diff --git a/bucket/mercurial.json b/bucket/mercurial.json
index bb4631ab68..45d70e0a36 100644
--- a/bucket/mercurial.json
+++ b/bucket/mercurial.json
@@ -1,16 +1,16 @@
 {
-    "version": "6.2.2",
+    "version": "6.3rc0",
     "description": "Fast, lightweight, distributed source control management system designed for easy and efficient handling of very large distributed projects.",
     "homepage": "https://www.mercurial-scm.org/",
     "license": "GPL-2.0-only",
     "architecture": {
         "64bit": {
-            "url": "https://www.mercurial-scm.org/release/windows/Mercurial-6.2.2-x64.exe",
-            "hash": "dcdf691ab082b7c4358dedc5a0de46f33ea90be84613175a487b1efebc4d1df6"
+            "url": "https://www.mercurial-scm.org/release/windows/Mercurial-6.3rc0-x64.exe",
+            "hash": "d6b186b4c01aa015ec417ff2e1368e6787055fd9738cc1e2bbf5a3fc123a66e6"
         },
         "32bit": {
-            "url": "https://www.mercurial-scm.org/release/windows/Mercurial-6.2.2-x86.exe",
-            "hash": "0018960056a08aea833381fba79d68eb6fe0c64a5322cf66de1a1323f68d83e8"
+            "url": "https://www.mercurial-scm.org/release/windows/Mercurial-6.3rc0-x86.exe",
+            "hash": "456fe745c5de84e31ad404dabdefab9c3282c308c5f1c4ba10ae712153bdab5e"
         }
     },
     "innosetup": true,