diff --git a/.circleci/config.yml b/.circleci/config.yml
index 765eaa2..1b81083 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -3,7 +3,7 @@ jobs: # A basic unit of work in a run
   build: # runs not using Workflows must have a `build` job as entry point 
     docker: # run the steps with Docker
       # CircleCI Python images available at: https://hub.docker.com/r/circleci/python/
-      - image: circleci/python:3.9
+      - image: circleci/python:3.7
         auth:
           username: mydockerhub-user
           password: $DOCKERHUB_PASSWORD  # context / project UI env-var reference
@@ -21,7 +21,7 @@ jobs: # A basic unit of work in a run
     steps: # steps that comprise the `build` job
       - checkout # check out source code to working directory
       - run: sudo chown -R circleci:circleci /usr/local/bin
-      - run: sudo chown -R circleci:circleci /usr/local/lib/python3.9/site-packages
+      - run: sudo chown -R circleci:circleci /usr/local/lib/python3.7/site-packages
       - restore_cache:
       # Read about caching dependencies: https://circleci.com/docs/2.0/caching/
           key: deps9-{{ .Branch }}-{{ checksum "Pipfile.lock" }}