diff --git a/.github/workflows/flint.yaml b/.github/workflows/flint.yaml
index 1a903196..3bd7fe3a 100644
--- a/.github/workflows/flint.yaml
+++ b/.github/workflows/flint.yaml
@@ -16,7 +16,7 @@ jobs:
         working-directory: flint
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: dart-lang/setup-dart@v1
     - run: dart pub get
     - run: dart analyze
diff --git a/.github/workflows/stevia_integration_test.yaml b/.github/workflows/stevia_integration_test.yaml
index f442aa85..40f54c84 100644
--- a/.github/workflows/stevia_integration_test.yaml
+++ b/.github/workflows/stevia_integration_test.yaml
@@ -35,7 +35,7 @@ jobs:
       run:
         working-directory: stevia/example
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: actions/setup-java@v3
         with:
           distribution: 'temurin'
@@ -58,9 +58,9 @@ jobs:
       run:
         working-directory: stevia/example
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: subosito/flutter-action@v2.10.0
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: futureware-tech/simulator-action@v2
         with:
           model: 'iPhone 14'
diff --git a/.github/workflows/stevia_unit_test.yaml b/.github/workflows/stevia_unit_test.yaml
index 94afbe8d..baaffa8c 100644
--- a/.github/workflows/stevia_unit_test.yaml
+++ b/.github/workflows/stevia_unit_test.yaml
@@ -32,7 +32,7 @@ jobs:
         working-directory: stevia
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: subosito/flutter-action@v2.10.0
       - run: flutter pub get
       - run: flutter pub run build_runner build --delete-conflicting-outputs
diff --git a/.github/workflows/sugar_integration_test.yaml b/.github/workflows/sugar_integration_test.yaml
index 3f0747be..25222a4d 100644
--- a/.github/workflows/sugar_integration_test.yaml
+++ b/.github/workflows/sugar_integration_test.yaml
@@ -27,7 +27,7 @@ jobs:
       run:
         working-directory: sugar
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: dart-lang/setup-dart@v1
       - run: dart pub get
       - run: dart run coverage:test_with_coverage test ./integration_test/
@@ -42,7 +42,7 @@ jobs:
       run:
         working-directory: sugar
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: dart-lang/setup-dart@v1
       - run: dart pub get
       - run: chmod +x ./integration_test/src/time/zone/platform/platform_provider_test_macos.sh
@@ -58,7 +58,7 @@ jobs:
       run:
         working-directory: sugar
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: dart-lang/setup-dart@v1
       - run: dart pub get
       - run: chmod +x ./integration_test/src/time/zone/platform/platform_provider_test_linux.sh
@@ -74,7 +74,7 @@ jobs:
       run:
         working-directory: sugar
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: browser-actions/setup-chrome@v1
         with:
           chrome-version: stable
diff --git a/.github/workflows/sugar_publish.yaml b/.github/workflows/sugar_publish.yaml
index 05b634b3..5c026445 100644
--- a/.github/workflows/sugar_publish.yaml
+++ b/.github/workflows/sugar_publish.yaml
@@ -14,7 +14,7 @@ jobs:
         working-directory: sugar
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: dart-lang/setup-dart@v1
       - run: dart pub get
       - run: dart analyze --fatal-warnings
@@ -34,7 +34,7 @@ jobs:
       run:
         working-directory: sugar
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: dart-lang/setup-dart@v1
       - run: dart pub get
       - run: dart run coverage:test_with_coverage test ./integration_test/
@@ -49,7 +49,7 @@ jobs:
       run:
         working-directory: sugar
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: dart-lang/setup-dart@v1
       - run: dart pub get
       - run: chmod +x ./integration_test/src/time/zone/platform/platform_provider_test_macos.sh
@@ -65,7 +65,7 @@ jobs:
       run:
         working-directory: sugar
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: dart-lang/setup-dart@v1
       - run: dart pub get
       - run: chmod +x ./integration_test/src/time/zone/platform/platform_provider_test_linux.sh
@@ -81,7 +81,7 @@ jobs:
       run:
         working-directory: sugar
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: browser-actions/setup-chrome@v1
         with:
           chrome-version: stable
diff --git a/.github/workflows/sugar_unit_test.yaml b/.github/workflows/sugar_unit_test.yaml
index a38a7d19..122dab5d 100644
--- a/.github/workflows/sugar_unit_test.yaml
+++ b/.github/workflows/sugar_unit_test.yaml
@@ -32,7 +32,7 @@ jobs:
         working-directory: sugar
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: dart-lang/setup-dart@v1
       - run: dart pub get
       - run: dart analyze --fatal-warnings