diff --git a/pkgs/development/ocaml-modules/zarith/default.nix b/pkgs/development/ocaml-modules/zarith/default.nix
index f9996eb6af6..175004c71bb 100644
--- a/pkgs/development/ocaml-modules/zarith/default.nix
+++ b/pkgs/development/ocaml-modules/zarith/default.nix
@@ -6,9 +6,9 @@
 let source =
   if stdenv.lib.versionAtLeast ocaml.version "4.02"
   then {
-    version = "1.10";
-    url = "https://github.com/ocaml/Zarith/archive/release-1.10.tar.gz";
-    sha256 = "1qxrl0v2mk9wghc1iix3n0vfz2jbg6k5wpn1z7p02m2sqskb0zhb";
+    version = "1.11";
+    url = "https://github.com/ocaml/Zarith/archive/release-1.11.tar.gz";
+    sha256 = "111n33flg4aq5xp5jfksqm4yyz6mzxx9ps9a4yl0dz8h189az5pr";
   } else {
     version = "1.3";
     url = "http://forge.ocamlcore.org/frs/download.php/1471/zarith-1.3.tgz";