diff --git a/Cargo.lock b/Cargo.lock
index 5fcc93fc6c..776afbb202 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,5 +1,7 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
+version = 3
+
 [[package]]
 name = "addr2line"
 version = "0.15.2"
@@ -2718,9 +2720,9 @@ dependencies = [
 
 [[package]]
 name = "serde_with"
-version = "1.9.3"
+version = "1.9.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6a3b379ba4fd515d3fdccfe8584eb9fcc6f7dd1bbe14636a12c98a36fbbfc850"
+checksum = "1ad9fdbb69badc8916db738c25efd04f0a65297d26c2f8de4b62e57b8c12bc72"
 dependencies = [
  "rustversion",
  "serde",
diff --git a/rust/Cargo.toml b/rust/Cargo.toml
index 3b6b2ea90c..947cbf8bda 100644
--- a/rust/Cargo.toml
+++ b/rust/Cargo.toml
@@ -122,7 +122,7 @@ self_update = { version = "0.27.0", optional = true, features = [
 semver = { version = "1.0.3", optional = true }
 serde = { version = "1.0.126", features = ["derive", "rc"] }
 serde_json = { version = "1.0.64", features = ["preserve_order"] }
-serde_with = "1.9.2"
+serde_with = "1.9.4"
 serde_yaml = { version = "0.8.17", optional = true }
 stencila-schema = "1.8.1"
 structopt = { version = "0.3.21", optional = true }