diff --git a/lib/http/converter/capabilities_converter.dart b/lib/http/converter/capabilities_converter.dart
index d8af6fc..12c6305 100644
--- a/lib/http/converter/capabilities_converter.dart
+++ b/lib/http/converter/capabilities_converter.dart
@@ -1,4 +1,5 @@
 import 'package:built_collection/built_collection.dart';
+import 'package:jmap_dart_client/jmap/core/capability/calendar_event_capability.dart';
 import 'package:jmap_dart_client/jmap/core/capability/capability_identifier.dart';
 import 'package:jmap_dart_client/jmap/core/capability/capability_properties.dart';
 import 'package:jmap_dart_client/jmap/core/capability/core_capability.dart';
@@ -22,6 +23,7 @@ class CapabilitiesConverter {
         CapabilityIdentifier.jmapMail: MailCapability.deserialize,
         CapabilityIdentifier.jmapCore: CoreCapability.deserialize,
         CapabilityIdentifier.jmapSubmission: SubmissionCapability.deserialize,
+        CapabilityIdentifier.jamesCalendarEvent: CalendarEventCapability.deserialize,
         CapabilityIdentifier.jmapVacationResponse: VacationCapability.deserialize,
         CapabilityIdentifier.jmapWebSocket: WebSocketCapability.deserialize,
         CapabilityIdentifier.jmapMdn: MdnCapability.deserialize
diff --git a/lib/jmap/core/capability/calendar_event_capability.dart b/lib/jmap/core/capability/calendar_event_capability.dart
new file mode 100644
index 0000000..839fccb
--- /dev/null
+++ b/lib/jmap/core/capability/calendar_event_capability.dart
@@ -0,0 +1,23 @@
+import 'package:jmap_dart_client/jmap/core/capability/capability_properties.dart';
+import 'package:json_annotation/json_annotation.dart';
+
+part 'calendar_event_capability.g.dart';
+
+@JsonSerializable(includeIfNull: false)
+class CalendarEventCapability extends CapabilityProperties {
+  final List<String>? replySupportedLanguage;
+
+  CalendarEventCapability({this.replySupportedLanguage});
+  
+  factory CalendarEventCapability.fromJson(Map<String, dynamic> json) 
+    => _$CalendarEventCapabilityFromJson(json);
+
+  Map<String, dynamic> toJson() => _$CalendarEventCapabilityToJson(this);
+
+  static CalendarEventCapability deserialize(Map<String, dynamic> json) {
+    return CalendarEventCapability.fromJson(json);
+  }
+  
+  @override
+  List<Object?> get props => [replySupportedLanguage];
+}
\ No newline at end of file
diff --git a/lib/jmap/core/capability/calendar_event_capability.g.dart b/lib/jmap/core/capability/calendar_event_capability.g.dart
new file mode 100644
index 0000000..0757001
--- /dev/null
+++ b/lib/jmap/core/capability/calendar_event_capability.g.dart
@@ -0,0 +1,29 @@
+// GENERATED CODE - DO NOT MODIFY BY HAND
+
+part of 'calendar_event_capability.dart';
+
+// **************************************************************************
+// JsonSerializableGenerator
+// **************************************************************************
+
+CalendarEventCapability _$CalendarEventCapabilityFromJson(
+        Map<String, dynamic> json) =>
+    CalendarEventCapability(
+      replySupportedLanguage: (json['replySupportedLanguage'] as List<dynamic>?)
+          ?.map((e) => e as String)
+          .toList(),
+    );
+
+Map<String, dynamic> _$CalendarEventCapabilityToJson(
+    CalendarEventCapability instance) {
+  final val = <String, dynamic>{};
+
+  void writeNotNull(String key, dynamic value) {
+    if (value != null) {
+      val[key] = value;
+    }
+  }
+
+  writeNotNull('replySupportedLanguage', instance.replySupportedLanguage);
+  return val;
+}
diff --git a/test/jmap/core/session/session_test.dart b/test/jmap/core/session/session_test.dart
index 00bc5b5..e10e7d5 100644
--- a/test/jmap/core/session/session_test.dart
+++ b/test/jmap/core/session/session_test.dart
@@ -4,6 +4,7 @@ import 'package:flutter_test/flutter_test.dart';
 import 'package:jmap_dart_client/http/converter/capabilities_converter.dart';
 import 'package:jmap_dart_client/jmap/account_id.dart';
 import 'package:jmap_dart_client/jmap/core/account/account.dart';
+import 'package:jmap_dart_client/jmap/core/capability/calendar_event_capability.dart';
 import 'package:jmap_dart_client/jmap/core/capability/capability_identifier.dart';
 import 'package:jmap_dart_client/jmap/core/capability/core_capability.dart';
 import 'package:jmap_dart_client/jmap/core/capability/default_capability.dart';
@@ -30,6 +31,12 @@ void main() {
             "maxDelayedSend": 0,
             "submissionExtensions": {}
           },
+          "com:linagora:params:calendar:event": {
+            "replySupportedLanguage": [
+                "en",
+                "fr"
+            ]
+          },
           "urn:ietf:params:jmap:core": {
             "maxSizeUpload": 20971520,
             "maxConcurrentUpload": 4,
@@ -116,6 +123,7 @@ void main() {
         },
         "primaryAccounts": {
           "urn:ietf:params:jmap:submission": "29883977c13473ae7cb7678ef767cbfbaffc8a44a6e463d971d23a65c1dc4af6",
+          "com:linagora:params:calendar:event": "29883977c13473ae7cb7678ef767cbfbaffc8a44a6e463d971d23a65c1dc4af6",
           "urn:ietf:params:jmap:websocket": "29883977c13473ae7cb7678ef767cbfbaffc8a44a6e463d971d23a65c1dc4af6",
           "urn:ietf:params:jmap:core": "29883977c13473ae7cb7678ef767cbfbaffc8a44a6e463d971d23a65c1dc4af6",
           "urn:ietf:params:jmap:mail": "29883977c13473ae7cb7678ef767cbfbaffc8a44a6e463d971d23a65c1dc4af6",
@@ -138,6 +146,9 @@ void main() {
             maxDelayedSend: UnsignedInt(0),
             submissionExtensions: {}
           ),
+          CapabilityIdentifier.jamesCalendarEvent: CalendarEventCapability(
+            replySupportedLanguage: ["en", "fr"]
+          ),
           CapabilityIdentifier.jmapCore: CoreCapability(
             maxSizeUpload: UnsignedInt(20971520),
             maxConcurrentUpload: UnsignedInt(4),
@@ -204,6 +215,7 @@ void main() {
         },
         {
           CapabilityIdentifier.jmapSubmission: AccountId(Id('29883977c13473ae7cb7678ef767cbfbaffc8a44a6e463d971d23a65c1dc4af6')),
+          CapabilityIdentifier.jamesCalendarEvent: AccountId(Id('29883977c13473ae7cb7678ef767cbfbaffc8a44a6e463d971d23a65c1dc4af6')),
           CapabilityIdentifier.jmapWebSocket: AccountId(Id('29883977c13473ae7cb7678ef767cbfbaffc8a44a6e463d971d23a65c1dc4af6')),
           CapabilityIdentifier.jmapCore: AccountId(Id('29883977c13473ae7cb7678ef767cbfbaffc8a44a6e463d971d23a65c1dc4af6')),
           CapabilityIdentifier.jmapMail: AccountId(Id('29883977c13473ae7cb7678ef767cbfbaffc8a44a6e463d971d23a65c1dc4af6')),