diff --git a/dependencies.properties b/dependencies.properties
index 1ddb4686..4f334b76 100644
--- a/dependencies.properties
+++ b/dependencies.properties
@@ -1 +1 @@
-core.version=2.0.2
\ No newline at end of file
+core.version=2.0.3
\ No newline at end of file
diff --git a/lib/features/config_option/data/config_option_repository.dart b/lib/features/config_option/data/config_option_repository.dart
index 5d276bc8..21cf698e 100644
--- a/lib/features/config_option/data/config_option_repository.dart
+++ b/lib/features/config_option/data/config_option_repository.dart
@@ -45,19 +45,19 @@ abstract class ConfigOptions {
 
   static final resolveDestination = PreferencesNotifier.create<bool, bool>(
     "resolve-destination",
-    true,
+    false,
   );
 
   static final ipv6Mode = PreferencesNotifier.create<IPv6Mode, String>(
     "ipv6-mode",
-    IPv6Mode.enable,
+    IPv6Mode.disable,
     mapFrom: (value) => IPv6Mode.values.firstWhere((e) => e.key == value),
     mapTo: (value) => value.key,
   );
 
   static final remoteDnsAddress = PreferencesNotifier.create<String, String>(
     "remote-dns-address",
-    "udp://1.1.1.1",
+    "https://sky.rethinkdns.com/dns-query",
     validator: (value) => value.isNotBlank,
   );
 
diff --git a/libcore b/libcore
index d52ac585..3305cf7d 160000
--- a/libcore
+++ b/libcore
@@ -1 +1 @@
-Subproject commit d52ac5854b4fac64b6b7c9b5272a2a7d3bfa78ae
+Subproject commit 3305cf7d8d55b09e8e132ca414d15df29adea521