diff --git a/tests/coordinator/src/tests/batch.rs b/tests/coordinator/src/tests/batch.rs
index 0160afb3..e0257dc3 100644
--- a/tests/coordinator/src/tests/batch.rs
+++ b/tests/coordinator/src/tests/batch.rs
@@ -1,4 +1,5 @@
 use std::{
+  sync::Mutex,
   time::Duration,
   collections::{HashSet, HashMap},
 };
@@ -235,6 +236,7 @@ pub async fn batch<C: Ciphersuite>(
 
 #[tokio::test]
 async fn batch_test() {
+  let _one_at_a_time = ONE_AT_A_TIME.get_or_init(|| Mutex::new(())).lock();
   let (processors, test) = new_test();
 
   test
diff --git a/tests/coordinator/src/tests/key_gen.rs b/tests/coordinator/src/tests/key_gen.rs
index f650c14f..ce4993a6 100644
--- a/tests/coordinator/src/tests/key_gen.rs
+++ b/tests/coordinator/src/tests/key_gen.rs
@@ -1,4 +1,5 @@
 use std::{
+  sync::Mutex,
   time::{Duration, SystemTime},
   collections::HashMap,
 };
@@ -172,6 +173,7 @@ pub async fn key_gen<C: Ciphersuite>(
 
 #[tokio::test]
 async fn key_gen_test() {
+  let _one_at_a_time = ONE_AT_A_TIME.get_or_init(|| Mutex::new(())).lock();
   let (processors, test) = new_test();
 
   test
diff --git a/tests/coordinator/src/tests/mod.rs b/tests/coordinator/src/tests/mod.rs
index 0e07d835..3ef9a050 100644
--- a/tests/coordinator/src/tests/mod.rs
+++ b/tests/coordinator/src/tests/mod.rs
@@ -1,3 +1,5 @@
+use std::sync::OnceLock;
+
 use ciphersuite::Ristretto;
 
 use dockertest::DockerTest;
@@ -16,6 +18,8 @@ pub use sign::sign;
 pub(crate) const COORDINATORS: usize = 4;
 pub(crate) const THRESHOLD: usize = ((COORDINATORS * 2) / 3) + 1;
 
+pub(crate) static ONE_AT_A_TIME: OnceLock<Mutex<()>> = OnceLock::new();
+
 pub(crate) fn new_test() -> (Vec<(Handles, <Ristretto as Ciphersuite>::F)>, DockerTest) {
   let mut coordinators = vec![];
   let mut test = DockerTest::new();
diff --git a/tests/coordinator/src/tests/sign.rs b/tests/coordinator/src/tests/sign.rs
index 98cd02a3..816caf87 100644
--- a/tests/coordinator/src/tests/sign.rs
+++ b/tests/coordinator/src/tests/sign.rs
@@ -1,4 +1,5 @@
 use std::{
+  sync::Mutex,
   time::Duration,
   collections::{HashSet, HashMap},
 };
@@ -177,6 +178,7 @@ pub async fn sign<C: Ciphersuite>(
 
 #[tokio::test]
 async fn sign_test() {
+  let _one_at_a_time = ONE_AT_A_TIME.get_or_init(|| Mutex::new(())).lock();
   let (processors, test) = new_test();
 
   test