diff --git a/go.mod b/go.mod
index 1548f36..4de8d58 100644
--- a/go.mod
+++ b/go.mod
@@ -3,3 +3,5 @@ module github.com/benbjohnson/immutable
 go 1.18
 
 require golang.org/x/exp v0.0.0-20220518171630-0b5c67f07fdf // indirect
+
+retract v0.4.2