diff --git a/aztk/node_scripts/setup_host.sh b/aztk/node_scripts/setup_host.sh
index 1390b1ba..acc5c06d 100644
--- a/aztk/node_scripts/setup_host.sh
+++ b/aztk/node_scripts/setup_host.sh
@@ -62,7 +62,6 @@ pull_docker_container () {
         docker login $DOCKER_ENDPOINT --username $DOCKER_USERNAME --password $DOCKER_PASSWORD
     fi
 
-
     for i in {1..5}; do
         docker pull $docker_repo_name && break ||
         echo "ERROR: docker pull $docker_repo_name failed ... retrying after $($i**2) seconds" &&
@@ -106,20 +105,14 @@ run_docker_container () {
         ln -s $docker_log $AZ_BATCH_TASK_WORKING_DIR/logs/docker.log
     fi
     echo "Finished running docker container"
-
 }
 
 
-
-
-
 main () {
-
     time(
         install_prerequisites
     ) 2>&1
 
-
     # set hostname in /etc/hosts if dns cannot resolve
     if ! host $HOSTNAME ; then
         echo $(hostname -I | awk '{print $1}') $HOSTNAME >> /etc/hosts
@@ -149,7 +142,11 @@ main () {
     # set up aztk python environment
     export LC_ALL=C.UTF-8
     export LANG=C.UTF-8
-    # ensure these packages are  compatibile before upgrading
+    # pin pipenv dependencies (and transitive dependencies) since pipenv does not
+    python3 -m pip install setuptools=="42.0.2"
+    python3 -m pip install zipp=="1.1.0"
+    python3 -m pip install virtualenv=="20.0.0"
+    # ensure these packages (pip, pipenv) are compatibile before upgrading
     python3 -m pip install pip=="18.0" pipenv=="2018.7.1"
     mkdir -p $AZTK_WORKING_DIR/.aztk-env
     cp $AZTK_WORKING_DIR/aztk/node_scripts/Pipfile $AZTK_WORKING_DIR/.aztk-env
diff --git a/requirements.txt b/requirements.txt
index e974ee01..3c0a7cde 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,7 +11,7 @@ paramiko~=2.4.2
 # Development
 yapf==0.22.0
 pylint==2.1.1
-pytest==3.1.3
+pytest==5.3.5
 pytest-xdist==1.22.0
 twine==1.11.0
 docker==3.2.1