diff --git a/Chapter08/actor_demo/Cargo.lock b/Chapter08/actor_demo/Cargo.lock
index 2d63228..cbed716 100644
--- a/Chapter08/actor_demo/Cargo.lock
+++ b/Chapter08/actor_demo/Cargo.lock
@@ -1,1150 +1,1178 @@
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+# It is not intended for manual editing.
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diff --git a/Chapter08/actor_demo/Cargo.toml b/Chapter08/actor_demo/Cargo.toml
index dabc791..1a875d8 100644
--- a/Chapter08/actor_demo/Cargo.toml
+++ b/Chapter08/actor_demo/Cargo.toml
@@ -7,4 +7,4 @@ edition = "2018"
 [dependencies]
 actix = "0.7.9"
 futures = "0.1.25"
-tokio = "0.1.15"
+tokio = "1.18.5"