diff --git a/Main.hs b/Main.hs
index fee63d3..fedafb0 100644
--- a/Main.hs
+++ b/Main.hs
@@ -1,6 +1,5 @@
 module Main where
 
-import Control.Concurrent.Async (mapConcurrently_)
 import Control.Monad
 import Data.ByteString.Lazy (ByteString)
 import Data.ByteString.Lazy qualified as L
@@ -54,7 +53,7 @@ handleArgs ["fetch"] = do
         , "546" -- NYC East Village
         , "452" -- Austin Seaholm
         ]
-  mapConcurrently_ (scrapeStore conn) stores
+  mapM_ (scrapeStore conn) stores
   printlog "done"
   changeCount <- SQL.totalChanges conn
   printlog $ "changed rows: " <> show changeCount
diff --git a/flake.nix b/flake.nix
index 453abbf..723d5f9 100644
--- a/flake.nix
+++ b/flake.nix
@@ -14,20 +14,21 @@
               nixpkgs-fmt haskellPackages.fourmolu nodePackages.sql-formatter
             ]}
             nixpkgs-fmt .
-            fourmolu --mode inplace --indentation=2 $(git ls-files '*.hs')
+            fourmolu --mode inplace $(git ls-files '*.hs')
             for file in $(git ls-files "*.sql"); do
               sql-formatter --fix $file
             done
           '';
         in
-        rec {
+        {
           inherit formatter;
           packages.default = pkgs.haskellPackages.callCabal2nix "traderjoes" ./. { };
-          devShells.default = with pkgs; mkShell {
-            inputsFrom = [ packages.default.env ];
-            packages = [
+          devShells.default = pkgs.mkShell {
+            inputsFrom = [ self.packages.${system}.default.env ];
+            packages = with pkgs; [
               cabal-install
               haskell-language-server
+              haskellPackages.fourmolu
               hlint
               nodePackages.wrangler
               sqlite
diff --git a/fourmolu.yaml b/fourmolu.yaml
new file mode 100644
index 0000000..47e652d
--- /dev/null
+++ b/fourmolu.yaml
@@ -0,0 +1 @@
+indentation: 2