--- a/taskcluster/taskgraph/transforms/task.py
+++ b/taskcluster/taskgraph/transforms/task.py
@@ -866,17 +866,17 @@ def build_docker_worker_payload(config, 
         # the run-task content into the cache name. However, doing so preserves
         # the mechanism whereby changing run-task results in new caches
         # everywhere.
 
         # As an additional mechanism to force the use of different caches, the
         # string literal in the variable below can be changed. This is
         # preferred to changing run-task because it doesn't require images
         # to be rebuilt.
-        cache_version = 'v1'
+        cache_version = 'v2'
 
         if run_task:
             suffix = '-%s-%s' % (cache_version, _run_task_suffix())
 
             if out_of_tree_image:
                 name_hash = hashlib.sha256(out_of_tree_image).hexdigest()
                 suffix += name_hash[0:12]