diff --git a/web/src/main/resources/public/mc_versions.json b/web/src/main/resources/public/mc_versions.json
index c9e5969..119115a 100644
--- a/web/src/main/resources/public/mc_versions.json
+++ b/web/src/main/resources/public/mc_versions.json
@@ -1,4 +1,20 @@
 [
+  {
+    "id": "1.21-rc1",
+    "name": "1.21 Release Candidate 1",
+    "world_version": 3952,
+    "series_id": "main",
+    "protocol_version": 1073742027,
+    "pack_version": {
+      "resource": 34,
+      "data": 48
+    },
+    "build_time": "2024-06-10T12:21:36+00:00",
+    "java_component": "java-runtime-delta",
+    "java_version": 21,
+    "stable": false,
+    "use_editor": false
+  },
   {
     "id": "1.21-pre4",
     "name": "1.21 Pre-Release 4",