diff --git a/requirements.txt b/requirements.txt
index 03f3c8e7..37dfa549 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -93,7 +93,7 @@ pylti==0.7.0
 django-lti-provider==1.0.0
 
 pyparsing<2.3.1
-edtf<=3.0.0
+edtf==4.0.1
 
 pbr==7.0.0 # bandit
 pyyaml==6.0.1 # bandit