diff --git a/docker/lambda/lambda.Dockerfile b/docker/lambda/lambda.Dockerfile
index c1a44ae..ac0eadc 100644
--- a/docker/lambda/lambda.Dockerfile
+++ b/docker/lambda/lambda.Dockerfile
@@ -1,14 +1,15 @@
 FROM public.ecr.aws/docker/library/python:3.12.0-slim-bullseye
-COPY --from=public.ecr.aws/awsguru/aws-lambda-adapter:0.8.1 /lambda-adapter /opt/extensions/lambda-adapter
 
-# コピーしてrequirements.txtを作成
+# requirements-dev.lockからrequirements.txtを生成
 COPY requirements-dev.lock /tmp/requirements-dev.lock
 RUN sed '/^-e file:.*/d' /tmp/requirements-dev.lock > requirements.txt
 
+# アプリコードをコピーする前に依存パッケージをインストール
+COPY requirements.txt /app/requirements.txt
+RUN pip install --no-cache-dir -r /app/requirements.txt
+
+COPY --from=public.ecr.aws/awsguru/aws-lambda-adapter:0.8.1 /lambda-adapter /opt/extensions/lambda-adapter
 COPY . /app
 WORKDIR /app
 
-# requirements.txtをインストール
-RUN pip install -r requirements.txt --no-cache-dir
-
 CMD ["python", "src/app.py"]