diff --git a/nix/sources.json b/nix/sources.json
index eb53e17..0bbea08 100644
--- a/nix/sources.json
+++ b/nix/sources.json
@@ -1,26 +1,14 @@
 {
-    "niv": {
-        "branch": "master",
-        "description": "Easy dependency management for Nix projects",
-        "homepage": "https://github.com/nmattia/niv",
-        "owner": "nmattia",
-        "repo": "niv",
-        "rev": "50600603b51432839c4b6267fd6a0d00ae6b0451",
-        "sha256": "1rrhlscbqdn9a77ws49acl536n3mz6bai68z08mpg8qqa4ahr2sn",
-        "type": "tarball",
-        "url": "https://github.com/nmattia/niv/archive/50600603b51432839c4b6267fd6a0d00ae6b0451.tar.gz",
-        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
-    },
     "nixpkgs": {
-        "branch": "nixos-unstable-small",
+        "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-channels",
-        "rev": "0bffd2150e5bbd9671bf98817a72e87ae41bc0ed",
-        "sha256": "0fpaw3llszhwajh612skw5ia553isn88l33xkjxccgpcw8rhbyvs",
+        "rev": "22a3bf9fb9edad917fb6cd1066d58b5e426ee975",
+        "sha256": "089hqg2r2ar5piw9q5z3iv0qbmfjc4rl5wkx9z16aqnlras72zsa",
         "type": "tarball",
-        "url": "https://github.com/NixOS/nixpkgs-channels/archive/0bffd2150e5bbd9671bf98817a72e87ae41bc0ed.tar.gz",
+        "url": "https://github.com/NixOS/nixpkgs-channels/archive/22a3bf9fb9edad917fb6cd1066d58b5e426ee975.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "pypi2nix": {