--- a/Cargo.lock
+++ b/Cargo.lock
@@ -63,7 +63,7 @@
 [[package]]
 name = "clap"
 version = "3.0.0-beta.1"
-source = "git+https://github.com/clap-rs/clap?rev=48d308a8ab9e96d4b21336e428feee420dbac51d#48d308a8ab9e96d4b21336e428feee420dbac51d"
+source = "git+https://github.com/clap-rs/clap?rev=ddd55e57dc4b0205e02c121f1116704bd1b51956#ddd55e57dc4b0205e02c121f1116704bd1b51956"
 dependencies = [
  "atty",
  "bitflags",
@@ -81,7 +81,7 @@
 [[package]]
 name = "clap_derive"
 version = "3.0.0-beta.1"
-source = "git+https://github.com/clap-rs/clap?rev=48d308a8ab9e96d4b21336e428feee420dbac51d#48d308a8ab9e96d4b21336e428feee420dbac51d"
+source = "git+https://github.com/clap-rs/clap?rev=ddd55e57dc4b0205e02c121f1116704bd1b51956#ddd55e57dc4b0205e02c121f1116704bd1b51956"
 dependencies = [
  "heck",
  "proc-macro-error",
--- a/cmds/jrsonnet/Cargo.toml
+++ b/cmds/jrsonnet/Cargo.toml
@@ -22,4 +22,4 @@
 
 [dependencies.clap]
 git = "https://github.com/clap-rs/clap"
-rev = "48d308a8ab9e96d4b21336e428feee420dbac51d"
+rev = "ddd55e57dc4b0205e02c121f1116704bd1b51956"
--- a/crates/jrsonnet-cli/Cargo.toml
+++ b/crates/jrsonnet-cli/Cargo.toml
@@ -13,4 +13,4 @@
 
 [dependencies.clap]
 git = "https://github.com/clap-rs/clap"
-rev = "48d308a8ab9e96d4b21336e428feee420dbac51d"
+rev = "ddd55e57dc4b0205e02c121f1116704bd1b51956"
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,43 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1597053966,
+        "narHash": "sha256-f9lbPS/GJ1His8fsDqM6gfa8kSqREU4eKiMCS5hrKg4=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "ec20f52e2ff61e9c36c2b894b62fc1b4bd04c71b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1597057899,
+        "narHash": "sha256-U144beTNlMdersGcr49IGU2YP1HjeS3pT3+FbOXN7r8=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "32b46dd897ab2143a609988a04d87452f0bbef59",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,18 @@
+{
+  description = "Rust jsonnet implementation";
+
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+  inputs.flake-utils.url = "github:numtide/flake-utils";
+
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = nixpkgs.legacyPackages.${system};
+        jrsonnet = pkgs.rustPlatform.buildRustPackage rec {
+          pname = "jrsonnet";
+          version = "0.1.0";
+          src = self;
+          cargoSha256 = "13fc96lvcg8riv8s8k44nshyc9jj390x5wmizfplny8lrxcr14lk";
+        };
+      in { defaultPackage = jrsonnet; });
+}