diff --git a/go.mod b/go.mod
index 85ed8a8..776dfa8 100644
--- a/go.mod
+++ b/go.mod
@@ -1,5 +1,3 @@
 module github.com/tihtw/taiwan-invoice
 
 go 1.18
-
-require github.com/tihtw/taiwan-invoice v0.0.0-20201031001952-fd6f8710d0f7
diff --git a/go.sum b/go.sum
index a9bd94e..e69de29 100644
--- a/go.sum
+++ b/go.sum
@@ -1,2 +0,0 @@
-github.com/tihtw/taiwan-invoice v0.0.0-20201031001952-fd6f8710d0f7 h1:qWjmuedBc5PS3N7yCsjd/pRB9nj57LyXvByL0oD7sis=
-github.com/tihtw/taiwan-invoice v0.0.0-20201031001952-fd6f8710d0f7/go.mod h1:QNSJ4UJVuY421ZOeHB+ECbGdWzy9jwMNAfEr9eOcDFg=