diff --git a/.circleci/config.yml b/.circleci/config.yml
index 3cce0fa..f3c50fb 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -20,6 +20,7 @@ jobs:
             /usr/local/bin/python -m pip install --upgrade pip
             apk update && apk add postgresql-dev gcc python3-dev musl-dev
             pip install -r requirements/dev.txt --user
+            pip install Flask
       - save_cache:
           key: deps9-{{ checksum "Pipfile.lock" }}
           paths: