diff --git a/cypress/Dockerfile b/cypress/Dockerfile
index 8454eab..154cb91 100644
--- a/cypress/Dockerfile
+++ b/cypress/Dockerfile
@@ -1,19 +1,20 @@
 # syntax=docker/dockerfile:experimental
 ARG REGISTRY=swh-jenkins
 FROM $REGISTRY/tox
 LABEL maintainer="SoftwareHeritage"
 USER root
 
 RUN --mount=type=cache,id=apt-cache,target=/var/cache/apt --mount=type=cache,id=apt-lists,target=/var/lib/apt \
   export DEBIAN_FRONTEND=noninteractive && \
+  apt-get update && \
   apt-get install -y \
     libgtk2.0-0 \
     libnotify-dev \
     libgconf-2-4 \
     libnss3 \
     libxss1 \
     libasound2 \
     xvfb \
-  wait-for-it
+    wait-for-it
 
 USER jenkins
diff --git a/sphinx/Dockerfile b/sphinx/Dockerfile
index c15054f..e100544 100644
--- a/sphinx/Dockerfile
+++ b/sphinx/Dockerfile
@@ -1,27 +1,28 @@
 # syntax=docker/dockerfile:experimental
 ARG REGISTRY=swh-jenkins
 FROM $REGISTRY/base-buster
 
 USER root
 
 RUN --mount=type=cache,id=apt-cache,target=/var/cache/apt --mount=type=cache,id=apt-lists,target=/var/lib/apt \
   export DEBIAN_FRONTEND=noninteractive && \
+  apt-get update && \
   apt-get install -y --no-install-recommends \
     crudini \
     dia \
     graphviz \
     inkscape \
     libffi-dev \
     maven \
     make \
     myrepos \
     plantuml \
     postgresql-autodoc \
     rsync \
     tox
 
 USER jenkins
 
 RUN --mount=type=cache,id=pip-cache,target=/home/jenkins/.cache/pip,uid=1000,gid=1000 \
   python3 -m pip install --user --upgrade \
     pre-commit