diff --git a/tests/const.py b/tests/const.py
index <HASH>..<HASH> 100644
--- a/tests/const.py
+++ b/tests/const.py
@@ -7,7 +7,7 @@
 # Requirements:
 # - Must contain /bin/bash (TestMain::test_*shell_override*)
 #
-DOCKER_IMAGE = 'debian:8.2'
+DOCKER_IMAGE = 'debian:10'
 
 # Alternate Docker image
 # This image is used for alternate tests (e.g. pulling) and should be small.
test: Update DOCKER_IMAGE to debian:<I>

Rationale:
- debian:<I> is old
- debian:<I> uses a v1 schema manifest
- debian:<I> is cached in Ubuntu:<I> GitHub actions image:
  <URL>