Update README.md

egison · Nov 16, 2019 · 786385e · 786385e
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diff --git a/README.md b/README.md
@@ -7,6 +7,12 @@ Homebrew formula to install Egison
 $ brew tap egison/egison
 $ brew install egison
 ```
+### Upgrade
+
+```sh
+$ brew tap egison/egison
+$ brew upgrade egison
+```
 
 ### Uninstallation