diff --git a/vm/rust/Cargo.toml b/vm/rust/Cargo.toml
index 4a8588f68d..0b94c0db29 100644
--- a/vm/rust/Cargo.toml
+++ b/vm/rust/Cargo.toml
@@ -18,6 +18,7 @@ once_cell = "1.18.0"
 lazy_static = "1.4.0"
 semver = "1.0.22"
 anyhow = "1.0.81"
+num_cpus = "1.15"
 
 [lib]
 crate-type = ["staticlib"]