diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -1,5 +1,9 @@
 # Welcome to Colosseum, a successor of [AirSim](https://github.com/microsoft/AirSim)
   
+## IMPORTANT ANNOUNCEMENT
+Moving forward, we are now using Unreal Engine 5 version 5.03 or greater! If you
+want to use UE4.27, you can use the branch `ue4.27`.
+  
 ## Build Status
 [![Ubuntu Build](https://github.com/CodexLabsLLC/Colosseum/actions/workflows/test_ubuntu.yml/badge.svg)](https://github.com/CodexLabsLLC/Colosseum/actions/workflows/test_ubuntu.yml)
 [![MacOS Build](https://github.com/CodexLabsLLC/Colosseum/actions/workflows/test_macos.yml/badge.svg)](https://github.com/CodexLabsLLC/Colosseum/actions/workflows/test_macos.yml)