diff --git a/lib/mathematical/version.rb b/lib/mathematical/version.rb
index 4f3c440..a14d370 100644
--- a/lib/mathematical/version.rb
+++ b/lib/mathematical/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 class Mathematical
-  VERSION = "1.6.19"
+  VERSION = "1.6.20"
 end