diff --git a/Telegram/build/prepare/prepare.py b/Telegram/build/prepare/prepare.py
index 0d4aeecf1..78be41ef2 100644
--- a/Telegram/build/prepare/prepare.py
+++ b/Telegram/build/prepare/prepare.py
@@ -57,7 +57,7 @@ if not os.path.isdir(thirdPartyDir + '/' + keysLoc):
 
 pathPrefixes = [
     'ThirdParty\\Strawberry\\perl\\bin',
-    'ThirdParty\\Python27',
+    'ThirdParty\\Python39',
     'ThirdParty\\NASM',
     'ThirdParty\\jom',
     'ThirdParty\\cmake\\bin',
diff --git a/docs/building-win-x64.md b/docs/building-win-x64.md
index 37d1bfd80..734d0aded 100644
--- a/docs/building-win-x64.md
+++ b/docs/building-win-x64.md
@@ -23,7 +23,7 @@ You will require **api_id** and **api_hash** to access the Telegram API servers.
 * Download **Yasm** executable from [http://yasm.tortall.net/Download.html](http://yasm.tortall.net/Download.html), rename to *yasm.exe* and put to ***BuildPath*\\ThirdParty\\yasm**
 * Download **MSYS2** installer from [http://www.msys2.org/](http://www.msys2.org/) and install to ***BuildPath*\\ThirdParty\\msys64**
 * Download **jom** archive from [http://download.qt.io/official_releases/jom/jom.zip](http://download.qt.io/official_releases/jom/jom.zip) and unpack to ***BuildPath*\\ThirdParty\\jom**
-* Download **Python 3.9** installer from [https://www.python.org/downloads/](https://www.python.org/downloads/) and install to ***BuildPath*\\ThirdParty\\Python27**
+* Download **Python 3.9** installer from [https://www.python.org/downloads/](https://www.python.org/downloads/) and install to ***BuildPath*\\ThirdParty\\Python39**
 * Download **CMake** installer from [https://cmake.org/download/](https://cmake.org/download/) and install to ***BuildPath*\\ThirdParty\\cmake**
 * Download **Ninja** executable from [https://github.com/ninja-build/ninja/releases/download/v1.7.2/ninja-win.zip](https://github.com/ninja-build/ninja/releases/download/v1.7.2/ninja-win.zip) and unpack to ***BuildPath*\\ThirdParty\\Ninja**
 * Download **Git** installer from [https://git-scm.com/download/win](https://git-scm.com/download/win) and install it.