diff --git a/lib/mail/version.rb b/lib/mail/version.rb
index 71a8a2f7f..28e35aa8b 100644
--- a/lib/mail/version.rb
+++ b/lib/mail/version.rb
@@ -5,7 +5,7 @@ module VERSION
     MAJOR = 2
     MINOR = 7
     PATCH = 1
-    BUILD = 'edge'
+    BUILD = 'rc1'
 
     STRING = [MAJOR, MINOR, PATCH, BUILD].compact.join('.')