diff --git a/README.md b/README.md
index 4060581..ef17141 100644
--- a/README.md
+++ b/README.md
@@ -27,7 +27,7 @@ On macOS you can also use homebrew to install:
 
     brew install certigo
 
-Note that certigo requires Go 1.8 or later to build.
+Note that certigo requires Go 1.9 or later to build.
 
 ### Develop