diff --git a/Cargo.toml b/Cargo.toml
index 3d19ce0..70db905 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "lockmap"
-version = "0.2.0"
+version = "0.2.1"
 edition = "2021"
 
 authors = ["SF-Zhou <sfzhou.scut@gmail.com>"]
diff --git a/src/lockmap.rs b/src/lockmap.rs
index 6442717..acf73b6 100644
--- a/src/lockmap.rs
+++ b/src/lockmap.rs
@@ -699,8 +699,10 @@ pub struct Entry<'a, K: Eq + Hash, V> {
 }
 
 // SAFETY: The guard holds a per-key mutex lock and a valid, ref-counted pointer.
-unsafe impl<K: Eq + Hash + Send, V: Send> Send for Entry<'_, K, V> {}
-unsafe impl<K: Eq + Hash + Send + Sync, V: Send + Sync> Sync for Entry<'_, K, V> {}
+// Entry is intentionally !Send — like MutexGuard, it should not be moved across threads.
+// For Sync, only K: Sync and V: Sync are needed: sharing &Entry across threads only
+// requires shared references (&K, &Option<V>) to be safe to share, not ownership transfer.
+unsafe impl<K: Eq + Hash + Sync, V: Sync> Sync for Entry<'_, K, V> {}
 
 impl<K: Eq + Hash, V> Entry<'_, K, V> {
     /// Returns a reference to the entry's key.
diff --git a/src/lru_lockmap.rs b/src/lru_lockmap.rs
index a95a7c4..ddf6c94 100644
--- a/src/lru_lockmap.rs
+++ b/src/lru_lockmap.rs
@@ -809,8 +809,10 @@ pub struct LruEntry<'a, K: Eq + Hash, V> {
 }
 
 // SAFETY: The guard holds a per-key mutex lock and a valid, ref-counted pointer.
-unsafe impl<K: Eq + Hash + Send, V: Send> Send for LruEntry<'_, K, V> {}
-unsafe impl<K: Eq + Hash + Send + Sync, V: Send + Sync> Sync for LruEntry<'_, K, V> {}
+// LruEntry is intentionally !Send — like MutexGuard, it should not be moved across threads.
+// For Sync, only K: Sync and V: Sync are needed: sharing &LruEntry across threads only
+// requires shared references (&K, &Option<V>) to be safe to share, not ownership transfer.
+unsafe impl<K: Eq + Hash + Sync, V: Sync> Sync for LruEntry<'_, K, V> {}
 
 impl<K: Eq + Hash, V> LruEntry<'_, K, V> {
     /// Returns a reference to the entry's key.