diff --git a/nix/sources.json b/nix/sources.json
index c6bd6ef..6ffa2e1 100644
--- a/nix/sources.json
+++ b/nix/sources.json
@@ -24,15 +24,15 @@
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "nixpkgs": {
-        "branch": "release-20.03",
+        "branch": "nixpkgs-unstable",
         "description": "Nix Packages collection",
         "homepage": null,
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "1db42b7fe3878f3f5f7a4f2dc210772fd080e205",
-        "sha256": "05k9y9ki6jhaqdhycnidnk5zrdzsdammbk5lsmsbz249hjhhgcgh",
+        "rev": "278bcdce1f0da616661a6205161b13bd89a2f3bf",
+        "sha256": "0drsyr3f583yixkd28wavg6dg4zlmwjbnmhn9vbs9hbfxp1n395v",
         "type": "tarball",
-        "url": "https://github.com/NixOS/nixpkgs/archive/1db42b7fe3878f3f5f7a4f2dc210772fd080e205.tar.gz",
+        "url": "https://github.com/NixOS/nixpkgs/archive/278bcdce1f0da616661a6205161b13bd89a2f3bf.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     }
 }