diff --git a/crates/lifecycle/Cargo.toml b/crates/lifecycle/Cargo.toml
index c903378b7..483b0e7d7 100644
--- a/crates/lifecycle/Cargo.toml
+++ b/crates/lifecycle/Cargo.toml
@@ -69,6 +69,7 @@ uuid = { workspace = true, features = ["v4", "serde", "fast-rng", "macro-diagnos
 [dev-dependencies]
 metrics-util = { workspace = true, features = ["debugging"] }
 proptest = "1"
+serial_test = { workspace = true }
 temp-env.workspace = true
 tokio = { workspace = true, features = ["macros", "fs", "rt-multi-thread"] }
 
diff --git a/crates/lifecycle/src/core.rs b/crates/lifecycle/src/core.rs
index b09179170..6180d0022 100644
--- a/crates/lifecycle/src/core.rs
+++ b/crates/lifecycle/src/core.rs
@@ -1114,6 +1114,7 @@ mod tests {
     use metrics_util::MetricKind;
     use metrics_util::debugging::{DebugValue, DebuggingRecorder};
     use s3s::dto::{LifecycleRuleFilter, TransitionStorageClass};
+    use serial_test::serial;
     use std::sync::Arc;
     use time::macros::datetime;
 
@@ -1898,6 +1899,7 @@ mod tests {
     }
 
     #[tokio::test]
+    #[serial]
     async fn eval_inner_expires_latest_object_after_days_due() {
         let base_time = datetime!(2025-01-15 10:30:45 UTC);
         let lc = BucketLifecycleConfiguration {
@@ -2113,6 +2115,7 @@ mod tests {
     }
 
     #[tokio::test]
+    #[serial]
     async fn eval_inner_does_not_panic_on_many_equal_due_events() {
         let base_time = OffsetDateTime::from_unix_timestamp(1_000_000).unwrap();
         // Many enabled rules that all yield a DeleteAction with an identical `due`.