diff --git a/bin/install b/bin/install
index fecaa6cc..7fd8af78 100755
--- a/bin/install
+++ b/bin/install
@@ -86,7 +86,7 @@ EOF
   end
 
   def supported_ruby_versions
-    ['2.5', '2.4', '2.3', '2.2', '2.1', '2.0']
+    ['2.6', '2.5', '2.4', '2.3', '2.2', '2.1', '2.0']
   end
 
   # check ruby version, only version 2.x works