diff --git a/nix/sources.json b/nix/sources.json
index d23d445..25f09a4 100644
--- a/nix/sources.json
+++ b/nix/sources.json
@@ -12,15 +12,15 @@
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "nixpkgs": {
-        "branch": "nixos-21.05",
+        "branch": "nixos-unstable",
         "description": "Nix Packages collection",
         "homepage": "",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "70904d4a9927a4d6e05c72c4aaac4370e05107f3",
-        "sha256": "08vvir0npyrdx85ypiannwzvyryqdw3749bghffhdsq2dgz1cx8z",
+        "rev": "34ad3ffe08adfca17fcb4e4a47bb5f3b113687be",
+        "sha256": "02li241rz5668nfyp88zfjilxf0mr9yansa93fbl38hjwkhf3ix6",
         "type": "tarball",
-        "url": "https://github.com/NixOS/nixpkgs/archive/70904d4a9927a4d6e05c72c4aaac4370e05107f3.tar.gz",
+        "url": "https://github.com/NixOS/nixpkgs/archive/34ad3ffe08adfca17fcb4e4a47bb5f3b113687be.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     }
 }