diff --git a/crates/harness_pyo3/Cargo.toml b/crates/harness_pyo3/Cargo.toml
index 52c49116ad5..abc5a7576b7 100644
--- a/crates/harness_pyo3/Cargo.toml
+++ b/crates/harness_pyo3/Cargo.toml
@@ -19,7 +19,7 @@ pyo3 = { version = "0.28", features = ["extension-module", "auto-initialize"] }
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
 parking_lot = "0.12"
-ffi_utils = { path = "../../../phenotype-shared/crates/ffi_utils" }
+
 
 [profile.release]
 opt-level = 3
diff --git a/crates/harness_pyo3/src/lib.rs b/crates/harness_pyo3/src/lib.rs
index 7f1bb69ef7c..1fa7cc84e00 100644
--- a/crates/harness_pyo3/src/lib.rs
+++ b/crates/harness_pyo3/src/lib.rs
@@ -7,7 +7,7 @@
 use pyo3::prelude::*;
 use pyo3::types::PyModule;
 use std::collections::HashMap;
-use ffi_utils::FfiMutex;
+use parking_lot::Mutex as FfiMutex;
 use std::time::{Duration, Instant};
 
 static CACHE: FfiMutex<Option<PyCache>> = FfiMutex::new(None);