added update section
@@ -53,3 +53,48 @@ _This installation method only works on Windows 10, 8.1, or 7 (SP1, with [PowerS
```
To update, simply re-run the installation command above.
+
+# Upgrade the Flow CLI
+
+## macOS
+
+### Homebrew
+
+```sh
+brew upgrade flow-cli
+```
+
+### From a pre-built binary
+
+_This update method only works on x86-64._
+
+This script downloads and updates the appropriate binary for your system:
+
+```sh
+sh -ci "$(curl -fsSL https://storage.googleapis.com/flow-cli/install.sh)"
+```
+
+## Linux
+
+### From a pre-built binary
+
+_This update method only works on x86-64._
+
+This script downloads and updates the appropriate binary for your system:
+
+```sh
+sh -ci "$(curl -fsSL https://storage.googleapis.com/flow-cli/install.sh)"
+```
+
+## Windows
+
+### From a pre-built binary
+
+_This update method only works on Windows 10, 8.1, or 7 (SP1, with [PowerShell 3.0](https://www.microsoft.com/en-ca/download/details.aspx?id=34595)), on x86-64._
+
+1. Open PowerShell ([Instructions](https://docs.microsoft.com/en-us/powershell/scripting/install/installing-windows-powershell?view=powershell-7#finding-powershell-in-windows-10-81-80-and-7))
+2. In PowerShell, run:
+
+ ```powershell
+ iex "& { $(irm 'https://storage.googleapis.com/flow-cli/install.ps1') }"
+ ```
