diff --git a/Gopkg.lock b/Gopkg.lock
index 9ca61695..3c7f5874 100644
--- a/Gopkg.lock
+++ b/Gopkg.lock
@@ -416,6 +416,14 @@
   revision = "f21a4dfb5e38f5895301dc265a8def02365cc3d0"
   version = "v0.3.0"
 
+[[projects]]
+  branch = "master"
+  digest = "1:c9e7a4b4d47c0ed205d257648b0e5b0440880cb728506e318f8ac7cd36270bc4"
+  name = "golang.org/x/time"
+  packages = ["rate"]
+  pruneopts = "UT"
+  revision = "fbb02b2291d28baffd63558aa44b4b56f178d650"
+
 [[projects]]
   digest = "1:c2dee8dbcc504d1a7858f5dbaed7c8b256c512c5e9e81480158c30185bbd2792"
   name = "google.golang.org/genproto"
@@ -532,6 +540,7 @@
     "golang.org/x/crypto/ssh/terminal",
     "golang.org/x/net/context",
     "golang.org/x/net/proxy",
+    "golang.org/x/time/rate",
     "google.golang.org/genproto/googleapis/api/annotations",
     "google.golang.org/grpc",
     "google.golang.org/grpc/codes",
diff --git a/Gopkg.toml b/Gopkg.toml
index fea1cd36..f07ad1f6 100644
--- a/Gopkg.toml
+++ b/Gopkg.toml
@@ -98,6 +98,10 @@
   name = "golang.org/x/sys"
   revision = "ebe1bf3edb3325c393447059974de898d5133eb8"
 
+[[constraint]]
+  name = "golang.org/x/time"
+  revision = "fbb02b2291d28baffd63558aa44b4b56f178d650"
+
 [[constraint]]
   name = "google.golang.org/genproto"
   revision = "df60624c1e9b9d2973e889c7a1cff73155da81c4"