diff --git a/nix/sources.json b/nix/sources.json
index ccaabc48..c118a999 100644
--- a/nix/sources.json
+++ b/nix/sources.json
@@ -41,10 +41,10 @@
         "homepage": "",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "a640d8394f34714578f3e6335fc767d0755d78f9",
-        "sha256": "1dyyzgcmlhpsdb4ngiy8m0x10qmh0r56ky75r8ppvvh730m3lhfj",
+        "rev": "521e4d7d13b09bc0a21976b9d19abd197d4e3b1e",
+        "sha256": "156b4wnm6y6lg0gz09mp48rd0mhcdazr5s888c4lbhlpn3j8h042",
         "type": "tarball",
-        "url": "https://github.com/NixOS/nixpkgs/archive/a640d8394f34714578f3e6335fc767d0755d78f9.tar.gz",
+        "url": "https://github.com/NixOS/nixpkgs/archive/521e4d7d13b09bc0a21976b9d19abd197d4e3b1e.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "pre-commit-hooks": {