diff --git a/src/Core/Vault/Services/Implementations/CipherService.cs b/src/Core/Vault/Services/Implementations/CipherService.cs
index d6947b541..f2cb69539 100644
--- a/src/Core/Vault/Services/Implementations/CipherService.cs
+++ b/src/Core/Vault/Services/Implementations/CipherService.cs
@@ -210,6 +210,10 @@ public class CipherService : ICipherService
             AttachmentData = JsonSerializer.Serialize(data)
         });
         cipher.AddAttachment(attachmentId, data);
+
+        // Update the revision date when an attachment is added
+        cipher.RevisionDate = DateTime.UtcNow;
+
         await _pushService.PushSyncCipherUpdateAsync(cipher, null);
 
         return (attachmentId, uploadUrl);
@@ -259,6 +263,9 @@ public class CipherService : ICipherService
             throw;
         }
 
+        // Update the revision date when an attachment is added
+        cipher.RevisionDate = DateTime.UtcNow;
+
         // push
         await _pushService.PushSyncCipherUpdateAsync(cipher, null);
     }
@@ -1021,6 +1028,9 @@ public class CipherService : ICipherService
         await _attachmentStorageService.DeleteAttachmentAsync(cipher.Id, attachmentData);
         await _eventService.LogCipherEventAsync(cipher, Bit.Core.Enums.EventType.Cipher_AttachmentDeleted);
 
+        // Update the revision date when an attachment is deleted
+        cipher.RevisionDate = DateTime.UtcNow;
+
         // push
         await _pushService.PushSyncCipherUpdateAsync(cipher, null);
     }