diff --git a/Makefile b/Makefile
index 04004cc..bca4433 100644
--- a/Makefile
+++ b/Makefile
@@ -76,15 +76,10 @@ show:
 switch:
 	nixos-rebuild switch $(options) --flake $(flake)
 
+# NOTE: Use `nix flake update <INPUT>` for selective update.
 update:
 	nix flake update
 
-updateMaster:
-	nix flake update nixpkgsMaster
-
-updateUnstable:
-	nix flake update nixpkgsUnstable
-
 verify: housekeep
 	git verify-commit HEAD
 	git fsck
diff --git a/flake.lock b/flake.lock
index 862e767..a936187 100644
--- a/flake.lock
+++ b/flake.lock
@@ -376,11 +376,11 @@
     },
     "nixpkgsUnstable": {
       "locked": {
-        "lastModified": 1737062831,
-        "narHash": "sha256-Tbk1MZbtV2s5aG+iM99U8FqwxU/YNArMcWAv6clcsBc=",
+        "lastModified": 1737469691,
+        "narHash": "sha256-nmKOgAU48S41dTPIXAq0AHZSehWUn6ZPrUKijHAMmIk=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "5df43628fdf08d642be8ba5b3625a6c70731c19c",
+        "rev": "9e4d5190a9482a1fb9d18adf0bdb83c6e506eaab",
         "type": "github"
       },
       "original": {