diff --git a/requirements.txt b/requirements.txt
index 0511c3e..fe3c239 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,3 +8,4 @@ selenium-requests==1.3
 six==1.12.0
 tldextract==2.2.0
 urllib3==1.25.2
+attr