diff --git a/base-notebook/Dockerfile b/base-notebook/Dockerfile
index ceebcbc8..4a521af8 100644
--- a/base-notebook/Dockerfile
+++ b/base-notebook/Dockerfile
@@ -1,9 +1,9 @@
 # Copyright (c) Jupyter Development Team.
 # Distributed under the terms of the Modified BSD License.
 
-# Ubuntu 20.04 (focal)
-# https://hub.docker.com/_/ubuntu/tags?page=1&name=focal
-ARG ROOT_CONTAINER=ubuntu:20.04
+# Ubuntu 22.04 (jammy)
+# https://hub.docker.com/_/ubuntu/tags?page=1&name=jammy
+ARG ROOT_CONTAINER=ubuntu:22.04
 
 FROM $ROOT_CONTAINER
 
@@ -85,7 +85,7 @@ RUN echo "auth requisite pam_deny.so" >> /etc/pam.d/su && \
 USER ${NB_UID}
 
 # Pin python version here, or set it to "default"
-ARG PYTHON_VERSION=3.10
+ARG PYTHON_VERSION=3.7
 
 # Setup work directory for backward-compatibility
 RUN mkdir "/home/${NB_USER}/work" && \
diff --git a/tests/base-notebook/test_python.py b/tests/base-notebook/test_python.py
index 8a41bebc..afcaacc9 100644
--- a/tests/base-notebook/test_python.py
+++ b/tests/base-notebook/test_python.py
@@ -5,7 +5,7 @@ import logging
 from tests.conftest import TrackedContainer
 
 LOGGER = logging.getLogger(__name__)
-EXPECTED_PYTHON_VERSION = "3.10"
+EXPECTED_PYTHON_VERSION = "3.7"
 
 
 def test_python_version(container: TrackedContainer) -> None: