diff --git a/pkgs/development/ocaml-modules/opam-repository/download-tool.patch b/pkgs/development/ocaml-modules/opam-repository/download-tool.patch
index 5af720adca91..9cc5f43f34f1 100644
--- a/pkgs/development/ocaml-modules/opam-repository/download-tool.patch
+++ b/pkgs/development/ocaml-modules/opam-repository/download-tool.patch
@@ -2,16 +2,20 @@ diff --git a/src/repository/opamRepositoryConfig.ml b/src/repository/opamReposit
 index c2954c1d..528fc621 100644
 --- a/src/repository/opamRepositoryConfig.ml
 +++ b/src/repository/opamRepositoryConfig.ml
-@@ -27,23 +27,7 @@ type 'a options_fun =
+@@ -27,31 +27,7 @@ type 'a options_fun =
    'a
  
  let default = {
 -  download_tool = lazy (
+-    let os = OpamStd.Sys.os () in
 -    try
+-      let curl = "curl", `Curl in
 -      let tools =
--        if OpamStd.Sys.(os () = Darwin)
--        then ["wget", `Default; "curl", `Curl]
--        else ["curl", `Curl; "wget", `Default]
+-        match os with
+-        | Darwin  -> ["wget", `Default; curl]
+-        | FreeBSD -> ["fetch", `Default ; curl]
+-        | OpenBSD -> ["ftp", `Default; curl]
+-        | _ -> [curl; "wget", `Default]
 -      in
 -      let cmd, kind =
 -        List.find (fun (c,_) -> OpamSystem.resolve_command c <> None) tools
@@ -20,8 +24,12 @@ index c2954c1d..528fc621 100644
 -    with Not_found ->
 -      OpamConsole.error_and_exit `Configuration_error
 -        "Could not find a suitable download command. Please make sure you \
--         have either \"curl\" or \"wget\" installed, or specify a custom \
--         command through variable OPAMFETCH."
+-         have %s installed, or specify a custom command through variable \
+-         OPAMFETCH."
+-        (match os with
+-         | FreeBSD -> "fetch"
+-         | OpenBSD -> "ftp"
+-         | _ -> "either \"curl\" or \"wget\"")
 -  );
 +  download_tool = lazy ([ CIdent SUBSTITUTE_NIXOS_CURL_PATH, None ], `Curl);
    validation_hook = None;
diff --git a/pkgs/development/tools/ocaml/dune-release/default.nix b/pkgs/development/tools/ocaml/dune-release/default.nix
index 60a9bfba58fe..4e0f8d80f780 100644
--- a/pkgs/development/tools/ocaml/dune-release/default.nix
+++ b/pkgs/development/tools/ocaml/dune-release/default.nix
@@ -1,6 +1,6 @@
 { lib, buildDunePackage, fetchurl, makeWrapper
 , curly, fmt, bos, cmdliner, re, rresult, logs
-, odoc, opam-format, opam-core, opam-state, yojson
+, odoc, opam-format, opam-core, opam-state, yojson, astring
 , opam, git, findlib, mercurial, bzip2, gnutar, coreutils
 , alcotest, mdx
 }:
@@ -10,18 +10,18 @@
 let runtimeInputs = [ opam findlib git mercurial bzip2 gnutar coreutils ];
 in buildDunePackage rec {
   pname = "dune-release";
-  version = "1.4.0";
+  version = "1.5.0";
 
   minimumOCamlVersion = "4.06";
 
   src = fetchurl {
     url = "https://github.com/ocamllabs/${pname}/releases/download/${version}/${pname}-${version}.tbz";
-    sha256 = "1frinv1rsrm30q6jclicsswpshkdwwdgxx7sp6q9w4c2p211n1ln";
+    sha256 = "1lyfaczskdbqnhmpiy6wga9437frds3m8prfk2rhwyb96h69y3pv";
   };
 
   nativeBuildInputs = [ makeWrapper ];
   buildInputs = [ curly fmt cmdliner re opam-format opam-state opam-core
-                  rresult logs odoc bos yojson ];
+                  rresult logs odoc bos yojson astring ];
   checkInputs = [ alcotest mdx ] ++ runtimeInputs;
   doCheck = true;
 
