diff --git a/requirements.txt b/requirements.txt
index b41a60ffd..79f8af063 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,3 +8,4 @@ html5lib==0.9999999
 mistune==0.7.3
 CacheControl==0.11.7
 lockfile==0.12.2
+pathlib2==2.1.0