diff --git a/README.md b/README.md
index 76d35e4..5cac20e 100644
--- a/README.md
+++ b/README.md
@@ -21,7 +21,7 @@
 
 This library officially supports the following Ruby versions:
 
-* MRI >= `2.4`
+* MRI >= `2.5
 * jruby >= `9.2`
 
 ## License