diff --git a/.github/workflows/dart.yml b/.github/workflows/dart.yml
new file mode 100644
index 00000000..b4b61643
--- /dev/null
+++ b/.github/workflows/dart.yml
@@ -0,0 +1,38 @@
+# This workflow uses actions that are not certified by GitHub.
+# They are provided by a third-party and are governed by
+# separate terms of service, privacy policy, and support
+# documentation.
+
+name: Dart
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+
+      # Note: This workflow uses the latest stable version of the Dart SDK.
+      # You can specify other versions if desired, see documentation here:
+      # https://github.com/dart-lang/setup-dart/blob/main/README.md
+      # - uses: dart-lang/setup-dart@v1
+      - uses: dart-lang/setup-dart@9a04e6d73cca37bd455e0608d7e5092f881fd603
+
+      - name: Install dependencies
+        run: dart pub get
+
+      # Uncomment this step to verify the use of 'dart format' on each commit.
+      # - name: Verify formatting
+      #   run: dart format --output=none --set-exit-if-changed .
+
+      # Consider passing '--fatal-infos' for slightly stricter analysis.
+      - name: Analyze project source
+        run: dart analyze
+
+
diff --git a/README.en-US.md b/README.en-US.md
index a539f8b9..d1546d3b 100644
--- a/README.en-US.md
+++ b/README.en-US.md
@@ -39,6 +39,7 @@ An enterprise-class package of Flutter components for mobile applications.
 
 <img width="180" height="180" src="https://img.ljcdn.com/beike/zjz/bruno/1639125005085.png"  />       <img width="180" height="180" src="https://img.ljcdn.com/beike/zjz/bruno/1639125005077.png"  />
 
+If you cannot access the demo, you can directly watch [Overview](https://github.com/Nayuta403/bruno/blob/patch/demo/Overview.MP4) or download the [APK](https://github.com/Nayuta403/bruno/blob/patch/demo/bruno_1.0.0_1_release_develop_c801f2db_20211210034820.apk) file.
 
 ## Adapted version of Flutter
 
@@ -48,6 +49,7 @@ An enterprise-class package of Flutter components for mobile applications.
 | 1.0.0      | 1.22.4           |
 | 2.0.0      | 2.2.2            |
 
+> Attention although we have adapted version 2.2.2, support for null-safe is in the works. We'll keep you updated on github as soon as possible, so stay tuned to 🙂.
 
 
 ## Preparing for use
diff --git a/demo/Overview.MP4 b/demo/Overview.MP4
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diff --git a/demo/bruno_1.0.0_1_release_develop_c801f2db_20211210034820.apk b/demo/bruno_1.0.0_1_release_develop_c801f2db_20211210034820.apk
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index 00000000..dace1c63
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