diff --git a/EDDI/ChangeLog.md b/EDDI/ChangeLog.md
index 6d5c72a044..57f5034f3b 100644
--- a/EDDI/ChangeLog.md
+++ b/EDDI/ChangeLog.md
@@ -2,6 +2,10 @@
 
 Full details of the variables available for each noted event, and VoiceAttack integrations, are available in the individual [event pages](https://github.com/EDCD/EDDI/wiki/Events).
 
+### 4.0.1-rc1
+  * Core
+    * Promote 4.0.1-b5 to rc1
+
 ### 4.0.1-b5
   * Core
     * Improve speech service detection of older Windows versions. 
diff --git a/Installer.iss b/Installer.iss
index a57618fe1a..b412dcbf02 100644
--- a/Installer.iss
+++ b/Installer.iss
@@ -2,7 +2,7 @@
 ; SEE THE DOCUMENTATION FOR DETAILS ON CREATING INNO SETUP SCRIPT FILES!
 
 #define MyAppName "EDDI"
-#define MyAppVersion "4.0.1-b5"
+#define MyAppVersion "4.0.1-rc1"
 #define MyAppPublisher "Elite Dangerous Community Developers (EDCD)"
 #define MyAppURL "https://github.com/EDCD/EDDI/"
 #define MyAppExeName "EDDI.exe"
diff --git a/Utilities/Constants.cs b/Utilities/Constants.cs
index 6832060820..f2b4a26402 100644
--- a/Utilities/Constants.cs
+++ b/Utilities/Constants.cs
@@ -10,7 +10,7 @@ public class Constants
     {
         public const string EDDI_NAME = "EDDI";
         public const string EDDI_URL_PROTOCOL = "eddi";
-        public static Version EDDI_VERSION = new Version(4, 0, 1, Version.TestPhase.b, 5);
+        public static Version EDDI_VERSION = new Version(4, 0, 1, Version.TestPhase.rc, 1);
         public const string EDDI_SERVER_URL = "https://edcd.github.io/EDDP/";
         public static readonly string EDDI_SYSTEM_MUTEX_NAME = $"{EDDI_SERVER_URL}/{EDDI_NAME}/{Environment.GetEnvironmentVariable("UserName")}";