diff --git a/pkgs/development/ocaml-modules/janestreet/0.15.nix b/pkgs/development/ocaml-modules/janestreet/0.15.nix
index 3c5d939ad38..5ced2323ea7 100644
--- a/pkgs/development/ocaml-modules/janestreet/0.15.nix
+++ b/pkgs/development/ocaml-modules/janestreet/0.15.nix
@@ -248,7 +248,8 @@ with self;
 
   core = janePackage {
     pname = "core";
-    hash = "1m2ybvlz9zlb2d0jc0j7wdgd18mx9sh3ds2ylkv0cfjx1pzi0l25";
+    version = "0.15.1";
+    hash = "sha256-SHjnNFl+JAjdgVoRgmnz0wqrrc3zoh0ZyG2UhUsUbJ8=";
     meta.description = "Industrial strength alternative to OCaml's standard library";
     buildInputs = [ jst-config ];
     propagatedBuildInputs = [ base base_bigstring base_quickcheck ppx_jane time_now ];