diff --git a/.envrc b/.envrc
new file mode 100644
index 0000000000..4a4726a5c7
--- /dev/null
+++ b/.envrc
@@ -0,0 +1 @@
+use_nix
diff --git a/shell.nix b/shell.nix
new file mode 100644
index 0000000000..a734f66572
--- /dev/null
+++ b/shell.nix
@@ -0,0 +1,5 @@
+{ pkgs ? import <nixpkgs> {}}:
+
+pkgs.python37Packages.trio.overrideAttrs (oldAttrs: {
+  src = ./.;
+})