diff --git a/devShell.nix b/devShell.nix
index 52ad096..8a91831 100644
--- a/devShell.nix
+++ b/devShell.nix
@@ -2,6 +2,7 @@
   perSystem =
     { pkgs
     , self'
+    , config
     , ...
     }: {
       devShells.default = pkgs.mkShell {
@@ -9,6 +10,8 @@
           pkgs.tea
           self'.packages.tea-create-pr
           self'.packages.merge-after-ci
+          # treefmt with config defined in ./flake-parts/formatting.nix
+          config.treefmt.build.wrapper
         ];
         shellHook = ''
           ln -sf ../../scripts/pre-commit "$(git rev-parse --show-toplevel)/.git/hooks/pre-commit"