diff --git a/src/dagster_ray/_base/cluster_sharing_lock.py b/src/dagster_ray/_base/cluster_sharing_lock.py
index 552f868..dbaf814 100644
--- a/src/dagster_ray/_base/cluster_sharing_lock.py
+++ b/src/dagster_ray/_base/cluster_sharing_lock.py
@@ -18,6 +18,10 @@ class ClusterSharingLock(BaseModel):
     def identifier(self) -> str:
         return f"{self.run_id}-{self.step_key}"
 
+    @property
+    def tag(self) -> str:
+        return f"dagster/lock-{self.identifier}"[:63]  # 63 is the limit for k8s
+
     @property
     def expired_at(self) -> datetime:
         return self.created_at + timedelta(seconds=self.ttl_seconds)
diff --git a/src/dagster_ray/kuberay/resources/raycluster.py b/src/dagster_ray/kuberay/resources/raycluster.py
index 096573b..91e3555 100644
--- a/src/dagster_ray/kuberay/resources/raycluster.py
+++ b/src/dagster_ray/kuberay/resources/raycluster.py
@@ -266,7 +266,7 @@ def get_sharing_lock_annotations(self, context: AnyDagsterContext) -> dict[str,
                     ttl_seconds=self.cluster_sharing.ttl_seconds,
                     created_at=datetime.now(),
                 )
-                annotations[f"dagster/lock-{lock.identifier}"] = lock.model_dump_json()
+                annotations[lock.tag] = lock.model_dump_json()
         return annotations
 
     def get_cluster_sharing_alive_locks(self, context: AnyDagsterContext) -> Sequence[ClusterSharingLock]:
diff --git a/src/dagster_ray/kuberay/utils.py b/src/dagster_ray/kuberay/utils.py
index ad96af5..d9f6966 100644
--- a/src/dagster_ray/kuberay/utils.py
+++ b/src/dagster_ray/kuberay/utils.py
@@ -21,7 +21,7 @@ def normalize_k8s_label_values(labels: dict[str, str]) -> dict[str, str]:
     - Max 63 characters
     - Empty string is valid
 
-    Additionally, key starting with `dagster/` are replaced with `dagster.io/`
+    Additionally, key starting with `dagster.io/` are replaced with `dagster/`
     """
     normalized = {}