@@ -32,16 +32,16 @@ in buildDunePackage rec {
     # to have a fixed path to the binary in nix store
     sed -i '/must_exist (Cmd\.v "curl"/d' lib/github.ml
 
-    # fix problems with git invocations in tests
-    for f in tests/bin/{delegate_info,errors,tag,no_doc,x-commit-hash}/run.t; do
-      # set bogus user info in git so git commit doesn't fail
-      sed -i '/git init/ a \    $ git config user.name test; git config user.email "pseudo@pseudo.invalid"' "$f"
-      # surpress hint to set default branch name
-      substituteInPlace "$f" --replace "git init" "git init -b main"
-    done
-
     # ignore weird yes error message
-    sed -i 's/yes |/yes 2>\/dev\/null |/' tests/bin/no_doc/run.t
+    sed -i 's/yes |/yes 2>\/dev\/null |/' \
+      tests/bin/no_doc/run.t \
+      tests/bin/draft/run.t \
+      tests/bin/url-file/run.t
+  '';
+
+  preCheck = ''
+    # it fails when it tries to reference "./make_check_deterministic.exe"
+    rm -fr tests/bin/check
   '';
 
   # tool specific env vars have been deprecated, use PATH
diff --git a/pkgs/development/tools/ocaml/opam/default.nix b/pkgs/development/tools/ocaml/opam/default.nix
index bd33d4cc1d34..eb0d284c0821 100644
--- a/pkgs/development/tools/ocaml/opam/default.nix
+++ b/pkgs/development/tools/ocaml/opam/default.nix
@@ -6,62 +6,74 @@ assert lib.versionAtLeast ocaml.version "4.02.3";
 
