diff --git a/crates/loro-core/src/loro.rs b/crates/loro-core/src/loro.rs
index d85051bb..54ef908d 100644
--- a/crates/loro-core/src/loro.rs
+++ b/crates/loro-core/src/loro.rs
@@ -113,7 +113,7 @@ impl LoroCore {
             .write()
             .unwrap()
             .hierarchy
-            .lock()
+            .try_lock()
             .unwrap()
             .subscribe_root(observer)
     }
@@ -123,7 +123,7 @@ impl LoroCore {
             .write()
             .unwrap()
             .hierarchy
-            .lock()
+            .try_lock()
             .unwrap()
             .unsubscribe_root(subscription)
     }