diff --git a/.CI/build-dep/Dockerfile b/.CI/build-dep/Dockerfile
index c0f8abe..5f329b7 100644
--- a/.CI/build-dep/Dockerfile
+++ b/.CI/build-dep/Dockerfile
@@ -1,4 +1,7 @@
-FROM docker.openmodelica.org/build-deps:v1.16.3
+# The image the OpenModelica repository builds against, see its .CI/common.groovy
+FROM docker.openmodelica.org/build-deps:ubuntu-22.04
 
-RUN apt-get update && apt-get install libxml2 libxslt1.1 libxml2-dev libxslt1-dev
+# -y because a base image that does not assume it turns the build into a prompt,
+# and python3-pip because the line below needs it and the base may not carry it.
+RUN apt-get update && apt-get install -y libxml2 libxslt1.1 libxml2-dev libxslt1-dev python3-pip
 RUN pip3 install matplotlib FMPy psycopg2-binary