diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
new file mode 100644
index 0000000..b96cc86
--- /dev/null
+++ b/.github/workflows/ci.yaml
@@ -0,0 +1,20 @@
+name: "CI"
+on:
+  # Run only when pushing to master branch, and making PRs
+  push:
+    branches:
+      - master
+  pull_request:
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+    steps:
+      - uses: actions/checkout@v4
+      - uses: DeterminateSystems/nix-installer-action@main
+      - name: Install omnix
+        run: nix profile install nixpkgs#omnix
+      - name: Build all flake outputs
+        run: om ci run