diff --git a/flake.lock b/flake.lock
index a45cf2b..8d250d1 100644
--- a/flake.lock
+++ b/flake.lock
@@ -20,11 +20,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1715787315,
-        "narHash": "sha256-cYApT0NXJfqBkKcci7D9Kr4CBYZKOQKDYA23q8XNuWg=",
+        "lastModified": 1720031269,
+        "narHash": "sha256-rwz8NJZV+387rnWpTYcXaRNvzUSnnF9aHONoJIYmiUQ=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "33d1e753c82ffc557b4a585c77de43d4c922ebb5",
+        "rev": "9f4128e00b0ae8ec65918efeba59db998750ead6",
         "type": "github"
       },
       "original": {
@@ -63,11 +63,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1715940852,
-        "narHash": "sha256-wJqHMg/K6X3JGAE9YLM0LsuKrKb4XiBeVaoeMNlReZg=",
+        "lastModified": 1719887753,
+        "narHash": "sha256-p0B2r98UtZzRDM5miGRafL4h7TwGRC4DII+XXHDHqek=",
         "owner": "numtide",
         "repo": "treefmt-nix",
-        "rev": "2fba33a182602b9d49f0b2440513e5ee091d838b",
+        "rev": "bdb6355009562d8f9313d9460c0d3860f525bc6c",
         "type": "github"
       },
       "original": {
diff --git a/flake.nix b/flake.nix
index e5b0bcf..154ff00 100644
--- a/flake.nix
+++ b/flake.nix
@@ -19,7 +19,10 @@
         treefmt = treefmt-nix.lib.evalModule pkgs {
           projectRootFile = "flake.nix";
           programs = {
-            nixfmt.enable = true;
+            nixfmt = {
+              enable = true;
+              package = pkgs.nixfmt-classic;
+            };
             statix.enable = true;
             deadnix.enable = true;
             prettier.enable = true;