diff --git a/sphinx/Dockerfile b/sphinx/Dockerfile
index 65acb09..73bf458 100644
--- a/sphinx/Dockerfile
+++ b/sphinx/Dockerfile
@@ -1,18 +1,19 @@
 ARG REGISTRY=swh-jenkins
 FROM $REGISTRY/base
 
 USER root
 RUN DEBIAN_FRONTEND=noninteractive apt-get update && \
   apt-get install -y --no-install-recommends \
     tox \
     graphviz \
     postgresql-autodoc \
     libffi-dev \
     inkscape \
     dia \
     plantuml \
     myrepos \
+    crudini \
     make && \
   rm -rf /var/lib/apt/lists/*
 
 USER jenkins