diff --git a/.taskcluster.yml b/.taskcluster.yml
index ad56f93..d327636 100644
--- a/.taskcluster.yml
+++ b/.taskcluster.yml
@@ -207,7 +207,7 @@ tasks:
                                         ACTION_CALLBACK: '${action.cb_name}'
 
                           cache:
-                              "${trustDomain}-level-${level}-checkouts-sparse-v2": /builds/worker/checkouts
+                              "${trustDomain}-project-${project}-level-${level}-checkouts-sparse-v2": /builds/worker/checkouts/${project}
 
                           features:
                               taskclusterProxy: true
@@ -217,7 +217,7 @@ tasks:
 
                           command:
                               - run-task
-                              - '--${normProject}-checkout=/builds/worker/checkouts/src'
+                              - '--${normProject}-checkout=/builds/worker/checkouts/${project}/src'
                               - '--'
                               - bash
                               - -cx
@@ -226,12 +226,12 @@ tasks:
                                 in:
                                     $if: 'tasks_for == "action"'
                                     then: >
-                                        cd /builds/worker/checkouts/src &&
+                                        cd /builds/worker/checkouts/${project}/src &&
                                         ln -s /builds/worker/artifacts artifacts &&
                                         pip3 install -r requirements/base.txt &&
                                         ~/.local/bin/taskgraph action-callback
                                     else: >
-                                        cd /builds/worker/checkouts/src &&
+                                        cd /builds/worker/checkouts/${project}/src &&
                                         ln -s /builds/worker/artifacts artifacts &&
                                         ~/.local/bin/taskgraph decision
                                         --pushlog-id='0'
@@ -256,7 +256,7 @@ tasks:
                                   expires: {$fromNow: '1 year'}
                               'public/docker-contexts':
                                   type: 'directory'
-                                  path: '/builds/worker/checkouts/src/docker-contexts'
+                                  path: '/builds/worker/checkouts/${project}/src/docker-contexts'
                                   # This needs to be at least the deadline of the
                                   # decision task + the docker-image task deadlines.
                                   # It is set to a week to allow for some time for