diff --git a/.github/workflows/freebsd.yml b/.github/workflows/freebsd.yml
index 067aa56..c411aaa 100644
--- a/.github/workflows/freebsd.yml
+++ b/.github/workflows/freebsd.yml
@@ -11,7 +11,7 @@ jobs:
     runs-on: macos-12
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: make
       uses: vmactions/freebsd-vm@v0
       with:
diff --git a/.github/workflows/macos.yml b/.github/workflows/macos.yml
index 0b36233..ffe75b8 100644
--- a/.github/workflows/macos.yml
+++ b/.github/workflows/macos.yml
@@ -12,7 +12,7 @@ jobs:
     runs-on: macos-latest
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: make
       run: make
     - name: install check
diff --git a/.github/workflows/openbsd.yml b/.github/workflows/openbsd.yml
index 6ddef78..59a1e5c 100644
--- a/.github/workflows/openbsd.yml
+++ b/.github/workflows/openbsd.yml
@@ -11,7 +11,7 @@ jobs:
     runs-on: macos-12
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: make
       uses: vmactions/openbsd-vm@v0
       with:
diff --git a/.github/workflows/ubuntu.yml b/.github/workflows/ubuntu.yml
index 52c92d2..a684e9a 100644
--- a/.github/workflows/ubuntu.yml
+++ b/.github/workflows/ubuntu.yml
@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: make
       run: make
     - name: install check
@@ -25,7 +25,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - uses: nttld/setup-ndk@v1
       with:
         ndk-version: r21e
diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
index 49ec6f9..d702c28 100644
--- a/.github/workflows/windows.yml
+++ b/.github/workflows/windows.yml
@@ -15,7 +15,7 @@ jobs:
         shell: msys2 {0}
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - uses: msys2/setup-msys2@v2
       with:
         msystem: MINGW64