diff --git a/Cargo.lock b/Cargo.lock
index ea7fba86..590129f9 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -555,9 +555,9 @@ dependencies = [
 
 [[package]]
 name = "serde_json"
-version = "1.0.108"
+version = "1.0.109"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3d1c7e3eac408d115102c4c24ad393e0821bb3a5df4d506a80f85f7a742a526b"
+checksum = "cb0652c533506ad7a2e353cce269330d6afd8bdfb6d75e0ace5b35aacbd7b9e9"
 dependencies = [
  "itoa",
  "ryu",
diff --git a/Cargo.toml b/Cargo.toml
index b6db5d3c..57371e50 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -23,7 +23,7 @@ streaming-iterator = "0.1.5"
 bitflags = "1.2.1"
 humantime = {version = "2.1.0", optional = true}
 serde = {version = "1.0.193", features = ["derive"], optional = true}
-serde_json = {version = "1.0.108", optional = true}
+serde_json = {version = "1.0.109", optional = true}
 bincode = {version = "1.3.1", optional = true}
 tskit-derive = {version = "0.2.0", path = "tskit-derive", optional = true}
 delegate = "0.10.0"
@@ -33,7 +33,7 @@ anyhow = {version = "1.0.66"}
 clap = {version = "4.4.6", features = ["derive"]}
 serde = {version = "1.0.193", features = ["derive"]}
 serde-pickle = "1.1.0"
-serde_json = {version = "1.0.108"}
+serde_json = {version = "1.0.109"}
 bincode = "1.3.1"
 rand = "0.8.3"
 rand_distr = "0.4.0"