diff --git a/Cargo.lock b/Cargo.lock
index c89321f..a2d27be 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1111,7 +1111,7 @@ checksum = "7245cd7449cc792608c3c8a9eaf69bd4eabbabf802713748fd739c98b82f0747"
 dependencies = [
  "bytes 1.0.1",
  "fnv",
- "itoa",
+ "itoa 0.4.6",
 ]
 
 [[package]]
@@ -1176,7 +1176,7 @@ dependencies = [
  "http-body 0.3.1",
  "httparse",
  "httpdate 0.3.2",
- "itoa",
+ "itoa 0.4.6",
  "pin-project 1.0.2",
  "socket2",
  "tokio 0.2.25",
@@ -1200,7 +1200,7 @@ dependencies = [
  "http-body 0.4.0",
  "httparse",
  "httpdate 0.3.2",
- "itoa",
+ "itoa 0.4.6",
  "pin-project 1.0.2",
  "socket2",
  "tokio 1.7.1",
@@ -1301,6 +1301,12 @@ version = "0.4.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dc6f3ad7b9d11a0c00842ff8de1b60ee58661048eb8049ed33c73594f359d7e6"
 
+[[package]]
+name = "itoa"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4217ad341ebadf8d8e724e264f13e593e0648f5b3e94b3896a5df283be015ecc"
+
 [[package]]
 name = "js-sys"
 version = "0.3.47"
@@ -2543,12 +2549,12 @@ dependencies = [
 
 [[package]]
 name = "serde_json"
-version = "1.0.64"
+version = "1.0.89"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "799e97dc9fdae36a5c8b8f2cae9ce2ee9fdce2058c57a93e6099d919fd982f79"
+checksum = "020ff22c755c2ed3f8cf162dbb41a7268d934702f3ed3631656ea597e08fc3db"
 dependencies = [
  "indexmap",
- "itoa",
+ "itoa 1.0.4",
  "ryu",
  "serde",
 ]
@@ -2560,7 +2566,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "edfa57a7f8d9c1d260a549e7224100f6c43d43f9103e06dd8b4095a9b2b43ce9"
 dependencies = [
  "form_urlencoded",
- "itoa",
+ "itoa 0.4.6",
  "ryu",
  "serde",
 ]
diff --git a/block-types/Cargo.toml b/block-types/Cargo.toml
index 12750b1..353ecb1 100644
--- a/block-types/Cargo.toml
+++ b/block-types/Cargo.toml
@@ -7,5 +7,5 @@ edition = "2018"
 [dependencies]
 block-tools = { path = "../block-tools" }
 serde = "1.0.126"
-serde_json = "1.0.64"
+serde_json = "1.0.89"
 log = "0.4.14"