diff --git a/pkgs/development/ocaml-modules/posix/base.nix b/pkgs/development/ocaml-modules/posix/base.nix
index 6d0cd879d4e2..2b36a96f08f8 100644
--- a/pkgs/development/ocaml-modules/posix/base.nix
+++ b/pkgs/development/ocaml-modules/posix/base.nix
@@ -6,19 +6,17 @@
   integers,
 }:
 
-buildDunePackage rec {
+buildDunePackage (finalAttrs: {
   pname = "posix-base";
-  version = "2.2.0";
+  version = "4.0.2";
 
   src = fetchFromGitHub {
     owner = "savonet";
     repo = "ocaml-posix";
-    tag = "v${version}";
-    hash = "sha256-JKJIiuo4lW8DmcK1mJlT22784J1NS2ig860jDbRIjIo=";
+    tag = "v${finalAttrs.version}";
+    hash = "sha256-nBSIuz4WEnESlECdKujEcSxFOcSBFxW1zo7J/lT/lCY=";
   };
 
-  minimalOCamlVersion = "4.08";
-
   propagatedBuildInputs = [
     ctypes
     integers
@@ -30,4 +28,4 @@ buildDunePackage rec {
     license = lib.licenses.mit;
     maintainers = [ lib.maintainers.vbgl ];
   };
-}
+})
diff --git a/pkgs/development/ocaml-modules/posix/errno.nix b/pkgs/development/ocaml-modules/posix/errno.nix
new file mode 100644
index 000000000000..c91a0e02f17c
--- /dev/null
+++ b/pkgs/development/ocaml-modules/posix/errno.nix
@@ -0,0 +1,20 @@
+{
+  buildDunePackage,
+  posix-base,
+}:
+
+buildDunePackage {
+  pname = "posix-errno";
+
+  inherit (posix-base) version src;
+
+  propagatedBuildInputs = [
+    posix-base
+  ];
+
+  doCheck = true;
+
+  meta = posix-base.meta // {
+    description = "Posix-errno provides comprehensive errno handling";
+  };
+}
diff --git a/pkgs/development/ocaml-modules/posix/math2.nix b/pkgs/development/ocaml-modules/posix/math2.nix
index e60116f0dedd..62168e5710a1 100644
--- a/pkgs/development/ocaml-modules/posix/math2.nix
+++ b/pkgs/development/ocaml-modules/posix/math2.nix
@@ -1,7 +1,6 @@
 {
   buildDunePackage,
   posix-base,
-  unix-errno,
 }:
 
 buildDunePackage {
@@ -10,7 +9,6 @@ buildDunePackage {
 
   propagatedBuildInputs = [
     posix-base
-    unix-errno
   ];
 
   meta = posix-base.meta // {
diff --git a/pkgs/development/ocaml-modules/posix/socket.nix b/pkgs/development/ocaml-modules/posix/socket.nix
index 47d422b09322..f7b5fb473b02 100644
--- a/pkgs/development/ocaml-modules/posix/socket.nix
+++ b/pkgs/development/ocaml-modules/posix/socket.nix
@@ -1,4 +1,8 @@
-{ buildDunePackage, posix-base }:
+{
+  buildDunePackage,
+  posix-base,
+  dune-configurator,
+}:
 
 buildDunePackage {
   pname = "posix-socket";
@@ -7,6 +11,8 @@ buildDunePackage {
 
   minimalOCamlVersion = "4.12";
 
+  buildInputs = [ dune-configurator ];
+
   propagatedBuildInputs = [ posix-base ];
 
   doCheck = true;
diff --git a/pkgs/development/ocaml-modules/posix/time2.nix b/pkgs/development/ocaml-modules/posix/time2.nix
index 42906f67381a..ca38ba107945 100644
--- a/pkgs/development/ocaml-modules/posix/time2.nix
+++ b/pkgs/development/ocaml-modules/posix/time2.nix
@@ -3,7 +3,7 @@
   buildDunePackage,
   posix-base,
   posix-types,
-  unix-errno,
+  posix-errno,
 }:
 
 buildDunePackage {
@@ -14,7 +14,7 @@ buildDunePackage {
   propagatedBuildInputs = [
     posix-base
     posix-types
-    unix-errno
+    posix-errno
   ];
 
   doCheck = true;
diff --git a/pkgs/development/ocaml-modules/srt/default.nix b/pkgs/development/ocaml-modules/srt/default.nix
index 6cbcf20b1727..7275d6c6d11e 100644
--- a/pkgs/development/ocaml-modules/srt/default.nix
+++ b/pkgs/development/ocaml-modules/srt/default.nix
@@ -8,17 +8,17 @@
   ctypes-foreign,
 }:
 
-buildDunePackage rec {
+buildDunePackage (finalAttrs: {
   pname = "srt";
-  version = "0.3.3";
+  version = "0.3.4";
 
   minimalOCamlVersion = "4.12";
 
   src = fetchFromGitHub {
     owner = "savonet";
     repo = "ocaml-srt";
-    rev = "v${version}";
-    hash = "sha256-FVgOEBPYZz7SQ5c6mLAssDwY1NuXsV3ghP7OyLRd9Kw=";
+    tag = "v${finalAttrs.version}";
+    hash = "sha256-+1/TffqssRA9YR3KLfbAr/ZpDF5XUKw24gj4HWrhObU=";
   };
 
   buildInputs = [ dune-configurator ];
@@ -31,10 +31,10 @@ buildDunePackage rec {
   meta = {
     description = "OCaml bindings for the libsrt library";
     license = lib.licenses.gpl2Plus;
-    inherit (src.meta) homepage;
+    homepage = "https://github.com/savonet/ocaml-srt";
     maintainers = with lib.maintainers; [
       vbgl
       dandellion
     ];
   };
-}
+})
diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index cc7036327e32..385f9012a673 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -1746,6 +1746,8 @@ let
 
         posix-base = callPackage ../development/ocaml-modules/posix/base.nix { };
 
+        posix-errno = callPackage ../development/ocaml-modules/posix/errno.nix { };
+
         posix-math2 = callPackage ../development/ocaml-modules/posix/math2.nix { };
 
         posix-socket = callPackage ../development/ocaml-modules/posix/socket.nix { };