diff --git a/.github/workflows/test-ci-release.yml b/.github/workflows/test-ci-release.yml
new file mode 100644
index 0000000000..f92fc5f4f7
--- /dev/null
+++ b/.github/workflows/test-ci-release.yml
@@ -0,0 +1,67 @@
+name: Test nix on 
+
+on:
+  push:
+    branches: [ feat/nix ]
+jobs:
+  release-ubuntu:
+    name: Build for Linux
+    runs-on: ubuntu-latest
+    env:
+      CARGO_TERM_COLOR: always
+    steps:
+      - uses: actions/checkout@v4
+      - uses: DeterminateSystems/nix-installer-action@v9
+      - name: build linux-musl
+        run: nix build -L .#fastn
+      - name: test the output binary
+        run: ldd result/bin/fastn
+        run: ./result/bin/fastn --version
+      # - name: Build-musl
+      #   run: |
+      #     echo "Building static binaries using ekidd/rust-musl-builder"
+      #     docker build -t fastn-build-image -f .github/Dockerfile .
+      #     docker run --name fastn-build fastn-build-image
+      #     mkdir -p out
+      #     docker cp fastn-build:/home/rust/src/target/x86_64-unknown-linux-musl/release/fastn out/
+      # - name: run fastn
+      #   run: out/fastn --version
+      # - uses: actions/upload-artifact@v4
+      #   with:
+      #     name: linux_musl_x86_64
+      #     path: out/fastn
+  release-windows:
+    name: Build for win 64
+    runs-on: ubuntu-latest
+    env:
+      CARGO_TERM_COLOR: always
+    steps:
+      - uses: actions/checkout@v4
+      - uses: DeterminateSystems/nix-installer-action@v9
+      - name: build mingwW64
+        run: nix build -L .#fastn-win
+      - name: test the output binary
+        # wine?
+        # run: ldd result/bin/fastn.exe
+        # run: ./result/bin/fastn.exe --version
+        run: ls result/bin/
+        run: file result/bin/fastn.exe
+        run: ldd result/bin/fastn.exe
+  release-macos:
+    name: Build for MacOS
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: DeterminateSystems/nix-installer-action@v9
+      - name: build mac
+        run: nix build -L .#fastn
+      - name: test the output binary on mac
+        run: ldd result/bin/fastn
+        run: ./result/bin/fastn --version
+      # - name: run fastn
+      #   run: ./target/release/fastn --version
+      # - uses: actions/upload-artifact@v4
+      #   with:
+      #     name: macos_x64_latest
+      #     path: |
+      #       target/release/fastn
diff --git a/fastn.nix b/fastn.nix
index 36e623d130..398b784783 100644
--- a/fastn.nix
+++ b/fastn.nix
@@ -1,9 +1,14 @@
 { rustPlatform, stdenv, pkg-config, lib, windows, openssl }:
+let
+  fastnCargo = builtins.fromTOML (builtins.readFile ./fastn/Cargo.toml);
+  version = fastnCargo.package.version;
+in 
 rustPlatform.buildRustPackage {
   name = "fastn";
-  version = "0.4.47";
+  inherit version;
   src = lib.cleanSource ./.;
-  doCheck = false;
+
+  doCheck = false; # set this to true to run cargo test
 
   nativeBuildInputs = [ pkg-config ];
 
diff --git a/flake.nix b/flake.nix
index 84e75362ed..8efb538412 100644
--- a/flake.nix
+++ b/flake.nix
@@ -2,6 +2,8 @@
   inputs = {
     flake-utils.url = "github:numtide/flake-utils";
 
+    # TODO: use nixpkgs/unstable when this is merged:
+    # https://github.com/NixOS/nixpkgs/pull/282798
     nixpkgs.url = "github:junjihashimoto/nixpkgs/feature/rust-dup";
   };