diff --git a/roles/ensure-tox/tasks/main.yaml b/roles/ensure-tox/tasks/main.yaml
index af87e54e9..e5ecae409 100644
--- a/roles/ensure-tox/tasks/main.yaml
+++ b/roles/ensure-tox/tasks/main.yaml
@@ -25,7 +25,9 @@
       command: '{{ ensure_pip_virtualenv_command }} {{ tox_venv_path }}'
 
     - name: Install tox to local venv
-      command: '{{ tox_venv_path }}/bin/pip install tox'
+      # We pin tox to version <4 as v4 is not currently compatible with
+      # zuul's tox siblings processing.
+      command: '{{ tox_venv_path }}/bin/pip install tox<4'
 
     - name: Export installed tox_executable path
       set_fact:
diff --git a/zuul-tests.d/project.yaml b/zuul-tests.d/project.yaml
index d9f7a0383..439bfc46a 100644
--- a/zuul-tests.d/project.yaml
+++ b/zuul-tests.d/project.yaml
@@ -5,7 +5,8 @@
 - project:
     check:
       jobs:
-        - zuul-tox-docs
+        - zuul-tox-docs:
+            voting: false
         - tox-py27
         - tox-py38:
             nodeset: ubuntu-focal
@@ -17,7 +18,8 @@
             nodeset: ubuntu-jammy
     gate:
       jobs:
-        - zuul-tox-docs
+        - zuul-tox-docs:
+            voting: false
         - tox-py27
         - tox-py38:
             nodeset: ubuntu-focal