diff --git a/Cargo.lock b/Cargo.lock
index 0bbc517..13a83e3 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -80,7 +80,7 @@ dependencies = [
  "serde",
  "serde_derive",
  "stderrlog",
- "tokio 0.2.25",
+ "tokio 1.25.0",
  "webpki-roots",
 ]
 
diff --git a/lambda-smtp-relay/Cargo.toml b/lambda-smtp-relay/Cargo.toml
index 9f5b6f7..b1b7cc9 100644
--- a/lambda-smtp-relay/Cargo.toml
+++ b/lambda-smtp-relay/Cargo.toml
@@ -26,5 +26,5 @@ rustls = "^0.16"
 serde = "^1.0"
 serde_derive = "^1.0"
 stderrlog = "^0.4"
-tokio = "^0.2"
+tokio = "^1.25"
 webpki-roots = "^0.19"