diff --git a/Cargo.lock b/Cargo.lock
index 8e0a49b..e243428 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2147,6 +2147,7 @@ dependencies = [
  "memchr",
  "mio",
  "num_cpus",
+ "parking_lot",
  "pin-project-lite",
  "socket2",
  "tokio-macros",