diff --git a/.circleci/config.yml b/.circleci/config.yml
index e38fc219..762e92ed 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -3,6 +3,7 @@ workflows:
   version: 2
   test:
     jobs:
+      - test-3.5-buster
       - test-3.6-buster
       - test-3.7-buster
       - test-3.8-buster
@@ -36,6 +37,10 @@ jobs:
           command: |
             . cowrie-env/bin/activate
             PYTHONPATH=`pwd`/src trial cowrie
+  test-3.5-buster:
+    <<: *test-template
+    docker:
+      - image: circleci/python:3.5-buster
   test-3.6-buster:
     <<: *test-template
     docker: