diff --git a/base/Dockerfile b/base/Dockerfile
index c825af6..31aa1e6 100644
--- a/base/Dockerfile
+++ b/base/Dockerfile
@@ -1,28 +1,29 @@
 FROM jenkins/jnlp-slave
 LABEL maintainer="SoftwareHeritage"
 USER root
 
 # some base packages
 RUN apt-get update && \
   apt-get upgrade -y && \
   apt-get install -y \
     build-essential \
     curl \
     python3-dev \
     python3-pip \
     python3-venv libsvn-dev \
     libsystemd-dev \
-    pkg-config
+    pkg-config \
+    jq
 
 # install postgresql 10
 RUN echo deb http://apt.postgresql.org/pub/repos/apt/ stretch-pgdg main > /etc/apt/sources.list.d/postgres.list
 RUN wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | apt-key add -
 RUN apt-get update && \
     apt-get install -y \
 	  postgresql-10 \
 	  postgresql-client-10 \
 	  postgresql-server-dev-10 \
 	  arcanist && \
 	rm -rf /var/lib/apt/lists/*
 
 USER jenkins