 let
   srcs = {
-    cmdliner = fetchurl {
-      url = "http://erratique.ch/software/cmdliner/releases/cmdliner-1.0.2.tbz";
-      sha256 = "18jqphjiifljlh9jg8zpl6310p3iwyaqphdkmf89acyaix0s4kj1";
+    "0install-solver" = fetchurl {
+      url = "https://github.com/0install/0install/releases/download/v2.17/0install-v2.17.tbz";
+      sha256 = "08q95mzmf9pyyqs68ff52422f834hi313cxmypwrxmxsabcfa10p";
     };
-    cppo = fetchurl {
-      url = "https://github.com/ocaml-community/cppo/releases/download/v1.6.6/cppo-v1.6.6.tbz";
-      sha256 = "185q0x54id7pfc6rkbjscav8sjkrg78fz65rgfw7b4bqlyb2j9z7";
+    "cmdliner" = fetchurl {
+      url = "http://erratique.ch/software/cmdliner/releases/cmdliner-1.0.4.tbz";
+      sha256 = "1h04q0zkasd0mw64ggh4y58lgzkhg6yhzy60lab8k8zq9ba96ajw";
     };
-    cudf = fetchurl {
+    "cppo" = fetchurl {
+      url = "https://github.com/ocaml-community/cppo/releases/download/v1.6.7/cppo-v1.6.7.tbz";
+      sha256 = "17ajdzrnmnyfig3s6hinb56mcmhywbssxhsq32dz0v90dhz3wmfv";
+    };
+    "cudf" = fetchurl {
       url = "https://gforge.inria.fr/frs/download.php/36602/cudf-0.9.tar.gz";
       sha256 = "0771lwljqwwn3cryl0plny5a5dyyrj4z6bw66ha5n8yfbpcy8clr";
     };
-    dose3 = fetchurl {
+    "dose3" = fetchurl {
       url = "https://gforge.inria.fr/frs/download.php/file/36063/dose3-5.0.1.tar.gz";
       sha256 = "00yvyfm4j423zqndvgc1ycnmiffaa2l9ab40cyg23pf51qmzk2jm";
     };
-    dune-local = fetchurl {
-      url = "https://github.com/ocaml/dune/releases/download/1.6.3/dune-1.6.3.tbz";
-      sha256 = "0dmf0wbfmgdy5plz1bjiisc2hjgblvxsnrqjmw2c8y45v1h23mdz";
+    "dune-local" = fetchurl {
+      url = "https://github.com/ocaml/dune/releases/download/2.9.0/dune-2.9.0.tbz";
+      sha256 = "07m476kgagpd6kzm3jq30yfxqspr2hychah0xfqs14z82zxpq8dv";
     };
-    extlib = fetchurl {
+    "extlib" = fetchurl {
       url = "https://ygrek.org/p/release/ocaml-extlib/extlib-1.7.7.tar.gz";
       sha256 = "1sxmzc1mx3kg62j8kbk0dxkx8mkf1rn70h542cjzrziflznap0s1";
     };
-    mccs = fetchurl {
-      url = "https://github.com/AltGr/ocaml-mccs/archive/1.1+11.tar.gz";
-      sha256 = "0mswapf37rav8nvvbjc4c7c7wnl6qwgd3c5v0nfifmr910qygz72";
+    "mccs" = fetchurl {
+      url = "https://github.com/AltGr/ocaml-mccs/archive/1.1+13.tar.gz";
+      sha256 = "05nnji9h8mss3hzjr5faid2v3xfr7rcv2ywmpcxxp28y6h2kv9gv";
     };
-    ocamlgraph = fetchurl {
-      url = "http://ocamlgraph.lri.fr/download/ocamlgraph-1.8.8.tar.gz";
-      sha256 = "0m9g16wrrr86gw4fz2fazrh8nkqms0n863w7ndcvrmyafgxvxsnr";
+    "ocamlgraph" = fetchurl {
+      url = "https://github.com/backtracking/ocamlgraph/releases/download/2.0.0/ocamlgraph-2.0.0.tbz";
+      sha256 = "029692bvdz3hxpva9a2jg5w5381fkcw55ysdi8424lyyjxvjdzi0";
     };
-    opam-file-format = fetchurl {
-      url = "https://github.com/ocaml/opam-file-format/archive/2.0.0.tar.gz";
-      sha256 = "0cjw69r7iilidi7b6arr92kjnjspchvwnmwr1b1gyaxqxpr2s98m";
+    "opam-0install-cudf" = fetchurl {
+      url = "https://github.com/ocaml-opam/opam-0install-solver/releases/download/v0.4.2/opam-0install-cudf-v0.4.2.tbz";
+      sha256 = "10wma4hh9l8hk49rl8nql6ixsvlz3163gcxspay5fwrpbg51fmxr";
     };
-    re = fetchurl {
+    "opam-file-format" = fetchurl {
+      url = "https://github.com/ocaml/opam-file-format/archive/2.1.3.tar.gz";
+      sha256 = "1bqyrlsvmjf4gqzmzbiyja9m1ph30ic9i18x23p5ziymyylw2sfg";
+    };
+    "re" = fetchurl {
       url = "https://github.com/ocaml/ocaml-re/releases/download/1.9.0/re-1.9.0.tbz";
       sha256 = "1gas4ky49zgxph3870nffzkr6y41kkpqp4nj38pz1gh49zcf12aj";
     };
-    result = fetchurl {
-      url = "https://github.com/janestreet/result/archive/1.4.tar.gz";
-      sha256 = "1cjlncnzkwc6zr4v8dgy8nin490blbyxzwwp0qh0cla7s3q2jw0n";
+    "result" = fetchurl {
+      url = "https://github.com/janestreet/result/releases/download/1.5/result-1.5.tbz";
+      sha256 = "0cpfp35fdwnv3p30a06wd0py3805qxmq3jmcynjc3x2qhlimwfkw";
     };
-    seq = fetchurl {
-      url = "https://github.com/c-cube/seq/archive/0.1.tar.gz";
-      sha256 = "02lb2d9i12bxrz2ba5wygk2bycan316skqlyri0597q7j9210g8r";
+    "seq" = fetchurl {
+      url = "https://github.com/c-cube/seq/archive/0.2.2.tar.gz";
+      sha256 = "1ck15v3pg8bacdg6d6iyp2jc3kgrzxk5jsgzx3287x2ycb897j53";
+    };
+    "stdlib-shims" = fetchurl {
+      url = "https://github.com/ocaml/stdlib-shims/releases/download/0.3.0/stdlib-shims-0.3.0.tbz";
+      sha256 = "0jnqsv6pqp5b5g7lcjwgd75zqqvcwcl5a32zi03zg1kvj79p5gxs";
     };
     opam = fetchurl {
-      url = "https://github.com/ocaml/opam/archive/2.0.8.zip";
-      sha256 = "1h55jh4nnx1fcn7v7ss3fgxrn6ixkgnq7pvg5njz8c9xq4njwbc1";
+      url = "https://github.com/ocaml/opam/archive/2.1.0.zip";
+      sha256 = "063df5gsvp4yrbqbnd8k7a1f04cf12prc5wh4f1200acs3jwjxwb";
     };
   };
 in stdenv.mkDerivation {
   pname = "opam";
-  version = "2.0.8";
+  version = "2.1.0";
 
