diff --git a/README.md b/README.md
index 34490bd..72cb20f 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@ Determines the monospace display width of a string in Ruby. Implementation based
 
 Unicode version: **12.1.0** (May 2019)
 
-Supported Rubies: **2.6**, **2.5**, **2.4**
+Supported Rubies: **2.7**, **2.6**, **2.5**, **2.4**
 
 Old Rubies that might still work: **2.3**, **2.2**, **2.1**, **2.0**, **1.9**