diff --git a/_data/validator-libraries-modern.yml b/_data/validator-libraries-modern.yml
index 32b1f8dd..6bb799d7 100644
--- a/_data/validator-libraries-modern.yml
+++ b/_data/validator-libraries-modern.yml
@@ -224,7 +224,7 @@
     - name: jsonschema
       url: https://github.com/Julian/jsonschema
       notes:
-      date-draft:
+      date-draft: [2019-09, 2020-12]
       draft: [7, 6, 4, 3]
       license: "MIT"
     - name: fastjsonschema