diff --git a/CHANGELOG b/CHANGELOG
index 7f86c05..1c5c90f 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,4 +1,6 @@
 v 0.7
+  - Use GitLab API v4. #29
+  - Use dep to vendor dependencies. #31
   - dist: Windows binary is missing .exe suffix. #28
   - Fixed segfault when from project has no milestones. #27
   - Update go-gitlab library to v0.5.1. #21
diff --git a/cmd/gitlab-copy/config.go b/cmd/gitlab-copy/config.go
index 4a3fe9b..222e35e 100644
--- a/cmd/gitlab-copy/config.go
+++ b/cmd/gitlab-copy/config.go
@@ -14,7 +14,7 @@ import (
 )
 
 const (
-	apiPath = "/api/v3"
+	apiPath = "/api/v4"
 )
 
 type issueRange struct {
diff --git a/cmd/gitlab-copy/migration.go b/cmd/gitlab-copy/migration.go
index 42aef16..1ab2214 100644
--- a/cmd/gitlab-copy/migration.go
+++ b/cmd/gitlab-copy/migration.go
@@ -127,7 +127,7 @@ func (m *migration) migrateIssue(issueID int) error {
 		if err == nil {
 			for _, u := range users {
 				if u.Username == issue.Assignee.Username {
-					iopts.AssigneeID = &u.ID
+					iopts.AssigneeIDs = []int{u.ID}
 					break
 				}
 			}
@@ -152,7 +152,7 @@ func (m *migration) migrateIssue(issueID int) error {
 				cmopts := &gitlab.CreateMilestoneOptions{
 					Title:       &issue.Milestone.Title,
 					Description: &issue.Milestone.Description,
-					DueDate:     &issue.Milestone.DueDate,
+					DueDate:     issue.Milestone.DueDate,
 				}
 				mi, _, err := target.Milestones.CreateMilestone(tarProjectID, cmopts)
 				if err == nil {
@@ -296,7 +296,7 @@ func (m *migration) migrate() error {
 	s := make([]issueId, 0)
 
 	// Copy all source labels on target
-	labels, _, err := source.Labels.ListLabels(srcProjectID)
+	labels, _, err := source.Labels.ListLabels(srcProjectID, nil)
 	if err != nil {
 		return fmt.Errorf("source: can't fetch labels: %s", err.Error())
 	}
@@ -327,7 +327,7 @@ func (m *migration) migrate() error {
 			cmopts := &gitlab.CreateMilestoneOptions{
 				Title:       &mi.Title,
 				Description: &mi.Description,
-				DueDate:     &mi.DueDate,
+				DueDate:     mi.DueDate,
 			}
 			tmi, _, err := target.Milestones.CreateMilestone(tarProjectID, cmopts)
 			if err != nil {
diff --git a/cmd/gitlab-copy/stats.go b/cmd/gitlab-copy/stats.go
index 07f6b47..924a3e1 100644
--- a/cmd/gitlab-copy/stats.go
+++ b/cmd/gitlab-copy/stats.go
@@ -67,7 +67,7 @@ func (p *projectStats) computeStats(client *gitlab.Client) error {
 				case "closed":
 					p.nbClosed++
 				}
-				if issue.Milestone!=nil && issue.Milestone.Title != "" {
+				if issue.Milestone != nil && issue.Milestone.Title != "" {
 					p.milestones[issue.Milestone.Title]++
 				}
 			}
@@ -82,7 +82,7 @@ func (p *projectStats) computeStats(client *gitlab.Client) error {
 		return err
 	}
 
-	labels, _, err := client.Labels.ListLabels(p.project.ID)
+	labels, _, err := client.Labels.ListLabels(p.project.ID, nil)
 	if err != nil {
 		return fmt.Errorf("source: can't fetch labels: %s", err.Error())
 	}