diff --git a/nix/sources.json b/nix/sources.json
index 5c20860..a1a8d56 100644
--- a/nix/sources.json
+++ b/nix/sources.json
@@ -1,14 +1,14 @@
 {
     "nixpkgs": {
-        "branch": "release-21.05",
+        "branch": "nixpkgs-unstable",
         "description": "Nix Packages collection",
         "homepage": "",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "5f244caea76105b63d826911b2a1563d33ff1cdc",
-        "sha256": "1xlgynfw9svy7nvh9nkxsxdzncv9hg99gbvbwv3gmrhmzc3sar75",
+        "rev": "bd4dffcdb7c577d74745bd1eff6230172bd176d5",
+        "sha256": "18zacrykj2k5x42d0grr7g1y7xhy5ppq7j0gm3lrghwflyrdkslj",
         "type": "tarball",
-        "url": "https://github.com/NixOS/nixpkgs/archive/5f244caea76105b63d826911b2a1563d33ff1cdc.tar.gz",
+        "url": "https://github.com/NixOS/nixpkgs/archive/bd4dffcdb7c577d74745bd1eff6230172bd176d5.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     }
 }