diff --git a/go.mod b/go.mod
index 212ad93..9401614 100644
--- a/go.mod
+++ b/go.mod
@@ -1,8 +1,10 @@
 module github.com/gostaticanalysis/analysisutil
 
-go 1.12
+go 1.16
 
 require (
 	github.com/gostaticanalysis/comment v1.4.2
 	golang.org/x/tools v0.1.1-0.20210302220138-2ac05c832e1a
 )
+
+retract v0.6.3