diff --git a/config/nodepool/scripts/prepare_node.sh b/config/nodepool/scripts/prepare_node.sh
index 9b5b8c8f..cc918669 100755
--- a/config/nodepool/scripts/prepare_node.sh
+++ b/config/nodepool/scripts/prepare_node.sh
@@ -36,7 +36,7 @@ APT_PACKAGES+=" gettext"
 PIP_PACKAGES="python-glanceclient"
 # Requirements for Sahara
 PIP_PACKAGES+=" mysql-python"
-PIP_PACKAGES+=" pip tox"
+PIP_PACKAGES+=" pip==8.1.1 tox"
 
 echo "mysql-server mysql-server/root_password select $MYSQL_PASS" | sudo debconf-set-selections
 echo "mysql-server mysql-server/root_password_again select $MYSQL_PASS" | sudo debconf-set-selections