diff --git a/tests/pipfile/py2-with-server-and-kernel-req/requirements3.txt b/tests/pipfile/py2-with-server-and-kernel-req/requirements3.txt
index 87e197c3a..a35c300c1 100644
--- a/tests/pipfile/py2-with-server-and-kernel-req/requirements3.txt
+++ b/tests/pipfile/py2-with-server-and-kernel-req/requirements3.txt
@@ -1,3 +1,3 @@
-# install this in the environment in which the notebook server
-# is running nbgitpuller does not work with Python 2
-nbgitpuller==0.6.1
+# install this in the environment in which the notebook server is running
+# nbgitpuller does not work with Python 2
+nbgitpuller
diff --git a/tests/venv/postBuild/postBuild b/tests/venv/postBuild/postBuild
index 4f301be50..808562da7 100755
--- a/tests/venv/postBuild/postBuild
+++ b/tests/venv/postBuild/postBuild
@@ -1,4 +1,4 @@
 #!/bin/bash
-jupyter nbextension enable --py --sys-prefix ipyleaflet
+jupyter server extension disable --sys-prefix jupyter_collaboration
 npm install --global configurable-http-proxy
 npm cache clean --force
diff --git a/tests/venv/postBuild/requirements.txt b/tests/venv/postBuild/requirements.txt
index 5a2f50966..2249db5c1 100644
--- a/tests/venv/postBuild/requirements.txt
+++ b/tests/venv/postBuild/requirements.txt
@@ -1 +1 @@
-ipyleaflet
+jupyter-collaboration
diff --git a/tests/venv/postBuild/verify b/tests/venv/postBuild/verify
index d09c2693e..7281d3f80 100755
--- a/tests/venv/postBuild/verify
+++ b/tests/venv/postBuild/verify
@@ -1,4 +1,4 @@
 #!/bin/bash
 set -euo pipefail
-jupyter nbextension list | grep 'jupyter-leaflet' | grep enabled
+jupyter server extension list 2>&1 | grep 'jupyter_collaboration' | grep disabled
 which configurable-http-proxy