diff --git a/.github/workflows/s3_conversion.yaml b/.github/workflows/s3_conversion.yaml
index d062ebd8..cfc5ad61 100644
--- a/.github/workflows/s3_conversion.yaml
+++ b/.github/workflows/s3_conversion.yaml
@@ -32,13 +32,13 @@ jobs:
 
       - uses: actions/setup-python@v5
 
-      - uses: actions/cache@v4
+      - uses: actions/cache@9255dc7a253b0ccc959486e2bca901246202afeb # v5
         with:
           path: ~/.cache/pip
           key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
 
       # SAMビルドのキャッシュ
-      - uses: actions/cache@v4
+      - uses: actions/cache@9255dc7a253b0ccc959486e2bca901246202afeb # v5
         with:
           path: .aws-sam/build
           key: ${{ runner.os }}-sam-build-${{ hashFiles('**/*.py') }}