diff --git a/base-buster/Dockerfile b/base-buster/Dockerfile
--- a/base-buster/Dockerfile
+++ b/base-buster/Dockerfile
@@ -78,6 +78,9 @@
 
 RUN pip3 install tree-sitter
 
+# install Azurite, a clone of Azure Blob Storage used for swh-objstorage tests
+RUN npm install -g azurite
+
 ## vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv ##
 # inlined from https://raw.githubusercontent.com/jenkinsci/docker-agent/4.13.3-2/11/bullseye/Dockerfile
 #