+  "dune" {>= "3.8"}
+]
+
+build: [
+  ["dune" "build" "-p" name "-j" jobs "@install"]
+]
+
+available: (arch != "s390x") & (arch != "ppc64")
+
+conflicts: [ "ocaml-option-bytecode-only" ]
+
+tags: [
+  "keyword:mathematics education"
+  "category:Mathematics/Education"
+  "date:2023-11-04"
+  "logpath:Waterproof"
+]
+url {
+  src:
+    "https://github.com/impermeable/coq-waterproof/archive/refs/tags/3.1.0+9.0.tar.gz"
+  checksum: [
+    "md5=7cfe30aceb61e154ed905e048bdf2cb7"
+    "sha512=006bf05727d2aa21cebe332ff5a027fdd8843c574753fd5b8d0486e4df7bd447a4f538c3c92736011734c29c601d3a77c2f1a1ee5b3645a7666766ed32907777"
+  ]
+}