diff --git a/.gitignore b/.gitignore
index 3ed546c..a99e6fb 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,3 +4,4 @@
 github-closer
 nohup.out
 !.gitkeep
+/vendor
diff --git a/Makefile b/Makefile
index 7011ba1..c60ab79 100644
--- a/Makefile
+++ b/Makefile
@@ -1,8 +1,6 @@
 setup:
-	go get -u github.com/google/go-github/github
-	go get -u github.com/jessevdk/go-flags
-	go get -u github.com/joho/godotenv
-	go get -u golang.org/x/oauth2
+	go get -u github.com/golang/dep/...
+	dep ensure
 
 build:
 	go build
diff --git a/issue_manager.go b/issue_manager.go
index 5886cd0..08fbe57 100644
--- a/issue_manager.go
+++ b/issue_manager.go
@@ -1,6 +1,7 @@
 package main
 
 import (
+	"context"
 	"errors"
 	"fmt"
 	"github.com/google/go-github/github"
@@ -38,7 +39,7 @@ func NewIssueManager(organization string, repository string, team string, token
 
 func (im *IssueManager) FindIssues(spec string) ([]*github.Issue, error) {
 	queryString := im.buildQuery(spec)
-	searchResult, _, err := im.Client.Search.Issues(queryString, &github.SearchOptions{})
+	searchResult, _, err := im.Client.Search.Issues(context.Background(), queryString, &github.SearchOptions{})
 	if err != nil {
 		return nil, err
 	}
@@ -74,7 +75,7 @@ func (im *IssueManager) Close(issue *github.Issue) (*github.Issue, error) {
 	issueRequest := &github.IssueRequest{}
 	issueRequest.State = String("closed")
 
-	i, _, err := im.Client.Issues.Edit(im.Organization, im.Repository, *issue.Number, issueRequest)
+	i, _, err := im.Client.Issues.Edit(context.Background(), im.Organization, im.Repository, *issue.Number, issueRequest)
 
 	return i, err
 }
@@ -90,20 +91,20 @@ func (im *IssueManager) isUpdatedWithinDuration(issue *github.Issue) bool {
 
 func (im *IssueManager) Comment(issue *github.Issue, comment string) bool {
 	ic := &github.IssueComment{Body: &comment}
-	_, _, err := im.Client.Issues.CreateComment(im.Organization, im.Repository, *issue.Number, ic)
+	_, _, err := im.Client.Issues.CreateComment(context.Background(), im.Organization, im.Repository, *issue.Number, ic)
 
 	return err != nil
 }
 
 func (im *IssueManager) findUsersByTeamName(name string) ([]*github.User, error) {
-	teams, _, err := im.Client.Repositories.ListTeams(im.Organization, im.Repository, nil)
+	teams, _, err := im.Client.Repositories.ListTeams(context.Background(), im.Organization, im.Repository, nil)
 	if err != nil {
 		return nil, err
 	}
 
 	for _, t := range teams {
 		if *t.Name == name {
-			users, _, err := im.Client.Organizations.ListTeamMembers(*t.ID, &github.OrganizationListTeamMembersOptions{})
+			users, _, err := im.Client.Organizations.ListTeamMembers(context.Background(), *t.ID, &github.OrganizationListTeamMembersOptions{})
 			return users, err
 		}
 	}
diff --git a/lock.json b/lock.json
new file mode 100644
index 0000000..343f68b
--- /dev/null
+++ b/lock.json
@@ -0,0 +1,76 @@
+{
+    "memo": "9a281f8bd9bc5bca5f1ad41c0db67aa22119add0d9ff15a6f550a9b38c4450e0",
+    "projects": [
+        {
+            "name": "github.com/golang/protobuf",
+            "branch": "master",
+            "revision": "c9c7427a2a70d2eb3bafa0ab2dc163e45f143317",
+            "packages": [
+                "proto"
+            ]
+        },
+        {
+            "name": "github.com/google/go-github",
+            "branch": "master",
+            "revision": "69fd0adc8ab606780549a072f2e3b3f795d75832",
+            "packages": [
+                "github"
+            ]
+        },
+        {
+            "name": "github.com/google/go-querystring",
+            "branch": "master",
+            "revision": "53e6ce116135b80d037921a7fdd5138cf32d7a8a",
+            "packages": [
+                "query"
+            ]
+        },
+        {
+            "name": "github.com/jessevdk/go-flags",
+            "version": "v1.2.0",
+            "revision": "48cf8722c3375517aba351d1f7577c40663a4407",
+            "packages": [
+                "."
+            ]
+        },
+        {
+            "name": "github.com/joho/godotenv",
+            "version": "v1.1",
+            "revision": "726cc8b906e3d31c70a9671c90a13716a8d3f50d",
+            "packages": [
+                "."
+            ]
+        },
+        {
+            "name": "golang.org/x/net",
+            "branch": "master",
+            "revision": "a6577fac2d73be281a500b310739095313165611",
+            "packages": [
+                "context"
+            ]
+        },
+        {
+            "name": "golang.org/x/oauth2",
+            "branch": "master",
+            "revision": "1611bb46e67abc64a71ecc5c3ae67f1cbbc2b921",
+            "packages": [
+                ".",
+                "internal"
+            ]
+        },
+        {
+            "name": "google.golang.org/appengine",
+            "version": "v1.0.0",
+            "revision": "150dc57a1b433e64154302bdc40b6bb8aefa313a",
+            "packages": [
+                "internal",
+                "internal/base",
+                "internal/datastore",
+                "internal/log",
+                "internal/remote_api",
+                "internal/urlfetch",
+                "urlfetch"
+            ]
+        }
+    ]
+}
diff --git a/manifest.json b/manifest.json
new file mode 100644
index 0000000..0967ef4
--- /dev/null
+++ b/manifest.json
@@ -0,0 +1 @@
+{}