diff --git a/go.mod b/go.mod
index c3c1e6a..add641d 100644
--- a/go.mod
+++ b/go.mod
@@ -1,5 +1,8 @@
 module github.com/tus/tusd
 
+// Specify the Go version needed for the Heroku deployment
+// See https://github.com/heroku/heroku-buildpack-go#go-module-specifics
+// +heroku goVersion go1.16
 go 1.16
 
 require (