diff --git a/commands/preprocess_cssless.py b/commands/preprocess_cssless.py

index 11170e3..0c29d96 100644

--- a/commands/preprocess_cssless.py

+++ b/commands/preprocess_cssless.py

@@ -25,8 +25,11 @@ import warnings

import cssutils

from lxml import etree

from lxml.etree import strip_elements

+import premailer

from premailer import Premailer

+premailer_version = premailer.__version__.split('.')

+premailer_is_new=len(premailer_version) >= 2 and int(premailer_version[0]) >= 3 and int(premailer_version[1]) >= 9

def preprocess_html_merge_cssless(src_path, dst_path):

with open(src_path, 'r', encoding='utf-8') as a_file:

@@ -72,8 +75,13 @@ def preprocess_html_merge_css(root, src_path):

with warnings.catch_warnings():

warnings.simplefilter("ignore")

- premailer = Premailer(root, base_url=src_path,

- disable_link_rewrites=True, remove_classes=True)

+ if premailer_is_new:

+ premailer = Premailer(root, base_url=src_path,

+ disable_link_rewrites=True, remove_classes=True,

+ allow_loading_external_files=True)

+ else:

+ premailer = Premailer(root, base_url=src_path,

+ disable_link_rewrites=True, remove_classes=True)

root = premailer.transform().getroot()

return output.getvalue()