diff --git a/Cargo.lock b/Cargo.lock
index c4b354eb..7970ebf8 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -590,9 +590,9 @@ dependencies = [
 
 [[package]]
 name = "serde_json"
-version = "1.0.115"
+version = "1.0.117"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "12dc5c46daa8e9fdf4f5e71b6cf9a53f2487da0e86e55808e2d35539666497dd"
+checksum = "455182ea6142b14f93f4bc5320a2b31c1f266b66a4a5c858b013302a5d8cbfc3"
 dependencies = [
  "itoa",
  "ryu",
diff --git a/Cargo.toml b/Cargo.toml
index 8ff53c29..1481acd1 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -23,7 +23,7 @@ streaming-iterator = "0.1.5"
 bitflags = "2.5.0"
 humantime = {version = "2.1.0", optional = true}
 serde = {version = "1.0.203", features = ["derive"], optional = true}
-serde_json = {version = "1.0.114", optional = true}
+serde_json = {version = "1.0.117", optional = true}
 bincode = {version = "1.3.1", optional = true}
 tskit-derive = {version = "0.2.0", path = "tskit-derive", optional = true}
 delegate = "0.12.0"
@@ -33,7 +33,7 @@ anyhow = {version = "1.0.79"}
 clap = {version = "4.4.6", features = ["derive"]}
 serde = {version = "1.0.203", features = ["derive"]}
 serde-pickle = "1.1.0"
-serde_json = {version = "1.0.114"}
+serde_json = {version = "1.0.117"}
 bincode = "1.3.1"
 rand = "0.8.3"
 rand_distr = "0.4.0"