diff --git a/Cargo.lock b/Cargo.lock
index 50bb310c..2d67b8c7 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -557,9 +557,9 @@ dependencies = [
 
 [[package]]
 name = "serde"
-version = "1.0.185"
+version = "1.0.188"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "be9b6f69f1dfd54c3b568ffa45c310d6973a5e5148fd40cf515acaf38cf5bc31"
+checksum = "cf9e0fcba69a370eed61bcf2b728575f726b50b55cba78064753d708ddc7549e"
 dependencies = [
  "serde_derive",
 ]
@@ -579,9 +579,9 @@ dependencies = [
 
 [[package]]
 name = "serde_derive"
-version = "1.0.185"
+version = "1.0.188"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dc59dfdcbad1437773485e0367fea4b090a2e0a16d9ffc46af47764536a298ec"
+checksum = "4eca7ac642d82aa35b60049a6eccb4be6be75e599bd2e9adb5f875a737654af2"
 dependencies = [
  "proc-macro2",
  "quote",
diff --git a/Cargo.toml b/Cargo.toml
index 2d79e9a8..c0796e57 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -22,7 +22,7 @@ libc = "0.2.81"
 streaming-iterator = "0.1.5"
 bitflags = "1.2.1"
 humantime = {version = "2.1.0", optional = true}
-serde = {version = "1.0.118", features = ["derive"], optional = true}
+serde = {version = "1.0.188", features = ["derive"], optional = true}
 serde_json = {version = "1.0.67", optional = true}
 bincode = {version = "1.3.1", optional = true}
 tskit-derive = {version = "0.2.0", path = "tskit-derive", optional = true}
@@ -32,7 +32,7 @@ delegate = "0.10.0"
 [dev-dependencies]
 anyhow = {version = "1.0.66"}
 clap = {version = "~3.2.8", features = ["derive"]}
-serde = {version = "1.0.118", features = ["derive"]}
+serde = {version = "1.0.188", features = ["derive"]}
 serde-pickle = "1.1.0"
 serde_json = {version = "1.0.67"}
 bincode = "1.3.1"