diff --git a/sphinx/Dockerfile b/sphinx/Dockerfile
index 31f9e58..fc98ac3 100644
--- a/sphinx/Dockerfile
+++ b/sphinx/Dockerfile
@@ -1,20 +1,20 @@
 ARG REGISTRY=swh-jenkins
 FROM $REGISTRY/base
 
 USER root
 RUN DEBIAN_FRONTEND=noninteractive apt-get update && \
   apt-get install -y --no-install-recommends \
-    tox \
+    crudini \
+    dia \
     graphviz \
-    postgresql-autodoc \
-    libffi-dev \
     inkscape \
-    dia \
-    plantuml \
+    libffi-dev \
+    make \
     myrepos \
-    crudini \
+    plantuml \
+    postgresql-autodoc \
     rsync \
-    make && \
-  rm -rf /var/lib/apt/lists/*
+    tox \
+  && rm -rf /var/lib/apt/lists/*
 
 USER jenkins