3 files changed, 6 insertions, 7 deletions
diff --git a/website/sandbox/learnpianochords/.envrc b/website/sandbox/learnpianochords/.envrc
new file mode 100644
index 000000000000..a4a62da526d3
--- /dev/null
+++ b/website/sandbox/learnpianochords/.envrc
@@ -0,0 +1,2 @@
+source_up
+use_nix
diff --git a/website/sandbox/learnpianochords/dir-locals.nix b/website/sandbox/learnpianochords/dir-locals.nix
deleted file mode 100644
index 498f4b5055f8..000000000000
--- a/website/sandbox/learnpianochords/dir-locals.nix
+++ /dev/null
@@ -1,3 +0,0 @@
-let
-  briefcase = import <briefcase> {};
-in briefcase.utils.nixBufferFromShell ./shell.nix
diff --git a/website/sandbox/learnpianochords/shell.nix b/website/sandbox/learnpianochords/shell.nix
index 1a9c967f7fea..00bb4b0b3edc 100644
--- a/website/sandbox/learnpianochords/shell.nix
+++ b/website/sandbox/learnpianochords/shell.nix
@@ -2,9 +2,9 @@ let
   briefcase = import <briefcase> {};
   pkgs = briefcase.third_party.pkgs;
 in pkgs.mkShell {
-  buildInputs = with pkgs; [
-    elmPackages.elm
-    elmPackages.elm-format
-    elmPackages.elm-live
+  buildInputs = with pkgs.elmPackages; [
+    elm
+    elm-format
+    elm-live
   ];
 }