diff --git a/pkgs/development/ocaml-modules/dates_calc/default.nix b/pkgs/development/ocaml-modules/dates_calc/default.nix
index d577cd61664a..e1def37250e7 100644
--- a/pkgs/development/ocaml-modules/dates_calc/default.nix
+++ b/pkgs/development/ocaml-modules/dates_calc/default.nix
@@ -4,7 +4,7 @@
 
 buildDunePackage rec {
   pname = "dates_calc";
-  version = "0.0.4";
+  version = "0.0.6";
 
   minimalOCamlVersion = "4.11";
   duneVersion = "3";
@@ -13,7 +13,7 @@ buildDunePackage rec {
     owner = "catalalang";
     repo = "dates-calc";
     rev = version;
-    sha256 = "sha256-tpKOoPVXkg/k+NW5R8A4fGAKhdMn9UcqMogCjafJuw4=";
+    sha256 = "sha256-B4li8vIK6AnPXJ1QSJ8rtr+JOcy4+h5sc1SH97U+Vgw=";
   };
 
   propagatedBuildInputs = [];