diff --git a/flake.nix b/flake.nix
index d124aa37..34e4b7ed 100644
--- a/flake.nix
+++ b/flake.nix
@@ -94,9 +94,20 @@
       devShells = forAllSystems (system: {
         default = nixpkgsFor.${system}.mkShell {
           buildInputs = with nixpkgsFor.${system}; [
+            deadnix
             nixfmt-rfc-style
+            nodePackages.prettier
             ruby
             ruby.devdoc
+            rufo
+            shellcheck
+            shfmt
+            taplo
+            (pkgs.writeShellScriptBin "statix-fix" ''
+              for file in "''$@"; do
+                ${lib.getExe statix} fix "$file"
+              done
+            '')
             (python3.withPackages (pyPkgs: [
               pyPkgs.python-lsp-server
               pyPkgs.black
diff --git a/treefmt.toml b/treefmt.toml
index db6f8a1b..62ff599a 100644
--- a/treefmt.toml
+++ b/treefmt.toml
@@ -2,6 +2,15 @@
 command = "nixfmt"
 includes = ["*.nix"]
 
+[formatter.deadnix]
+command = "deadnix"
+options = ["--edit"]
+includes = ["*.nix"]
+
+[formatter.statix]
+command = "statix-fix"
+includes = ["*.nix"]
+
 [formatter.black]
 command = "black"
 includes = ["*.py", "*.pyi"]
@@ -9,3 +18,45 @@ includes = ["*.py", "*.pyi"]
 [formatter.isort]
 command = "isort"
 includes = ["*.py", "*.pyi"]
+
+[formatter.taplo]
+command = "taplo"
+options = ["format"]
+includes = ["*.toml"]
+
+[formatter.shellcheck]
+command = "shellcheck"
+includes = ["*.sh", "*.bash", "*.envrc", "*.envrc.*"]
+priority = 0
+
+[formatter.shfmt]
+command = "shfmt"
+options = [
+  "--write",
+  "--simplify",
+  "--indent=2",
+  "--binary-next-line",
+  "--case-indent",
+  "--space-redirects",
+  "--apply-ignore",
+]
+includes = ["*.sh", "*.bash", "*.envrc", "*.envrc.*"]
+priority = 1
+
+[formatter.rufo]
+command = "rufo"
+options = ["--simple-exit"]
+includes = [
+  "*.rb",
+  "*.arb",
+  "*.rbx",
+  "*.rbw",
+  "*.gemfile",
+  "*.gemspec",
+  "*.ruby",
+]
+
+[formatter.prettier]
+command = "prettier"
+options = ["--write"]
+includes = ["*.css", "*.json", "*.md", "*.yml"]