diff --git a/Dockerfile b/Dockerfile
index 5ff4ebb..4f7317b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,4 @@
 FROM python:3.9-slim
-RUN pip install flask
 COPY . .
 ENV FLASK_APP=flaskr/hello
 EXPOSE 5000
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..e3e9a71
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1 @@
+Flask