diff --git a/.circleci/config.yml b/.circleci/config.yml
index 796b2810..24b7bb68 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -13,7 +13,7 @@ workflows:
 jobs:
   test-3.6: &test-template
     docker:
-      - image: circleci/python:3.6.6
+      - image: circleci/python:3.6-buster
 
     working_directory: ~/repo
 
@@ -44,4 +44,4 @@ jobs:
   test-3.7:
     <<: *test-template
     docker:
-      - image: circleci/python:3.7.1
+      - image: circleci/python:3.7-buster