diff --git a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/huami/zeppos/services/ZeppOsCalendarService.java b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/huami/zeppos/services/ZeppOsCalendarService.java
index c94eb3448..420e57ac6 100644
--- a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/huami/zeppos/services/ZeppOsCalendarService.java
+++ b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/huami/zeppos/services/ZeppOsCalendarService.java
@@ -23,8 +23,10 @@ import java.nio.ByteBuffer;
 import java.nio.ByteOrder;
 import java.nio.charset.StandardCharsets;
 
+import nodomain.freeyourgadget.gadgetbridge.deviceevents.GBDeviceEventUpdatePreferences;
 import nodomain.freeyourgadget.gadgetbridge.model.CalendarEventSpec;
 import nodomain.freeyourgadget.gadgetbridge.service.btle.BLETypeConversions;
+import nodomain.freeyourgadget.gadgetbridge.service.btle.TransactionBuilder;
 import nodomain.freeyourgadget.gadgetbridge.service.devices.huami.Huami2021Support;
 import nodomain.freeyourgadget.gadgetbridge.service.devices.huami.zeppos.AbstractZeppOsService;
 import nodomain.freeyourgadget.gadgetbridge.util.StringUtils;
@@ -43,6 +45,10 @@ public class ZeppOsCalendarService extends AbstractZeppOsService {
     public static final byte CMD_DELETE_EVENT = 0x09;
     public static final byte CMD_DELETE_EVENT_ACK = 0x0a;
 
+    public static final String PREF_VERSION = "zepp_os_calendar_version";
+
+    private int version = -1;
+
     public ZeppOsCalendarService(final Huami2021Support support) {
         super(support);
     }
@@ -57,9 +63,27 @@ public class ZeppOsCalendarService extends AbstractZeppOsService {
         return false;
     }
 
+    @Override
+    public void initialize(final TransactionBuilder builder) {
+        requestCapabilities(builder);
+    }
+
+    public void requestCapabilities(final TransactionBuilder builder) {
+        write(builder, CMD_CAPABILITIES_REQUEST);
+    }
+
     @Override
     public void handlePayload(final byte[] payload) {
         switch (payload[0]) {
+            case CMD_CAPABILITIES_RESPONSE:
+                version = payload[1];
+                getSupport().evaluateGBDeviceEvent(new GBDeviceEventUpdatePreferences(PREF_VERSION, version));
+                if (version != 1) {
+                    LOG.warn("Unsupported calendar service version {}", version);
+                    return;
+                }
+                LOG.info("Calendar service version={}", version);
+                break;
             case CMD_EVENTS_RESPONSE:
                 LOG.info("Got calendar events from band");
                 decodeAndUpdateCalendarEvents(payload);