diff --git a/pkgs/development/ocaml-modules/zarith/default.nix b/pkgs/development/ocaml-modules/zarith/default.nix
index b260d946ce1e..c09b5a828f92 100644
--- a/pkgs/development/ocaml-modules/zarith/default.nix
+++ b/pkgs/development/ocaml-modules/zarith/default.nix
@@ -1,20 +1,24 @@
 { lib, stdenv, fetchFromGitHub
 , ocaml, findlib, pkg-config
 , gmp
+, version ? if lib.versionAtLeast ocaml.version "4.08" then "1.14" else "1.13"
 }:
 
 if lib.versionOlder ocaml.version "4.04"
 then throw "zarith is not available for OCaml ${ocaml.version}"
 else
 
-stdenv.mkDerivation rec {
+stdenv.mkDerivation (finalAttrs: {
   pname = "ocaml${ocaml.version}-zarith";
-  version = "1.13";
+  inherit version;
   src = fetchFromGitHub {
     owner = "ocaml";
     repo = "Zarith";
     rev = "release-${version}";
-    sha256 = "sha256-CNVKoJeO3fsmWaV/dwnUA8lgI4ZlxR/LKCXpCXUrpSg=";
+    hash = {
+      "1.13" = "sha256-CNVKoJeO3fsmWaV/dwnUA8lgI4ZlxR/LKCXpCXUrpSg=";
+      "1.14" = "sha256-xUrBDr+M8uW2KOy7DZieO/vDgsSOnyBnpOzQDlXJ0oE=";
+    }."${finalAttrs.version}";
   };
 
   nativeBuildInputs = [ pkg-config ocaml findlib ];
@@ -31,9 +35,9 @@ stdenv.mkDerivation rec {
   meta = with lib; {
     description = "Fast, arbitrary precision OCaml integers";
     homepage    = "https://github.com/ocaml/Zarith";
-    changelog   = "https://github.com/ocaml/Zarith/raw/${src.rev}/Changes";
+    changelog   = "https://github.com/ocaml/Zarith/raw/${finalAttrs.src.rev}/Changes";
     license     = licenses.lgpl2;
     inherit (ocaml.meta) platforms;
     maintainers = with maintainers; [ thoughtpolice vbgl ];
   };
-}
+})
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 27412bbac617..ddc797d4386c 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -9525,7 +9525,9 @@ with pkgs;
   last-resort = callPackage ../data/fonts/last-resort { };
 
   ligo =
-    let ocaml_p = ocaml-ng.ocamlPackages_4_14; in
+    let ocaml_p = ocaml-ng.ocamlPackages_4_14.overrideScope (self: super: {
+      zarith = super.zarith.override { version = "1.13"; };
+    }); in
     callPackage ../development/compilers/ligo {
     coq = coq_8_13.override {
       customOCamlPackages = ocaml_p;