diff --git a/nix/sources.json b/nix/sources.json
index ed0301e..f432124 100644
--- a/nix/sources.json
+++ b/nix/sources.json
@@ -86,10 +86,10 @@
         "homepage": "https://github.com/NixOS/nixpkgs",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "8c50662509100d53229d4be607f1a3a31157fa12",
-        "sha256": "15a6a3v4wlb94qa6cqfn11vpjhyall4ycbj171al5lk2l48nca6r",
+        "rev": "a633d89c6dc9a2a8aae11813a62d7c58b2c0cc51",
+        "sha256": "0k8dbsqck7s24d5y33s0j17fhq3g3zn9d6g2cnd8q0jm8c1qj611",
         "type": "tarball",
-        "url": "https://github.com/NixOS/nixpkgs/archive/8c50662509100d53229d4be607f1a3a31157fa12.tar.gz",
+        "url": "https://github.com/NixOS/nixpkgs/archive/a633d89c6dc9a2a8aae11813a62d7c58b2c0cc51.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "nixpkgsUnstable": {