diff --git a/cmd/vendor/github.com/jonboulle/clockwork/clockwork.go b/cmd/vendor/github.com/jonboulle/clockwork/clockwork.go
index 4b6918b52..9ec96ed29 100644
--- a/cmd/vendor/github.com/jonboulle/clockwork/clockwork.go
+++ b/cmd/vendor/github.com/jonboulle/clockwork/clockwork.go
@@ -32,10 +32,17 @@ func NewRealClock() Clock {
 }
 
 // NewFakeClock returns a FakeClock implementation which can be
-// manually advanced through time for testing.
+// manually advanced through time for testing. The initial time of the
+// FakeClock will be an arbitrary non-zero time.
 func NewFakeClock() FakeClock {
+	// use a fixture that does not fulfill Time.IsZero()
+	return NewFakeClockAt(time.Date(1984, time.April, 4, 0, 0, 0, 0, time.UTC))
+}
+
+// NewFakeClockAt returns a FakeClock initialised at the given time.Time.
+func NewFakeClockAt(t time.Time) FakeClock {
 	return &fakeClock{
-		l: sync.RWMutex{},
+		time: t,
 	}
 }
 
@@ -117,9 +124,10 @@ func (fc *fakeClock) Sleep(d time.Duration) {
 
 // Time returns the current time of the fakeClock
 func (fc *fakeClock) Now() time.Time {
-	fc.l.Lock()
-	defer fc.l.Unlock()
-	return fc.time
+	fc.l.RLock()
+	t := fc.time
+	fc.l.RUnlock()
+	return t
 }
 
 // Advance advances fakeClock to a new point in time, ensuring channels from any
diff --git a/glide.lock b/glide.lock
index 693b7cb11..30edcba38 100644
--- a/glide.lock
+++ b/glide.lock
@@ -1,5 +1,5 @@
-hash: c04a6b4fa79b3e780e38f875e3863551c8a7e5a1d1020b9a3a06268d50e592e3
-updated: 2016-08-15T15:51:12.533454067-07:00
+hash: 772308b285e752f35b2e87f75271501d23bbd9e72840dd1980fc6cf38a406b69
+updated: 2016-08-16T16:30:32.22550013-07:00
 imports:
 - name: bitbucket.org/ww/goautoneg
   version: 75cd24fc2f2c2a2088577d12123ddee5f54e0675
@@ -64,7 +64,7 @@ imports:
 - name: github.com/inconshreveable/mousetrap
   version: 76626ae9c91c4f2a10f34cad8ce83ea42c93bb75
 - name: github.com/jonboulle/clockwork
-  version: 72f9bd7c4e0c2a40055ab3d0f09654f730cce982
+  version: 2eee05ed794112d45db504eb05aa693efd2b8b09
 - name: github.com/kballard/go-shellquote
   version: d8ec1a69a250a17bb0e419c386eac1f3711dc142
 - name: github.com/kr/pty
diff --git a/glide.yaml b/glide.yaml
index de0b409c4..fcf84eadf 100644
--- a/glide.yaml
+++ b/glide.yaml
@@ -62,7 +62,7 @@ import:
 - package: github.com/inconshreveable/mousetrap
   version: 76626ae9c91c4f2a10f34cad8ce83ea42c93bb75
 - package: github.com/jonboulle/clockwork
-  version: 72f9bd7c4e0c2a40055ab3d0f09654f730cce982
+  version: v0.1.0
 - package: github.com/kballard/go-shellquote
   version: d8ec1a69a250a17bb0e419c386eac1f3711dc142
 - package: github.com/kr/pty