diff --git a/default.nix b/default.nix
index a552c74..496ddf3 100644
--- a/default.nix
+++ b/default.nix
@@ -18,8 +18,8 @@ let
   nixpkgs' = builtins.fetchGit {
     # A branch of Nixpkgs with a custom "crossSystem" mechanism
     url = "https://github.com/ehmry/nixpkgs.git";
-    ref = "hybrid";
-    rev = "3985d04b2cfe144beaf0fde58b2904763004197f";
+    ref = "hybrid-19.09";
+    rev = "9a704b7def9bc9ea04d12d6a0d55ebebe0af982a";
   };
 
 in { nixpkgs ? nixpkgs', dhall-haskell ? ./dhall-haskell.nix }: