diff --git a/vendor.conf b/vendor.conf
index b4199d62df..54e699e114 100644
--- a/vendor.conf
+++ b/vendor.conf
@@ -30,7 +30,7 @@ github.com/syndtr/gocapability                      42c35b4376354fd554efc7ad35e0
 
 github.com/RackSec/srslog                           a4725f04ec91af1a91b380da679d6e0c2f061e59
 github.com/imdario/mergo                            1afb36080aec31e0d1528973ebe6721b191b0369 # v0.3.8
-golang.org/x/sync                                   cd5d95a43a6e21273425c7ae415d3df9ea832eeb
+golang.org/x/sync                                   6e8e738ad208923de99951fe0b48239bfd864f28
 
 # buildkit
 github.com/moby/buildkit                            9065b18ba4633c75862befca8188de4338d9f94a # v0.8.2
diff --git a/vendor/golang.org/x/sync/semaphore/semaphore.go b/vendor/golang.org/x/sync/semaphore/semaphore.go
index 7f096fef07..30f632c577 100644
--- a/vendor/golang.org/x/sync/semaphore/semaphore.go
+++ b/vendor/golang.org/x/sync/semaphore/semaphore.go
@@ -67,7 +67,12 @@ func (s *Weighted) Acquire(ctx context.Context, n int64) error {
 			// fix up the queue, just pretend we didn't notice the cancelation.
 			err = nil
 		default:
+			isFront := s.waiters.Front() == elem
 			s.waiters.Remove(elem)
+			// If we're at the front and there're extra tokens left, notify other waiters.
+			if isFront && s.size > s.cur {
+				s.notifyWaiters()
+			}
 		}
 		s.mu.Unlock()
 		return err
@@ -97,6 +102,11 @@ func (s *Weighted) Release(n int64) {
 		s.mu.Unlock()
 		panic("semaphore: released more than held")
 	}
+	s.notifyWaiters()
+	s.mu.Unlock()
+}
+
+func (s *Weighted) notifyWaiters() {
 	for {
 		next := s.waiters.Front()
 		if next == nil {
@@ -123,5 +133,4 @@ func (s *Weighted) Release(n int64) {
 		s.waiters.Remove(next)
 		close(w.ready)
 	}
-	s.mu.Unlock()
 }