diff --git a/workshop_serveless/ex4/Cargo.lock b/workshop_serveless/ex4/Cargo.lock
index 69d41d7..a939946 100644
--- a/workshop_serveless/ex4/Cargo.lock
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-"checksum winapi-x86_64-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
-"checksum ws2_32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "d59cefebd0c892fa2dd6de581e937301d8552cb44489cdff035c6187cb63fa5e"
-"checksum xml-rs 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "3c1cb601d29fe2c2ac60a2b2e5e293994d87a1f6fa9687a31a15270f909be9c2"
+ "bitflags",
+]
diff --git a/workshop_serveless/ex4/Cargo.toml b/workshop_serveless/ex4/Cargo.toml
index a42557a..60447fa 100644
--- a/workshop_serveless/ex4/Cargo.toml
+++ b/workshop_serveless/ex4/Cargo.toml
@@ -17,7 +17,7 @@ futures = "0.1"
 futures-backoff = "0.1"
 rusoto_core = "0.38"
 uuid = { version = "0.7", features = ["v4"]}
-tokio = "0.1"
+tokio = "1.8"
 lambda_runtime = "0.2.0"
 lambda_runtime_errors = "0.1.0"
 lambda_http = "0.1.0"