diff --git a/.github/workflows/licenses.yml b/.github/workflows/licenses.yml
new file mode 100644
index 0000000..b5e42ed
--- /dev/null
+++ b/.github/workflows/licenses.yml
@@ -0,0 +1,21 @@
+name: Update License File
+on:
+  push:
+    branches: [ main ]
+    paths:
+      - 'go.mod'
+      - 'go.sum'
+
+jobs:
+  update-licenses:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version: '1.23'
+      - name: Install go-licenses
+        run: go install github.com/google/go-licenses@latest
+      - name: Generate license files
+        run: |
+          go-licenses report github.com/emmansun/gmsm > third-party-licenses.md