diff --git a/Directory.Build.props b/Directory.Build.props
index bc3251a8..d8f87d7f 100644
--- a/Directory.Build.props
+++ b/Directory.Build.props
@@ -26,7 +26,7 @@
     <AkkaPersistenceQueryVersion>1.4.17</AkkaPersistenceQueryVersion>
     <AkkaRemoteVersion>1.4.17</AkkaRemoteVersion>
     <AkkaRemoteTestKitVersion>1.4.17</AkkaRemoteTestKitVersion>
-    <AkkaClusterVersion>1.4.17</AkkaClusterVersion>
+    <AkkaClusterVersion>1.4.21</AkkaClusterVersion>
     <AkkaClusterShardingVersion>1.4.17</AkkaClusterShardingVersion>
     <AkkaClusterToolsVersion>1.4.17</AkkaClusterToolsVersion>
     <AkkaTestKitVersion>1.4.17</AkkaTestKitVersion>