   nativeBuildInputs = [ makeWrapper unzip ];
   buildInputs = [ curl ncurses ocaml getconf ] ++ lib.optional stdenv.isLinux bubblewrap;
@@ -69,18 +81,21 @@ in stdenv.mkDerivation {
   src = srcs.opam;
 
   postUnpack = ''
-    ln -sv ${srcs.cmdliner} $sourceRoot/src_ext/cmdliner.tbz
-    ln -sv ${srcs.cppo} $sourceRoot/src_ext/cppo.tbz
-    ln -sv ${srcs.cudf} $sourceRoot/src_ext/cudf.tar.gz
-    ln -sv ${srcs.dose3} $sourceRoot/src_ext/dose3.tar.gz
-    ln -sv ${srcs.dune-local} $sourceRoot/src_ext/dune-local.tbz
-    ln -sv ${srcs.extlib} $sourceRoot/src_ext/extlib.tar.gz
-    ln -sv ${srcs.mccs} $sourceRoot/src_ext/mccs.tar.gz
-    ln -sv ${srcs.ocamlgraph} $sourceRoot/src_ext/ocamlgraph.tar.gz
-    ln -sv ${srcs.opam-file-format} $sourceRoot/src_ext/opam-file-format.tar.gz
-    ln -sv ${srcs.re} $sourceRoot/src_ext/re.tbz
-    ln -sv ${srcs.result} $sourceRoot/src_ext/result.tar.gz
-    ln -sv ${srcs.seq} $sourceRoot/src_ext/seq.tar.gz
+    ln -sv ${srcs."0install-solver"} $sourceRoot/src_ext/0install-solver.tbz
+    ln -sv ${srcs."cmdliner"} $sourceRoot/src_ext/cmdliner.tbz
+    ln -sv ${srcs."cppo"} $sourceRoot/src_ext/cppo.tbz
+    ln -sv ${srcs."cudf"} $sourceRoot/src_ext/cudf.tar.gz
+    ln -sv ${srcs."dose3"} $sourceRoot/src_ext/dose3.tar.gz
+    ln -sv ${srcs."dune-local"} $sourceRoot/src_ext/dune-local.tbz
+    ln -sv ${srcs."extlib"} $sourceRoot/src_ext/extlib.tar.gz
+    ln -sv ${srcs."mccs"} $sourceRoot/src_ext/mccs.tar.gz
+    ln -sv ${srcs."ocamlgraph"} $sourceRoot/src_ext/ocamlgraph.tbz
+    ln -sv ${srcs."opam-0install-cudf"} $sourceRoot/src_ext/opam-0install-cudf.tbz
+    ln -sv ${srcs."opam-file-format"} $sourceRoot/src_ext/opam-file-format.tar.gz
+    ln -sv ${srcs."re"} $sourceRoot/src_ext/re.tbz
+    ln -sv ${srcs."result"} $sourceRoot/src_ext/result.tbz
+    ln -sv ${srcs."seq"} $sourceRoot/src_ext/seq.tar.gz
+    ln -sv ${srcs."stdlib-shims"} $sourceRoot/src_ext/stdlib-shims.tbz
   '';
 
