diff --git a/nix/sources.json b/nix/sources.json
index a1c11a7..399ad60 100644
--- a/nix/sources.json
+++ b/nix/sources.json
@@ -5,10 +5,10 @@
         "homepage": "",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "d2fc6856824cb87742177eefc8dd534bdb6c3439",
-        "sha256": "18nmpsna8lmqcmag2x0gfncd96rrvxgsgn4r7wyagdjymbhzmx2a",
+        "rev": "556ce9a40abde33738e6c9eac65f965a8be3b623",
+        "sha256": "1a6dk8iw1y76gyzars32iq7rlmm19k6437r4ajjga5rlr23ln16a",
         "type": "tarball",
-        "url": "https://github.com/NixOS/nixpkgs/archive/d2fc6856824cb87742177eefc8dd534bdb6c3439.tar.gz",
+        "url": "https://github.com/NixOS/nixpkgs/archive/556ce9a40abde33738e6c9eac65f965a8be3b623.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     }
 }