diff --git a/README.md b/README.md
index c7c033e..fe7fbfb 100644
--- a/README.md
+++ b/README.md
@@ -26,6 +26,18 @@ is allowed to privileged users only (such as *root*).
 Use `sudo` to install as root if *sms-handler* is to be configured
 with a reserved port.
 
+### Upgrade
+
+```sh
+pip upgrade sms-handler
+```
+
+or:
+
+```sh
+pipx upgrade sms-handler
+```
+
 ## Configuration
 
 Configuration is done by environment variables, prefixed by `SMS_HANDLER_`: