diff --git a/.github/workflows/mirror.yaml b/.github/workflows/mirror.yaml
new file mode 100644
index 00000000..eaf3e5b0
--- /dev/null
+++ b/.github/workflows/mirror.yaml
@@ -0,0 +1,24 @@
+# Mirror master to main branches in the mobx.dart repository.
+on:
+  push:
+    branches:
+      - 'main'
+
+# Declare default permissions as read only.
+permissions: read-all
+
+jobs:
+  mirror_job:
+    permissions:
+      pull-requests: write
+    runs-on: ubuntu-latest
+    if: ${{ github.repository == 'mobxjs/mobx.dart' }}
+    name: Mirror main branch to master branch
+    steps:
+      - name: Mirror action step
+        id: mirror
+        uses: google/mirror-branch-action@30c52ee21f5d3bd7fb28b95501c11aae7f17eebb # v2.0
+        with:
+          github-token: ${{ secrets.FLUTTERMIRRORINGBOT_TOKEN }}
+          source: 'main'
+          dest: 'master'
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