diff --git a/data/pc/common/protocolVersions.json b/data/pc/common/protocolVersions.json
index 5abcfab8a..9268972bc 100644
--- a/data/pc/common/protocolVersions.json
+++ b/data/pc/common/protocolVersions.json
@@ -1,4 +1,12 @@
 [
+  {
+    "minecraftVersion": "25w09a",
+    "version": 1073742060,
+    "dataVersion": 4317,
+    "usesNetty": true,
+    "majorVersion": "1.21",
+    "releaseType": "snapshot"
+  },
   {
     "minecraftVersion": "25w08a",
     "version": 1073742059,