diff --git a/tox/Dockerfile b/tox/Dockerfile
index 4938559..b52ce1c 100644
--- a/tox/Dockerfile
+++ b/tox/Dockerfile
@@ -1,11 +1,11 @@
 ARG REGISTRY=swh-jenkins
 FROM $REGISTRY/base
 LABEL maintainer="SoftwareHeritage"
 USER root
 
 USER jenkins
 
 RUN python3 -m pip install --user --upgrade \
-  pip setuptools tox wheel twine
+  pip setuptools wheel twine tox detox
 RUN python3 -m pip install --user --no-warn-script-location \
   Radon pylint coverage codespell pyarcanist