diff --git a/flake.lock b/flake.lock
index bf3844e..1d1813c 100644
--- a/flake.lock
+++ b/flake.lock
@@ -1,35 +1,47 @@
 {
   "nodes": {
-    "fenix": {
-      "inputs": {
-        "nixpkgs": "nixpkgs",
-        "rust-analyzer-src": "rust-analyzer-src"
-      },
+    "crate2nix": {
+      "flake": false,
       "locked": {
-        "lastModified": 1670566996,
-        "narHash": "sha256-M+KsSE2D8ByDf3HZhnvLRpytg8aXScoWhg+NrdHjeeE=",
-        "owner": "nix-community",
-        "repo": "fenix",
-        "rev": "ab24d0ad17a733624b99f5d6466e71b8c239a001",
+        "lastModified": 1668031227,
+        "narHash": "sha256-WSiooiJ2gtQGkZE0JBJkkqVz5wi3SETwygU4NuBHdgw=",
+        "owner": "kolloch",
+        "repo": "crate2nix",
+        "rev": "ad27c9f88eca7fcbaaa25194d51787715041ec30",
         "type": "github"
       },
       "original": {
-        "owner": "nix-community",
-        "repo": "fenix",
+        "owner": "kolloch",
+        "repo": "crate2nix",
+        "type": "github"
+      }
+    },
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1659877975,
+        "narHash": "sha256-zllb8aq3YO3h8B/U0/J1WBgAL8EX5yWf5pMj3G0NAmc=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "c0e246b9b83f637f4681389ecabcb2681b4f3af0",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
         "type": "github"
       }
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1670332253,
-        "narHash": "sha256-O5SmhlIUt1s+vK4NXeGYqwcBIMwbBPAEZ3GHE3XT28c=",
-        "owner": "nixos",
+        "lastModified": 1667991831,
+        "narHash": "sha256-DHgEsLZI044B9T4AjA3K6+yB9/DqLr4dyA7OIx0FG7o=",
+        "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "1c9ffcf70786f0966982ce0fc76ec05df2e1dec2",
+        "rev": "872fceeed60ae6b7766cc0a4cd5bf5901b9098ec",
         "type": "github"
       },
       "original": {
-        "owner": "nixos",
+        "owner": "NixOS",
         "ref": "nixos-unstable",
         "repo": "nixpkgs",
         "type": "github"
@@ -37,41 +49,44 @@
     },
     "nixpkgs_2": {
       "locked": {
-        "lastModified": 1670507980,
-        "narHash": "sha256-riNZa0xzM1it3pzxciwALeMs+0CsBMWIW2FqulzK8vM=",
+        "lastModified": 1665296151,
+        "narHash": "sha256-uOB0oxqxN9K7XGF1hcnY+PQnlQJ+3bP2vCn/+Ru/bbc=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "2787fc7d1e51404678614bf0fe92fc296746eec0",
+        "rev": "14ccaaedd95a488dd7ae142757884d8e125b3363",
         "type": "github"
       },
       "original": {
         "owner": "NixOS",
-        "ref": "nixos-unstable",
+        "ref": "nixpkgs-unstable",
         "repo": "nixpkgs",
         "type": "github"
       }
     },
     "root": {
       "inputs": {
-        "fenix": "fenix",
-        "nixpkgs": "nixpkgs_2",
+        "crate2nix": "crate2nix",
+        "nixpkgs": "nixpkgs",
+        "rust-overlay": "rust-overlay",
         "utils": "utils"
       }
     },
-    "rust-analyzer-src": {
-      "flake": false,
+    "rust-overlay": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs_2"
+      },
       "locked": {
-        "lastModified": 1670426523,
-        "narHash": "sha256-Zh+pAuj4PmBmISXCz+54yVSwSXZwbn+ZELgM85xVUE0=",
-        "owner": "rust-lang",
-        "repo": "rust-analyzer",
-        "rev": "6e8a54d0f68702cf7981c8299357838eb0f4d5b2",
+        "lastModified": 1668048396,
+        "narHash": "sha256-SUWQlSa/H5XKPeuF9XmWzmwIJrgK42Lak6/1jBAwyd0=",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "rev": "859fefb532bb957f51a9b5e8e3ba2e48394c9353",
         "type": "github"
       },
       "original": {
-        "owner": "rust-lang",
-        "ref": "nightly",
-        "repo": "rust-analyzer",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
         "type": "github"
       }
     },
diff --git a/flake.nix b/flake.nix
index 8cf65b0..0ff9977 100644
--- a/flake.nix
+++ b/flake.nix
@@ -4,10 +4,14 @@
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
     utils.url = "github:numtide/flake-utils";
-    fenix.url = "github:nix-community/fenix";
+    rust-overlay.url = "github:oxalica/rust-overlay";
+    crate2nix = {
+      url = "github:kolloch/crate2nix";
+      flake = false;
+    };
   };
 
