diff --git a/substrate/client/chain-spec/Cargo.toml b/substrate/client/chain-spec/Cargo.toml
index 8af9e1b4758c2..765e3e9f7c77d 100644
--- a/substrate/client/chain-spec/Cargo.toml
+++ b/substrate/client/chain-spec/Cargo.toml
@@ -17,7 +17,7 @@ targets = ["x86_64-unknown-linux-gnu"]
 
 [dependencies]
 codec = { package = "parity-scale-codec", version = "3.6.1", default-features = false, features = ["derive"] }
-memmap2 = "0.5.0"
+memmap2 = "0.9.3"
 serde = { version = "1.0.195", features = ["derive"] }
 serde_json = "1.0.111"
 sc-client-api = { path = "../api" }