diff --git a/lambda/sap-data-decrypt/Dockerfile b/lambda/sap-data-decrypt/Dockerfile
index 329183b1..a850e222 100644
--- a/lambda/sap-data-decrypt/Dockerfile
+++ b/lambda/sap-data-decrypt/Dockerfile
@@ -4,7 +4,12 @@ ENV TZ="Asia/Tokyo"
 
 WORKDIR /function
 COPY requirements.txt ./
-RUN pip install --no-cache-dir -r requirements.txt
+RUN  \
+    apt update -y && \
+    # パッケージのセキュリティアップデートのみを適用するコマンド
+    apt install -y unattended-upgrades && \
+    unattended-upgrades && \
+    pip install --no-cache-dir -r requirements.txt
 COPY datadecrypt ./
 
 ENTRYPOINT [ "/usr/local/bin/python", "-m", "awslambdaric" ]