diff --git a/Cargo.lock b/Cargo.lock
index 6600f154f4296..6de9c5d0fd089 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -693,7 +693,6 @@ dependencies = [
  "foundry-utils",
  "futures",
  "hex",
- "num_cpus",
  "rayon",
  "rusoto_core",
  "rusoto_kms",
diff --git a/cast/Cargo.toml b/cast/Cargo.toml
index cee77a664ee80..4ea2ff583dbef 100644
--- a/cast/Cargo.toml
+++ b/cast/Cargo.toml
@@ -25,7 +25,6 @@ serde = "1"
 serde_json = "1"
 chrono = "0.4"
 hex = "0.4"
-num_cpus = "1"
 rayon = "1"
 
 # aws
diff --git a/cast/src/lib.rs b/cast/src/lib.rs
index 2ad2e8b605df4..5770e71e29824 100644
--- a/cast/src/lib.rs
+++ b/cast/src/lib.rs
@@ -1801,7 +1801,7 @@ impl SimpleCast {
             eyre::bail!("Invalid signature");
         };
 
-        let num_threads = num_cpus::get();
+        let num_threads = std::thread::available_parallelism().map_or(1, |n| n.get());
         let found = AtomicBool::new(false);
 
         let result: Option<(u32, String, String)> =