diff --git a/flake-registry.json b/flake-registry.json
index 422f77675..ae94f1df2 100644
--- a/flake-registry.json
+++ b/flake-registry.json
@@ -7,7 +7,7 @@
             "uri": "github:tweag/nix/flakes"
         },
         "nixpkgs": {
-            "uri": "github:edolstra/nixpkgs/flake"
+            "uri": "github:edolstra/nixpkgs/release-19.03"
         }
     },
     "version": 1