diff --git a/chapter-B.21-cookie/go.mod b/chapter-B.21-cookie/go.mod
new file mode 100644
index 0000000..c78632f
--- /dev/null
+++ b/chapter-B.21-cookie/go.mod
@@ -0,0 +1,5 @@
+module chapter-B.21-cookie
+
+go 1.14
+
+require github.com/novalagung/gubrak/v2 v2.0.0 // indirect
diff --git a/chapter-B.21-cookie/go.sum b/chapter-B.21-cookie/go.sum
new file mode 100644
index 0000000..017e12a
--- /dev/null
+++ b/chapter-B.21-cookie/go.sum
@@ -0,0 +1,10 @@
+github.com/DefinitelyMod/gocsv v0.0.0-20181205141819-acfa5f112b45/go.mod h1:+nlrAh0au59iC1KN5RA1h1NdiOQYlNOBrbtE1Plqht4=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/novalagung/gubrak v1.0.0 h1:+iDvzUcSHUoa3bwP/ig40K2h9X+5cX2w5qcBb3izAwo=
+github.com/novalagung/gubrak/v2 v2.0.0 h1:7wqp2XA2cLuTHyxVYw3AS+vRSfiwo8h3hmKxPFulOmA=
+github.com/novalagung/gubrak/v2 v2.0.0/go.mod h1:zilliNLzP2RSdZ67Sz7NdqI4bg3j5zUTFR34tuXopA0=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
diff --git a/chapter-B.21-cookie/main.go b/chapter-B.21-cookie/main.go
index 5295bd8..cbff8df 100644
--- a/chapter-B.21-cookie/main.go
+++ b/chapter-B.21-cookie/main.go
@@ -2,9 +2,10 @@ package main
 
 import (
 	"fmt"
-	"github.com/novalagung/gubrak"
 	"net/http"
 	"time"
+
+	"github.com/novalagung/gubrak/v2"
 )
 
 type M map[string]interface{}
diff --git a/chapter-B.22-configuration-file/go.mod b/chapter-B.22-configuration-file/go.mod
new file mode 100644
index 0000000..da3d999
--- /dev/null
+++ b/chapter-B.22-configuration-file/go.mod
@@ -0,0 +1,3 @@
+module chapter-B.22-configuration-file
+
+go 1.14
diff --git a/chapter-B.22-configuration-file/main.go b/chapter-B.22-configuration-file/main.go
index ffa199b..f52ef6c 100644
--- a/chapter-B.22-configuration-file/main.go
+++ b/chapter-B.22-configuration-file/main.go
@@ -6,7 +6,7 @@ import (
 	"net/http"
 	"time"
 
-	"dasarpemrogramangolang/chapter-B.22-configuration-file/conf"
+	"chapter-B.22-configuration-file/conf"
 )
 
 type CustomMux struct {
diff --git a/chapter-B.23-handle-cancelled-http-request/1-handle-cancelled-request.go.temp b/chapter-B.23-handle-cancelled-http-request/1-handle-cancelled-request.go
similarity index 100%
rename from chapter-B.23-handle-cancelled-http-request/1-handle-cancelled-request.go.temp
rename to chapter-B.23-handle-cancelled-http-request/1-handle-cancelled-request.go