diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e188bf9..a62c774 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: checkout
-        uses: actions/checkout@v1
+        uses: actions/checkout@v4
 
       - name: correct password but wrong key
         uses: ./
@@ -143,7 +143,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: checkout
-        uses: actions/checkout@v1
+        uses: actions/checkout@v4
 
       - name: pass environment
         uses: ./
@@ -219,7 +219,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: checkout
-        uses: actions/checkout@v1
+        uses: actions/checkout@v4
 
       - name: clone private repository
         uses: ./
@@ -238,7 +238,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: checkout
-        uses: actions/checkout@v1
+        uses: actions/checkout@v4
 
       - name: login GitHub Container Registry
         uses: ./
@@ -267,7 +267,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: checkout
-        uses: actions/checkout@v1
+        uses: actions/checkout@v4
 
       - name: switch to root user
         uses: ./
@@ -288,7 +288,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: checkout
-        uses: actions/checkout@v1
+        uses: actions/checkout@v4
 
       - name: Set up WARP
         uses: fscarmen/warp-on-actions@v1.1