diff --git a/Running-Mastodon/Development-guide.md b/Running-Mastodon/Development-guide.md
index 6b29f218..d3f13c8e 100644
--- a/Running-Mastodon/Development-guide.md
+++ b/Running-Mastodon/Development-guide.md
@@ -120,7 +120,7 @@ These are self-contained instructions for setting up a development environment o
 
 	```
 	rbenv init
-	rbenv install 2.5.0
+	rbenv install 2.5.1
 	```
 
 - Install/configure bundler to use your local rbenv: