diff --git a/README.md b/README.md
index f57e0f1..da88a96 100644
--- a/README.md
+++ b/README.md
@@ -9,7 +9,7 @@ The Monkey is written in Go in the book, but in this repository it is written in
 
 ## Using Zig Version
 
-Zig: v0.9.1
+Zig: v0.13.0
 
 ## Supports
 
@@ -71,6 +71,12 @@ let fibonacci = fn(x) {
 fibonacci(15); #=> 610
 ```
 
+### Run tests
+
+```sh
+$ zig build test --summary all
+```
+
 ## Contributors
 
 - [ktanaka101](https://github.com/ktanaka101) - creator, maintainer