diff --git a/go.mod b/go.mod
index 6717d70..04d449a 100644
--- a/go.mod
+++ b/go.mod
@@ -2,7 +2,4 @@ module github.com/m-mizutani/goerr
 
 go 1.21
 
-require (
-	github.com/google/uuid v1.3.0
-	golang.org/x/exp v0.0.0-20230810033253-352e893a4cad
-)
+require github.com/google/uuid v1.3.0
diff --git a/go.sum b/go.sum
index 9e1e4ba..3dfe1c9 100644
--- a/go.sum
+++ b/go.sum
@@ -1,4 +1,2 @@
 github.com/google/uuid v1.3.0 h1:t6JiXgmwXMjEs8VusXIJk2BXHsn+wx8BZdTaoZ5fu7I=
 github.com/google/uuid v1.3.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
-golang.org/x/exp v0.0.0-20230810033253-352e893a4cad h1:g0bG7Z4uG+OgH2QDODnjp6ggkk1bJDsINcuWmJN1iJU=
-golang.org/x/exp v0.0.0-20230810033253-352e893a4cad/go.mod h1:FXUEEKJgO7OQYeo8N01OfiKP8RXMtf6e8aTskBGqWdc=