-  outputs = { self, nixpkgs, utils, fenix }: let
+  outputs = { self, nixpkgs, utils, rust-overlay, crate2nix }: let
     name = "transbeam";
   in
     utils.lib.eachDefaultSystem
@@ -15,13 +19,22 @@
         let
           pkgs = import nixpkgs {
             inherit system;
-            overlays = [ fenix.overlays.default ];
-          };
-          fenixStable = fenix.packages.${system}.stable;
-          fenixPlatform = pkgs.makeRustPlatform {
-            cargo = fenixStable.toolchain;
-            rustc = fenixStable.toolchain;
+            overlays = [
+              rust-overlay.overlays.default
+              (final: prev: {
+                rustc = final.rust-bin.stable.latest.default;
+                cargo = final.rust-bin.stable.latest.default;
+              })
+            ];
           };
+          inherit (import "${crate2nix}/tools.nix" { inherit pkgs; })
+            generatedCargoNix;
+          project = import
+            (generatedCargoNix {
+              inherit name;
+              src = ./.;
+            })
+            { inherit pkgs; };
         in rec {
           packages.${name} = pkgs.symlinkJoin {
             inherit name;
@@ -36,14 +49,7 @@
 
           defaultPackage = packages.${name};
 
-          packages."${name}-unwrapped" = let
-            cargoTOML = builtins.fromTOML (builtins.readFile ./Cargo.toml);
-          in fenixPlatform.buildRustPackage {
-            pname = name;
-            inherit (cargoTOML.package) version;
-            src = ./.;
-            cargoLock.lockFile = ./Cargo.lock;
-          };
+          packages."${name}-unwrapped" = project.rootCrate.build;
 
           packages."${name}-cli" = with pkgs.python3Packages; buildPythonApplication {
             pname = "${name}-cli";
@@ -55,18 +61,11 @@
             src = ./cli;
           };
 
-          devShell = with pkgs; let
-            fenixWith = fenixStable.withComponents [
-              "cargo"
-              "clippy"
-              "rust-src"
-              "rustc"
-              "rustfmt"
-            ];
-          in mkShell {
-            nativeBuildInputs = [
+          devShell = pkgs.mkShell {
+            nativeBuildInputs = with pkgs; [
               stdenv.cc
-              fenixWith
+              rustc
+              cargo
               cargo-audit
               cargo-flamegraph
               (python3.withPackages (p: with p; [
@@ -74,6 +73,7 @@
                 websockets
               ]))
             ];
+            RUST_SRC_PATH = "${pkgs.rust.packages.stable.rustPlatform.rustLibSrc}";
           };
         }
       );
diff --git a/src/zip.rs b/src/zip.rs
index d130eb4..e2772aa 100644
--- a/src/zip.rs
+++ b/src/zip.rs
@@ -395,7 +395,7 @@ mod tests {
             let mut zipgen = ZipGenerator::new(
                 FileSet {
                     files: vec![],
-                    directory_name: Some("test".to_owned()),
+                    directory_name: "test".to_owned(),
                 },
                 Box::new(std::io::Cursor::new(&mut output)),
             );