diff --git a/ecosystem/nodes/cpp/run-validator.mdx b/ecosystem/nodes/cpp/run-validator.mdx
index 0ec6c04bd..d3aa6cb21 100644
--- a/ecosystem/nodes/cpp/run-validator.mdx
+++ b/ecosystem/nodes/cpp/run-validator.mdx
@@ -42,7 +42,7 @@ This guide explains how to run a validator TON node with MyTonCtrl from scratch.
 
 - Ubuntu 22.04 LTS or 24.04 LTS
 - Python 3.10 or higher
-- Clang 16.0.0 or higher
+- Clang 21.0.0 or higher
 
 ```bash
 # Check Ubuntu version
@@ -71,22 +71,24 @@ clang --version
   ```bash
   # Check Clang version
   clang --version
-  # If version 16, skip the steps below.
+  # If version 21, skip the steps below.
 
-  # Required for Ubuntu 22.04. Update current Clang to clang-16
-  sudo apt update
-  sudo apt install -y lsb-release wget software-properties-common gnupg
-  sudo wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key|sudo apt-key add -
+  # Ubuntu 22.04
+  sudo apt install lsb-release wget software-properties-common gnupg
   wget https://apt.llvm.org/llvm.sh
   chmod +x llvm.sh
-  sudo ./llvm.sh 16 clang
+  sudo ./llvm.sh 21 clang
 
-  # Change default Clang
-  sudo update-alternatives --install /usr/bin/clang clang /usr/bin/clang-16 100
-  sudo update-alternatives --install /usr/bin/clang++ clang++ /usr/bin/clang++-16 100
+  # Ubuntu 24.04
+  wget -qO- https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
+  echo "deb http://apt.llvm.org/noble/ llvm-toolchain-noble-21 main" | sudo tee /etc/apt/sources.list.d/llvm.list
+  sudo apt -y update
+  sudo apt install -y clang-21
+
+  # optionally, change default clang
+  sudo update-alternatives --install /usr/bin/clang clang /usr/bin/clang-21 200
+  sudo update-alternatives --install /usr/bin/clang++ clang++ /usr/bin/clang++-21 200
 
-  # Required for Ubuntu 24.04. Install clang-16
-  sudo apt install -y clang-16
 
   ```
 </Accordion>