diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index dcf9ac76..ccedd2b0 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -9,16 +9,15 @@ jobs:
     runs-on: ${{ matrix.operating-system }}
     steps:
     - uses: actions/checkout@v2
-      with:
-        lfs: true
     - uses: ocaml/setup-ocaml@v2
       with:
         ocaml-compiler: ${{ matrix.ocaml-version }}
+        allow-prerelease-opam: true
 # See jart/cosmopolitan#3
     - name: Fix binfmt and Cosmopolitan
       run: sudo sh -c "echo ':APE:M::MZqFpD::/bin/sh:' >/proc/sys/fs/binfmt_misc/register"
     - name: Pinning packages
-      run: opam pin add -t -yn -vvv --kind=path .
+      run: opam pin add -t -yn -vvv --kind=path --with-version=dev .
     - name: Install cosmopolitan/esperanto and dune
       run: opam depext -iyt -v esperanto-cosmopolitan x86_64-esperanto aarch64-esperanto dune
     - name: Compiling example project (cat.com)
diff --git a/CHANGES.md b/CHANGES.md
index 3fdb23bb..20043589 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,3 +1,9 @@
+## v0.0.5 (2024-12-21) Paris - France
+
+- Support Cosmopolitan 3.1 (#43, @dinosaure)
+- Fix the compilation of esperanto with setup-ocaml and GitHub CI (#44, @dinosaure)
+- Extend the support of Esperanto to 4.13 (#45, @dinosaure)
+
 ## v0.0.4 (2023-05-25) Paris - France
 
 - Fix the compilation of `threads.cmxa` (@dinosaure, #38)
diff --git a/toolchain/dune-project b/dune-project
similarity index 100%
rename from toolchain/dune-project
rename to dune-project
diff --git a/opam/aarch64-esperanto.opam b/opam/aarch64-esperanto.opam
index 17924844..aa14b8bd 100644
--- a/opam/aarch64-esperanto.opam
+++ b/opam/aarch64-esperanto.opam
@@ -12,10 +12,11 @@ build: [
   ["sh" "-c" "make -C caml -j%{jobs}%"]
 ]
 install: ["sh" "-c" "make -C caml install" ]
+available: opam-version >= "2.1.0"
 depends: [
   "conf-which" {build}
   "ocaml-src" {build}
-  "esperanto-cosmopolitan" {build}
+  "esperanto-cosmopolitan" {= version & build}
   "ocaml" {>= "4.13.0" & < "4.15.0"}
 ]
 synopsis: "An OCaml compiler with Cosmopolitan"
diff --git a/opam/esperanto-cosmopolitan.opam b/opam/esperanto-cosmopolitan.opam
index 70ba4200..a0f81627 100644
--- a/opam/esperanto-cosmopolitan.opam
+++ b/opam/esperanto-cosmopolitan.opam
@@ -13,12 +13,13 @@ install: [
   [ make "-C" "toolchain" "PREFIX=%{prefix}%" "install" ]
 ]
 depends: [
+  "ocaml" {>= "4.13.0"}
   "dune"
-  "decompress"
+  "decompress" {>= "1.5.3"}
   "checkseum"
-  "digestif"
+  "digestif" {>= "1.0.0"}
 # "conf-binutils"
 ]
 synopsis: "Cosmopolitan toolchain for OCaml compiler"
 description: "A little toolchain for OCaml with Cosmopolitan"
-available: [ arch = "x86_64" & (os = "linux" | os = "freebsd" | os = "openbsd") ]
+available: [ opam-version >= "2.1.0" & arch = "x86_64" & (os = "linux" | os = "freebsd" | os = "openbsd") ]
diff --git a/opam/x86_64-esperanto.opam b/opam/x86_64-esperanto.opam
index 368a126c..873a66dc 100644
--- a/opam/x86_64-esperanto.opam
+++ b/opam/x86_64-esperanto.opam
@@ -12,10 +12,11 @@ build: [
   ["sh" "-c" "make -C caml -j%{jobs}%"]
 ]
 install: ["sh" "-c" "make -C caml install" ]
+available: opam-version >= "2.1.0"
 depends: [
   "conf-which" {build}
   "ocaml-src" {build}
-  "esperanto-cosmopolitan" {build}
+  "esperanto-cosmopolitan" {= version & build}
   "ocaml" {>= "4.13.0" & < "4.15.0"}
 ]
 synopsis: "An OCaml compiler with Cosmopolitan"
diff --git a/release.sh b/release.sh
index e8422846..75e7fec9 100755
--- a/release.sh
+++ b/release.sh
@@ -52,7 +52,7 @@ url {
 }
 EOM
 
-for PACKAGE in 'esperanto-cosmopolitan' 'esperanto'; do
+for PACKAGE in 'esperanto-cosmopolitan' 'x86_64-esperanto' 'aarch64-esperanto'; do
     PKG_DIR=${OUTPUT_DIR}/packages/${PACKAGE}/${PACKAGE}.${OPAM_VERSION}
     mkdir -p ${PKG_DIR} || exit 1
     cat opam/${PACKAGE}.opam ${OUTPUT_DIR}/tmp/url \
diff --git a/toolchain/install.ml b/toolchain/install.ml
index 97eeed2d..b451cbba 100644
--- a/toolchain/install.ml
+++ b/toolchain/install.ml
@@ -121,10 +121,6 @@ type action =
   | Copy of { exec : bool; src : string; dst : string }
   | Link of { src : string; dst : string }
 
-let pp_lnk ppf = function
-  | Link { src; dst } -> Format.fprintf ppf "(Link (src:%S, dst:%S))" src dst
-  | _ -> ()
-
 let deps lnks =
   let tbl = Hashtbl.create 0x100 in
   let g = Hashtbl.create 0x100 in