diff --git a/requirements.txt b/requirements.txt
index 4dd59b2..f60881d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -9,6 +9,7 @@ certifi==2020.12.5
 chardet==3.0.4
 colorama==0.4.4
 future==0.18.2
+future-annotations==1.0.0
 html5lib==1.1
 idna==2.10
 Jinja2==2.11.2