diff --git a/README.md b/README.md
index 7998c28..2ce0ce4 100644
--- a/README.md
+++ b/README.md
@@ -150,6 +150,7 @@ Report issues for this extension in the [ocds-extensions repository](https://git
 
 ### v1.1.4
 
+* Disallow `Tender.lotDetails` from being null (bug introduced in first release)
 * `Tender.lotDetails` no longer uses a `$ref` to a `LotDetails` definition
 * Remove Sphinx directives from readme
 * Update extension.json for Extension Explorer
diff --git a/release-schema.json b/release-schema.json
index eac79f5..e1fa5be 100644
--- a/release-schema.json
+++ b/release-schema.json
@@ -13,10 +13,7 @@
         "lotDetails": {
           "title": "Lot Details",
           "description": "If this tender is divided into lots, details can be provided here of any criteria that apply to bidding on these lots. This extended property is currently focused on fields required by the EU TED data standard",
-          "type": [
-            "object",
-            "null"
-          ],
+          "type": "object",
           "properties": {
             "maximumLotsBidPerSupplier": {
               "title": "Maximum lots per supplier",