diff --git a/shard.lock b/shard.lock
index 945d2efd..909da149 100644
--- a/shard.lock
+++ b/shard.lock
@@ -131,7 +131,7 @@ shards:
 
   place_calendar:
     git: https://github.com/placeos/calendar.git
-    version: 4.26.0
+    version: 4.28.0
 
   placeos:
     git: https://github.com/placeos/crystal-client.git