diff --git a/flake.lock b/flake.lock
index 8088101..d897580 100644
--- a/flake.lock
+++ b/flake.lock
@@ -313,15 +313,16 @@
         ]
       },
       "locked": {
-        "lastModified": 1719749022,
-        "narHash": "sha256-ddPKHcqaKCIFSFc/cvxS14goUhCOAwsM1PbMr0ZtHMg=",
+        "lastModified": 1719836491,
+        "narHash": "sha256-0kZeCwwYe51lN/9X2eCcBaAxFHeHTN1ieyuq/4UG8xg=",
         "owner": "numtide",
         "repo": "treefmt-nix",
-        "rev": "8df5ff62195d4e67e2264df0b7f5e8c9995fd0bd",
+        "rev": "e78a4ce2041d5179f84b9a91001d9d35e72d3d21",
         "type": "github"
       },
       "original": {
         "owner": "numtide",
+        "ref": "opentofu",
         "repo": "treefmt-nix",
         "type": "github"
       }
diff --git a/flake.nix b/flake.nix
index 1eff437..1cbf9a1 100644
--- a/flake.nix
+++ b/flake.nix
@@ -12,7 +12,7 @@
     flake-compat.url = "github:edolstra/flake-compat";
     flake-parts.url = "github:hercules-ci/flake-parts";
     flake-parts.inputs.nixpkgs-lib.follows = "nixpkgs";
-    treefmt-nix.url = "github:numtide/treefmt-nix";
+    treefmt-nix.url = "github:numtide/treefmt-nix/opentofu";
     treefmt-nix.inputs.nixpkgs.follows = "nixpkgs";
 
     nixos-mailserver = {
@@ -63,7 +63,7 @@
           {
             treefmt = {
               projectRootFile = ".git/config";
-              programs.hclfmt.enable = true;
+              programs.terraform.enable = true;
               programs.nixfmt-rfc-style.enable = true;
               settings.formatter.nixfmt-rfc-style.excludes = [
                 # generated files