diff --git a/default.nix b/default.nix
index 0b8daa5..b450610 100644
--- a/default.nix
+++ b/default.nix
@@ -1,4 +1,4 @@
-{ pkgs ? import <nixpkgs> { }, ocamlPackages ? pkgs.ocaml-ng.ocamlPackages_5_1
+{ pkgs ? import <nixpkgs> { }, ocamlPackages ? pkgs.ocaml-ng.ocamlPackages_latest
 , verbosity ? "warning" }:
 
 let