diff --git a/tests/requirements.txt b/tests/requirements.txt
index 77a77f7f0..aec3ccba7 100644
--- a/tests/requirements.txt
+++ b/tests/requirements.txt
@@ -1,3 +1,4 @@
+attrs==19.3.0
 beautifulsoup4==4.8.0
 certifi==2019.3.9
 chardet==3.0.4