diff --git a/build.cmd b/build.cmd
index 700ac9014..d75ca2b41 100644
--- a/build.cmd
+++ b/build.cmd
@@ -15,7 +15,7 @@ if "%VisualStudioVersion%" == "" (
 )
 if "%VisualStudioVersion%" lss "17.0" (
     echo(
-    echo Hello there! We just upgraded AirSim to Unreal Engine 4.24 and Visual Studio 2022.
+    echo Hello there! We just upgraded AirSim to Unreal Engine 4.27 and Visual Studio 2022.
     echo Here are few easy steps for upgrade so everything is new and shiny:
     echo https://github.com/Microsoft/AirSim/blob/master/docs/unreal_upgrade.md
     goto :buildfailed_nomsg
diff --git a/docs/unreal_custenv.md b/docs/unreal_custenv.md
index 4fd7f5cc3..d5c07b9c3 100644
--- a/docs/unreal_custenv.md
+++ b/docs/unreal_custenv.md
@@ -8,7 +8,7 @@ There is no `Epic Games Launcher` for Linux which means that if you need to crea
 
 ## Step by Step Instructions
 
-1. Make sure AirSim is built and Unreal 4.25 is installed as described in [build instructions](build_windows.md).
+1. Make sure AirSim is built and Unreal 4.27 is installed as described in [build instructions](build_windows.md).
 1. In `Epic Games Launcher` click the Learn tab then scroll down and find `Landscape Mountains`. Click the `Create Project` and download this content (~2GB download).
 
     ![current version](images/landscape_mountains.png)
@@ -19,7 +19,7 @@ There is no `Epic Games Launcher` for Linux which means that if you need to crea
     
     !!!note
 
-        The Landscape Mountains project is supported up to Unreal Engine version 4.24. If you do not have 4.24 installed, you should see a dialog titled `Select Unreal Engine Version` with a dropdown to select from installed versions. Select 4.25 or greater to migrate the project to a supported engine version. If you have 4.24 installed, you can manually migrate the project by navigating to the corresponding .uproject file in Windows Explorer, right-clicking it, and selecting the `Switch Unreal Engine version...` option. 
+        The Landscape Mountains project is supported up to Unreal Engine version 4.24. If you do not have 4.24 installed, you should see a dialog titled `Select Unreal Engine Version` with a dropdown to select from installed versions. Select 4.27 or greater to migrate the project to a supported engine version. If you have 4.24 installed, you can manually migrate the project by navigating to the corresponding .uproject file in Windows Explorer, right-clicking it, and selecting the `Switch Unreal Engine version...` option. 
 
 1. From the `File menu` select `New C++ class`, leave default `None` on the type of class, click `Next`, leave default name `MyClass`, and click `Create Class`. We need to do this because Unreal requires at least one source file in project. It should trigger compile and open up Visual Studio solution `LandscapeMountains.sln`.
 
@@ -34,7 +34,7 @@ There is no `Epic Games Launcher` for Linux which means that if you need to crea
     ```json
     {
     	"FileVersion": 3,
-    	"EngineAssociation": "4.24",
+    	"EngineAssociation": "4.27",
     	"Category": "Samples",
     	"Description": "",
     	"Modules": [
diff --git a/docs/unreal_upgrade.md b/docs/unreal_upgrade.md
index 7fd44af5d..0ac54402f 100644
--- a/docs/unreal_upgrade.md
+++ b/docs/unreal_upgrade.md
@@ -1,28 +1,28 @@
-# Upgrading to Unreal Engine 4.24
+# Upgrading to Unreal Engine 4.27
 
-These instructions apply if you are already using AirSim on Unreal Engine 4.16. If you have never installed AirSim, please see [How to get it](https://github.com/microsoft/airsim#how-to-get-it).
+These instructions apply if you are already using AirSim on Unreal Engine 4.25. If you have never installed AirSim, please see [How to get it](https://github.com/microsoft/airsim#how-to-get-it).
 
 **Caution:** The below steps will delete any of your unsaved work in AirSim or Unreal folder.
 
 ## Do this first
 
 ### For Windows Users
-1. Install Visual Studio 2019 with VC++, Python and C#.
-2. Install UE 4.24 through Epic Games Launcher.
-3. Start `x64 Native Tools Command Prompt for VS 2019` and navigate to AirSim repo.
+1. Install Visual Studio 2022 with VC++, Python and C#.
+2. Install UE 4.27 through Epic Games Launcher.
+3. Start `x64 Native Tools Command Prompt for VS 2022` and navigate to AirSim repo.
 4. Run `clean_rebuild.bat` to remove all unchecked/extra stuff and rebuild everything.
 5. See also [Build AirSim on Windows](build_windows.md) for more information.
 
 ### For Linux Users
 1. From your AirSim repo folder, run 'clean_rebuild.sh`.
 2. Rename or delete your existing folder for Unreal Engine.
-3. Follow step 1 and 2 to [install Unreal Engine 4.24](build_linux.md).
+3. Follow step 1 and 2 to [install Unreal Engine 4.27](build_linux.md).
 4. See also [Build AirSim on Linux](build_linux.md) for more information.
 
 ## Upgrading Your Custom Unreal Project
-If you have your own Unreal project created in an older version of Unreal Engine then you need to upgrade your project to Unreal 4.24. To do this,
+If you have your own Unreal project created in an older version of Unreal Engine then you need to upgrade your project to Unreal 4.27. To do this,
 
-1. Open .uproject file and look for the line `"EngineAssociation"` and make sure it reads like `"EngineAssociation": "4.24"`.
+1. Open .uproject file and look for the line `"EngineAssociation"` and make sure it reads like `"EngineAssociation": "4.27"`.
 2. Delete `Plugins/AirSim` folder in your Unreal project's folder.
 3. Go to your AirSim repo folder and copy `Unreal\Plugins` folder to your Unreal project's folder.
 4. Copy *.bat (or *.sh for Linux) from `Unreal\Environments\Blocks` to your project's folder.
@@ -33,7 +33,7 @@ If you have your own Unreal project created in an older version of Unreal Engine
 ### I have an Unreal project that is older than 4.16. How do I upgrade it?
 
 #### Option 1: Just Recreate Project
-If your project doesn't have any code or assets other than environment you downloaded then you can also simply [recreate the project in Unreal 4.24 Editor](unreal_custenv.md) and then copy Plugins folder from `AirSim/Unreal/Plugins`.
+If your project doesn't have any code or assets other than environment you downloaded then you can also simply [recreate the project in Unreal 4.27 Editor](unreal_custenv.md) and then copy Plugins folder from `AirSim/Unreal/Plugins`.
 
 #### Option 2: Modify Few Files
 Unreal versions newer than Unreal 4.15 has breaking changes. So you need to modify your *.Build.cs and *.Target.cs which you can find in the `Source` folder of your Unreal project. So what are those changes? Below is the gist of it but you should really refer to [Unreal's official 4.16 transition post](https://forums.unrealengine.com/showthread.php?145757-C-4-16-Transition-Guide).