diff --git a/.taskcluster.yml b/.taskcluster.yml
index b0511673e..b52f184c4 100644
--- a/.taskcluster.yml
+++ b/.taskcluster.yml
@@ -241,13 +241,13 @@ tasks:
                                 then: >
                                     cd /builds/worker/checkouts/src &&
                                     ln -s /builds/worker/artifacts artifacts &&
-                                    pip3 install -r requirements/base.txt &&
-                                    pip3 install --user --no-deps . &&
+                                    pip3 install --break-system-packages -r requirements/base.txt &&
+                                    pip3 install --break-system-packages --user --no-deps . &&
                                     ~/.local/bin/taskgraph action-callback
                                 else: >
                                     cd /builds/worker/checkouts/src &&
                                     ln -s /builds/worker/artifacts artifacts &&
-                                    pip3 install --user . &&
+                                    pip3 install --break-system-packages --user . &&
                                     ~/.local/bin/taskgraph decision
                                     --pushlog-id='0'
                                     --pushdate='0'