diff --git a/Cargo.toml b/Cargo.toml
index 9f077238b..5fb7970c7 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -27,7 +27,7 @@ bincode = {version = "1.3.1", optional = true}
 tskit-derive = {version = "0.1.0", path = "tskit-derive", optional = true}
 
 [dev-dependencies]
-clap = "~2.33.3"
+clap = "~2.34.0"
 serde = {version = "1.0.118", features = ["derive"]}
 serde-pickle = "1.1.0"
 bincode = "1.3.1"