diff --git a/flake.lock b/flake.lock
index 027e33f..d643bfb 100644
--- a/flake.lock
+++ b/flake.lock
@@ -3,14 +3,16 @@
     "dns": {
       "inputs": {
         "flake-utils": "flake-utils",
-        "nixpkgs": "nixpkgs"
+        "nixpkgs": [
+          "nixpkgs"
+        ]
       },
       "locked": {
-        "lastModified": 1737653493,
-        "narHash": "sha256-qTbv8Pm9WWF63M5Fj0Od9E54/lsbMSQUBHw/s30eFok=",
+        "lastModified": 1768143854,
+        "narHash": "sha256-E5/kyPz4zAZn/lZdvqlF83jMgCWNxmqYjjWuadngCbk=",
         "owner": "nix-community",
         "repo": "dns.nix",
-        "rev": "96e548ae8bd44883afc5bddb9dacd0502542276d",
+        "rev": "a97cf4156e9f044fe4bed5be531061000dfabb07",
         "type": "github"
       },
       "original": {
@@ -36,26 +38,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1616989418,
-        "narHash": "sha256-LcOn5wHR/1JwClfY/Ai/b+pSRY+d23QtIPQHwPAyHHI=",
+        "lastModified": 1768701115,
+        "narHash": "sha256-kkRg+hOTrRye6nDf6WBG8Ue7/ETUhfXdFSIVEXV2XXo=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "9d8e05e088ad91b7c62886a2175f38bfa443db2c",
-        "type": "github"
-      },
-      "original": {
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "type": "github"
-      }
-    },
-    "nixpkgs_2": {
-      "locked": {
-        "lastModified": 1739776882,
-        "narHash": "sha256-PAiogZP1rLOwSkoL8eNgnbcobe5AqIq+Zc8A9NNFv+A=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "1ead14e49dfa47e91e68df64ef3dbf036809c742",
+        "rev": "a48c9dbce9a434f3647d4d9eab783eca11a242c4",
         "type": "github"
       },
       "original": {
@@ -68,7 +55,7 @@
     "root": {
       "inputs": {
         "dns": "dns",
-        "nixpkgs": "nixpkgs_2"
+        "nixpkgs": "nixpkgs"
       }
     }
   },
diff --git a/flake.nix b/flake.nix
index e634000..1d762ad 100644
--- a/flake.nix
+++ b/flake.nix
@@ -4,6 +4,7 @@
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable-small";
     dns.url = "github:nix-community/dns.nix";
+    dns.inputs.nixpkgs.follows = "nixpkgs";
   };
 
   outputs =
diff --git a/zones/reverse-ipv6.nix b/zones/reverse-ipv6.nix
index 67b2a66..e2b556b 100644
--- a/zones/reverse-ipv6.nix
+++ b/zones/reverse-ipv6.nix
@@ -21,13 +21,13 @@ let
       nibbleCount = builtins.foldl' builtins.add 0 (map builtins.stringLength parts);
       zeros = lib.concatStrings (builtins.genList (i: "0") (32 - nibbleCount));
     in
-    lib.replaceStrings [ "XXXX" ] [ zeros ] addr;
+    lib.replaceString "XXXX" zeros addr;
 
   # Translate an IPv6 address (e.g. 2001:700:300:1900::1) into the fully expanded 20010700030019000000000000000001
   normalizev6 =
     addr:
     (lib.pipe addr [
-      (lib.replaceStrings [ "::" ] [ ":XXXX:" ])
+      (lib.replaceString "::" ":XXXX:")
       (lib.splitString ":")
       (map padTo4)
       (map (lib.splitString ""))