diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d44d88f..f1f19d5 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -54,3 +54,17 @@ jobs:
       - name: Run C FFI smoketest under valgrind
         run: make valgrind
         working-directory: crates/client-ffi/examples/message-exchange
+
+  nix-build:
+    name: Nix Build
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v4
+      - uses: cachix/install-nix-action@v31
+        with:
+          extra_nix_config: |
+            experimental-features = nix-command flakes
+      - run: nix build --print-build-logs
diff --git a/flake.nix b/flake.nix
index a405586..9f5de6c 100644
--- a/flake.nix
+++ b/flake.nix
@@ -31,7 +31,7 @@
         {
           default = rustPlatform.buildRustPackage {
             pname = "libchat";
-            version = "0.1.0";
+            version = (builtins.fromTOML (builtins.readFile ./crates/client-ffi/Cargo.toml)).package.version;
             src = pkgs.lib.cleanSourceWith {
               src = ./.;
               filter = path: type:
@@ -48,9 +48,6 @@
 
             nativeBuildInputs = [ pkgs.perl pkgs.pkg-config pkgs.cmake ];
             buildType = "release";
-            # Override panic=abort from workspace Cargo.toml — incompatible with buildRustPackage
-            CARGO_PROFILE_RELEASE_PANIC = "unwind";
-            # Tests run in CI; some require network access unavailable in the Nix sandbox
             doCheck = false;
 
             postBuild = ''