diff --git a/testing_requirements.txt b/testing_requirements.txt
index b17a11a..c44ed8b 100644
--- a/testing_requirements.txt
+++ b/testing_requirements.txt
@@ -1,3 +1,4 @@
 pytest>=2.9.1
 pyflakes>=1.2.2
 BeautifulSoup4>=4.4.1
+pendulum>=1.2.4