diff --git a/Cargo.lock b/Cargo.lock
index 92169d96a..8d8ce6f60 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -435,9 +435,9 @@ dependencies = [
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.79"
+version = "1.0.94"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e835ff2298f5721608eb1a980ecaee1aef2c132bf95ecc026a11b7bf3c01c02e"
+checksum = "a31971752e70b8b2686d7e46ec17fb38dad4051d94024c88df49b667caea9c84"
 dependencies = [
  "unicode-ident",
 ]
@@ -547,9 +547,9 @@ checksum = "e86697c916019a8588c99b5fac3cead74ec0b4b819707a682fd4d23fa0ce1ba1"
 
 [[package]]
 name = "serde"
-version = "1.0.203"
+version = "1.0.219"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7253ab4de971e72fb7be983802300c30b5a7f0c2e56fab8abfc6a214307c0094"
+checksum = "5f0e2c6ed6606019b4e29e69dbaba95b11854410e5347d525002456dbbb786b6"
 dependencies = [
  "serde_derive",
 ]
@@ -569,9 +569,9 @@ dependencies = [
 
 [[package]]
 name = "serde_derive"
-version = "1.0.203"
+version = "1.0.219"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "500cbc0ebeb6f46627f50f3f5811ccf6bf00643be300b4c3eabc0ef55dc5b5ba"
+checksum = "5b0276cf7f2c73365f7157c8123c21cd9a50fbbd844757af28ca1f5925fc2a00"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -609,9 +609,9 @@ checksum = "5ee073c9e4cd00e28217186dbe12796d692868f432bf2e97ee73bed0c56dfa01"
 
 [[package]]
 name = "syn"
-version = "2.0.57"
+version = "2.0.100"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "11a6ae1e52eb25aab8f3fb9fca13be982a373b8f1157ca14b897a825ba4a2d35"
+checksum = "b09a44accad81e1ba1cd74a32461ba89dee89095ba17b32f5d03683b1b1fc2a0"
 dependencies = [
  "proc-macro2",
  "quote",
diff --git a/Cargo.toml b/Cargo.toml
index 5f62df0a5..26b856406 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -23,7 +23,7 @@ codegen-units=1
 thiserror = "1.0"
 libc = "0.2.155"
 streaming-iterator = "0.1.5"
-serde = {version = "1.0.203", features = ["derive"], optional = true}
+serde = {version = "1.0.219", features = ["derive"], optional = true}
 serde_json = {version = "1.0.120", optional = true}
 bincode = {version = "1.3.1", optional = true}
 tskit-derive = {version = "0.2.0", path = "tskit-derive", optional = true}
@@ -32,7 +32,7 @@ chrono = { version = "0.4.40", default-features = false, features = ["now", "std
 [dev-dependencies]
 anyhow = {version = "1.0.86"}
 clap = {version = "4.4.6", features = ["derive"]}
-serde = {version = "1.0.203", features = ["derive"]}
+serde = {version = "1.0.219", features = ["derive"]}
 serde-pickle = "1.1.0"
 serde_json = {version = "1.0.120"}
 bincode = "1.3.1"