diff --git a/.github/workflows/Android.yml b/.github/workflows/Android.yml
index 2bbd807..847fa20 100644
--- a/.github/workflows/Android.yml
+++ b/.github/workflows/Android.yml
@@ -30,7 +30,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Set up JDK 17
         uses: actions/setup-java@v4
diff --git a/.github/workflows/Linux_arm64.yml b/.github/workflows/Linux_arm64.yml
index 6048319..d7d7068 100644
--- a/.github/workflows/Linux_arm64.yml
+++ b/.github/workflows/Linux_arm64.yml
@@ -30,7 +30,7 @@ jobs:
     
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Install dependency
         run: sudo apt-get update && sudo apt-get install -y libsdl2-dev
diff --git a/.github/workflows/Linux_arm64_AppImage.yml b/.github/workflows/Linux_arm64_AppImage.yml
index a400099..869a355 100644
--- a/.github/workflows/Linux_arm64_AppImage.yml
+++ b/.github/workflows/Linux_arm64_AppImage.yml
@@ -24,7 +24,7 @@ jobs:
     
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         
       - name: Install dependency
         run: sudo apt-get update && sudo apt-get install -y libsdl2-dev
diff --git a/.github/workflows/Linux_x86_64.yml b/.github/workflows/Linux_x86_64.yml
index 853f0f7..67f2d4b 100644
--- a/.github/workflows/Linux_x86_64.yml
+++ b/.github/workflows/Linux_x86_64.yml
@@ -30,7 +30,7 @@ jobs:
     
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Install dependency
         run: sudo apt-get update && sudo apt-get install -y libsdl2-dev
diff --git a/.github/workflows/Linux_x86_64_AppImage.yml b/.github/workflows/Linux_x86_64_AppImage.yml
index 1bbccd7..0ae0dc6 100644
--- a/.github/workflows/Linux_x86_64_AppImage.yml
+++ b/.github/workflows/Linux_x86_64_AppImage.yml
@@ -24,7 +24,7 @@ jobs:
     
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         
       - name: Install dependency
         run: sudo apt-get update && sudo apt-get install -y libsdl2-dev
diff --git a/.github/workflows/RaspberryPiOS_armhf.yml b/.github/workflows/RaspberryPiOS_armhf.yml
index 04600d3..e3bf38c 100644
--- a/.github/workflows/RaspberryPiOS_armhf.yml
+++ b/.github/workflows/RaspberryPiOS_armhf.yml
@@ -25,7 +25,7 @@ jobs:
     runs-on: ubuntu-22.04
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Switch apt sources to ports.ubuntu.com for armhf
         run: |
diff --git a/.github/workflows/Windows_x86_x64_arm64.yml b/.github/workflows/Windows_x86_x64_arm64.yml
index 9c550c2..430cc88 100644
--- a/.github/workflows/Windows_x86_x64_arm64.yml
+++ b/.github/workflows/Windows_x86_x64_arm64.yml
@@ -30,7 +30,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       # SDL2 のセットアップをキャッシュし、必要ならスクリプトで実行
       - name: Cache SDL2
diff --git a/.github/workflows/macOS_Universal.yml b/.github/workflows/macOS_Universal.yml
index 5940212..60d2756 100644
--- a/.github/workflows/macOS_Universal.yml
+++ b/.github/workflows/macOS_Universal.yml
@@ -30,7 +30,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Set up Xcode 16.4
         uses: maxim-lobanov/setup-xcode@v1