diff --git a/nix/sources.json b/nix/sources.json
index 1e5f7ac..871c354 100644
--- a/nix/sources.json
+++ b/nix/sources.json
@@ -54,16 +54,16 @@
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "nixpkgs": {
-        "branch": "nixos-21.05",
+        "branch": "nixos-21.11",
         "builtin": false,
         "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": "2949ed36539dcc6cd08e95b25d42e19ffab3d027",
-        "sha256": "1xg8wnqgmcb8gc58j09h4qjhqf21q21nkh3c8kkz9d7spbn12a9l",
+        "rev": "86453059bf8312f0f5bf1fe8a2f52da2be664489",
+        "sha256": "0inzy97dp5988cwjwpn41219rir4c7qp7wwg7v4abcs9lypg8is4",
         "type": "tarball",
-        "url": "https://github.com/NixOS/nixpkgs/archive/2949ed36539dcc6cd08e95b25d42e19ffab3d027.tar.gz",
+        "url": "https://github.com/NixOS/nixpkgs/archive/86453059bf8312f0f5bf1fe8a2f52da2be664489.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "nixpkgsUnstable": {