diff --git a/nix/sources.json b/nix/sources.json
index cf8fffd..3a8c9c7 100644
--- a/nix/sources.json
+++ b/nix/sources.json
@@ -1,14 +1,14 @@
 {
     "nixpkgs": {
-        "branch": "master",
+        "branch": "nixos-unstable",
         "description": "A read-only mirror of NixOS/nixpkgs tracking the released channels. Send issues and PRs to",
         "homepage": "https://github.com/NixOS/nixpkgs",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "ae625d98cd44a87a6b434becef9d28bbb4433c51",
-        "sha256": "1cyqwv2ms210agx02wyq69nzx601xz70dpr8c8mz33632vnciscb",
+        "rev": "9816b99e71c3504b0b4c1f8b2e004148460029d4",
+        "sha256": "1dpz36i3vx0c1wmacrki0wsf30if8xq3bnj71g89rsbxyi87lhcm",
         "type": "tarball",
-        "url": "https://github.com/NixOS/nixpkgs/archive/ae625d98cd44a87a6b434becef9d28bbb4433c51.tar.gz",
+        "url": "https://github.com/NixOS/nixpkgs/archive/9816b99e71c3504b0b4c1f8b2e004148460029d4.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     }
 }