diff --git a/Cargo.lock b/Cargo.lock
index 154bebc..6cbaa1b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1417,7 +1417,7 @@ dependencies = [
  "serde",
  "serde_json",
  "sha2",
- "tokio 0.2.20",
+ "tokio 0.2.21",
  "xml-rs",
 ]
 
@@ -1486,7 +1486,7 @@ dependencies = [
  "serde",
  "serde_json",
  "shlex",
- "tokio 0.2.20",
+ "tokio 0.2.21",
  "zeroize",
 ]
 
@@ -1526,7 +1526,7 @@ dependencies = [
  "serde",
  "sha2",
  "time 0.2.14",
- "tokio 0.2.20",
+ "tokio 0.2.21",
 ]
 
 [[package]]
@@ -1678,9 +1678,9 @@ dependencies = [
 
 [[package]]
 name = "serde_json"
-version = "1.0.53"
+version = "1.0.66"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "993948e75b189211a9b31a7528f950c6adc21f9720b6438ff80a7fa2f864cea2"
+checksum = "336b10da19a12ad094b59d870ebde26a45402e5b470add4b5fd03c5048a32127"
 dependencies = [
  "itoa",
  "ryu",
diff --git a/Cargo.toml b/Cargo.toml
index 110ed48..a3016e9 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -9,7 +9,7 @@ edition = "2018"
 [dependencies]
 # lambda = { version = "0.2.1", package = "lambda_runtime" }
 lambda = { git = "https://github.com/awslabs/aws-lambda-rust-runtime/", branch = "master" }
-serde_json = "1.0.53"
+serde_json = "1.0.66"
 tokio = { version = "0.2", features = ["full"] }
 lambda_runtime_client = "0.2.2"
 serde_derive = "1.0.106"