diff --git a/nix/base-system/flake.lock b/nix/base-system/flake.lock
index 12d2ba2..6ca04b6 100644
--- a/nix/base-system/flake.lock
+++ b/nix/base-system/flake.lock
@@ -467,11 +467,11 @@
         "systems": "systems_7"
       },
       "locked": {
-        "lastModified": 1726560853,
-        "narHash": "sha256-X6rJYSESBVr3hBoH0WbKE5KvhPU5bloyZ2L4K60/fPQ=",
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
         "owner": "numtide",
         "repo": "flake-utils",
-        "rev": "c1dfcf08411b08f6b8615f7d8971a2bfa81d5e8a",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
         "type": "github"
       },
       "original": {
@@ -618,11 +618,11 @@
         "rust-overlay": "rust-overlay_5"
       },
       "locked": {
-        "lastModified": 1732123224,
-        "narHash": "sha256-ak/hxe4VaBnNSHfaRanGivVdtxgSHdFd2ifXZ54QePo=",
+        "lastModified": 1737911819,
+        "narHash": "sha256-EsxRZIwe1EaacXj3yp1xo2pqHufr/ZLaqOPnsOmEmI0=",
         "owner": "martinvonz",
         "repo": "jj",
-        "rev": "ac0e531de5b0dc609562c34f9f1ab8558ea8a4cd",
+        "rev": "00069119d8165c9c9b3b176c00c3171c73c05138",
         "type": "github"
       },
       "original": {
@@ -1107,16 +1107,18 @@
     },
     "nixpkgs_9": {
       "locked": {
-        "lastModified": 1728538411,
-        "narHash": "sha256-f0SBJz1eZ2yOuKUr5CA9BHULGXVSn6miBuUWdTyhUhU=",
+        "lastModified": 1737557748,
+        "narHash": "sha256-BaMuhctP1x00+8cBE2cJveJQb70/tWHI50MHj/ZrtOY=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "b69de56fac8c2b6f8fd27f2eca01dcda8e0a4221",
+        "rev": "606996d74f6e2a12635d41c1bf58bfc7ea3bb5ec",
         "type": "github"
       },
       "original": {
-        "id": "nixpkgs",
-        "type": "indirect"
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
       }
     },
     "nurl-flake": {
@@ -1354,11 +1356,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1729304879,
-        "narHash": "sha256-H7KGGJUU9BcDNnfXiATBGgs6FJKWQdfftNJS+/v2aMU=",
+        "lastModified": 1737685583,
+        "narHash": "sha256-p+NVABRpGi+pT+xxf9HcLcFVxG6L+vEEy+NwzB9T0f8=",
         "owner": "oxalica",
         "repo": "rust-overlay",
-        "rev": "b259ef799b5ac014604da71ecd92d4a52603ed2d",
+        "rev": "eb64cbcc8eee0fa87ebded92805280d2ec97415a",
         "type": "github"
       },
       "original": {
@@ -1421,15 +1423,16 @@
         "rust-overlay": "rust-overlay_7"
       },
       "locked": {
-        "lastModified": 1733525038,
-        "narHash": "sha256-4ECXJND/pbQlTeqZEQOVUcoqC0d6PfAKNGMWavwYXGA=",
+        "lastModified": 1736294704,
+        "narHash": "sha256-YgMv21vs7nYgyclya3XK024NpVi/l1EkgoBZGtFcXvg=",
         "owner": "zaphar",
         "repo": "sheetsui",
-        "rev": "ffc5df157b90fd087ddea98e307178c6f4142dfc",
+        "rev": "d50c12a5bab588e0c08c0a046143b98701bb3ca9",
         "type": "github"
       },
       "original": {
         "owner": "zaphar",
+        "ref": "main",
         "repo": "sheetsui",
         "type": "github"
       }
diff --git a/nix/base-system/flake.nix b/nix/base-system/flake.nix
index 99b9190..f99d913 100644
--- a/nix/base-system/flake.nix
+++ b/nix/base-system/flake.nix
@@ -13,7 +13,7 @@
       # ensure that darwinSystem uses our nixpkgs version
       inputs.nixpkgs.follows = "nixpkgs-darwin";
     };
-    sheetsui-flake.url = "github:zaphar/sheetsui";
+    sheetsui-flake.url = "github:zaphar/sheetsui/main";
     sile-flake.url = "github:sile-typesetter/sile";
     durnitisp-flake.url = "github:zaphar/durnitisp";
     runwhen-flake.url = "github:zaphar/runwhen";