diff --git a/requirements.txt b/requirements.txt
index e9c24a4..c90d734 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@ chardet==3.0.4
 extruct==0.10.0
 html-text==0.5.2
 html5lib==1.1
-idna==2.10
+idna==3.7
 isodate==0.6.0
 lxml==4.5.2
 mf2py==1.1.2