diff --git a/Dockerfile b/Dockerfile
index 1d67ff945..49668ba96 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,6 @@
 # Note: This image is also built in CircleCI, so limit references to internal repositories.
-FROM python:3.7
+### Build stage
+FROM python:3.7 AS builder
 
 # Create app directory
 WORKDIR /usr/src/app
@@ -12,4 +13,9 @@ COPY . /usr/src/app
 RUN pip install tox==3.15.0
 RUN pip install -r requirements.txt
 
+### Runtime stage
+FROM python:3.7
+COPY --from=builder /usr/src/app /usr/src/app
+WORKDIR /usr/src/app
+
 CMD ["make", "test"]