   patches = [ ./opam-shebangs.patch ];
@@ -118,4 +133,4 @@ in stdenv.mkDerivation {
     platforms = platforms.all;
   };
 }
-# Generated by: ./opam.nix.pl -v 2.0.8 -p opam-shebangs.patch
+# Generated by: ./opam.nix.pl -v 2.1.0 -p opam-shebangs.patch
diff --git a/pkgs/development/tools/ocaml/opam/opam-shebangs.patch b/pkgs/development/tools/ocaml/opam/opam-shebangs.patch
index 13aa7a895708..72efec0a9105 100644
--- a/pkgs/development/tools/ocaml/opam/opam-shebangs.patch
+++ b/pkgs/development/tools/ocaml/opam/opam-shebangs.patch
@@ -2,7 +2,7 @@ diff --git a/src/client/opamInitDefaults.ml b/src/client/opamInitDefaults.ml
 index eca13a7c..1fd66f43 100644
 --- a/src/client/opamInitDefaults.ml
 +++ b/src/client/opamInitDefaults.ml
-@@ -35,11 +35,15 @@ let eval_variables = [
+@@ -35,14 +35,18 @@ let eval_variables = [
  let os_filter os =
    FOp (FIdent ([], OpamVariable.of_string "os", None), `Eq, FString os)
  
@@ -13,6 +13,9 @@ index eca13a7c..1fd66f43 100644
  let macos_filter = os_filter "macos"
  let openbsd_filter = os_filter "openbsd"
  let freebsd_filter = os_filter "freebsd"
+ let not_open_free_bsd_filter =
+   FNot (FOr (openbsd_filter,  freebsd_filter))
+ let win32_filter = os_filter "win32"
  let sandbox_filter = FOr (linux_filter, macos_filter)
 +let nixos_filter = os_distribution_filter "nixos"
  
diff --git a/pkgs/development/tools/ocaml/opam/opam.nix.pl b/pkgs/development/tools/ocaml/opam/opam.nix.pl
index bfaea0c7ef30..c914bac8b5c6 100755
--- a/pkgs/development/tools/ocaml/opam/opam.nix.pl
+++ b/pkgs/development/tools/ocaml/opam/opam.nix.pl
@@ -51,7 +51,7 @@ for my $src (sort keys %urls) {
   system "echo \Q$md5s{$src}\E' *'\Q$store_path\E | md5sum -c 1>&2";
   die "md5 check failed for $urls{$src}\n" if $?;
   print <<"EOF";
-    $src = fetchurl {
+    "$src" = fetchurl {
       url = "$urls{$src}";
       sha256 = "$sha256";
     };
@@ -68,8 +68,8 @@ in stdenv.mkDerivation {
   pname = "opam";
   version = "$OPAM_RELEASE";
 
-  nativeBuildInputs = [ unzip ];
-  buildInputs = [ curl ncurses ocaml makeWrapper getconf ] ++ lib.optional stdenv.isLinux bubblewrap;
+  nativeBuildInputs = [ makeWrapper unzip ];
+  buildInputs = [ curl ncurses ocaml getconf ] ++ lib.optional stdenv.isLinux bubblewrap;
 
   src = srcs.opam;
 
@@ -79,7 +79,7 @@ for my $src (sort keys %urls) {
   my($ext) = $urls{$src} =~ /(\.(?:t(?:ar\.|)|)(?:gz|bz2?))$/
     or die "could not find extension for $urls{$src}\n";
   print <<"EOF";
-    ln -sv \${srcs.$src} \$sourceRoot/src_ext/$src$ext
+    ln -sv \${srcs."$src"} \$sourceRoot/src_ext/$src$ext
 EOF
 }
 print <<'EOF';