diff --git a/README.md b/README.md
index 6997e81..23d7105 100644
--- a/README.md
+++ b/README.md
@@ -13,7 +13,7 @@ This source code is for a Mastodon or Twitter bot that monitors particulate matt
 
 A tweet might look like this:
 
-<img width="482" height="388" src="https://github.com/aschuma/air_tweets/raw/master/tweet-screnshot.png">
+<img width="482" height="388" src="https://github.com/aschuma/air_tweets/raw/main/tweet-screnshot.png">
 
 This repository provides a cron job written in python 3. After a tweet submission no further tweets
 are created for a configurable period.