diff --git a/Makefile b/Makefile
index 8aaefaf..8e0856a 100644
--- a/Makefile
+++ b/Makefile
@@ -27,4 +27,8 @@ promote:
 fmt:
 	dune build @fmt --auto-promote
 
+.PHONY: nix/opam-selection.nix
+nix/opam-selection.nix:
+	nix-shell -A resolve default.nix
+
 .PHONY: default install uninstall reinstall clean test
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..9cb1313
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,76 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1694529238,
+        "narHash": "sha256-zsNZZGTGnMOf9YpHKJqMSsa0dXbfmxeoJ7xHlrt+xmY=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "ff7b65b44d01cf9ba6a71320833626af21126384",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nix-filter": {
+      "locked": {
+        "lastModified": 1694857738,
+        "narHash": "sha256-bxxNyLHjhu0N8T3REINXQ2ZkJco0ABFPn6PIe2QUfqo=",
+        "owner": "numtide",
+        "repo": "nix-filter",
+        "rev": "41fd48e00c22b4ced525af521ead8792402de0ea",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "nix-filter",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1695732165,
+        "narHash": "sha256-dj/F0iQzyP0+fJ17uIwxywZh3zVdCJpMNzhYmo62yhY=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "d490800f0f2140bbd1ad5bb87fbb7c38ed36fc6f",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nix-filter": "nix-filter",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..3807833
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,32 @@
+{
+  description = "spawn Nix Flake";
+
+  inputs.nix-filter.url = "github:numtide/nix-filter";
+  inputs.flake-utils.url = "github:numtide/flake-utils";
+  inputs.nixpkgs.url = "github:nixos/nixpkgs";
+
+  outputs = { self, nixpkgs, flake-utils, nix-filter }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = nixpkgs.legacyPackages."${system}";
+        inherit (pkgs.ocamlPackages) buildDunePackage;
+      in
+      rec {
+        packages = rec {
+          default = spawn;
+          spawn = buildDunePackage {
+            pname = "spawn";
+            version = "n/a";
+            src = ./.;
+            duneVersion = "3";
+            propagatedBuildInputs = with pkgs.ocamlPackages; [ ];
+            checkInputs = with pkgs.ocamlPackages; [ ppx_expect ppx_bench ];
+            doCheck = true;
+          };
+        };
+        devShells.default = pkgs.mkShell {
+          inputsFrom = pkgs.lib.attrValues packages;
+          buildInputs = with pkgs.ocamlPackages; [ ocaml-lsp pkgs.ocamlformat_0_19_0 ];
+        };
+      });
+}