diff --git a/.changeset/v6-remove-5x-deprecations.md b/.changeset/v6-remove-5x-deprecations.md
new file mode 100644
index 00000000..7cde3baa
--- /dev/null
+++ b/.changeset/v6-remove-5x-deprecations.md
@@ -0,0 +1,6 @@
+---
+"posthog_flutter": major
+---
+
+- **Breaking:** remove `Posthog().enable()` and `Posthog().disable()` — use `optIn()` and `optOut()`
+- **Breaking:** remove `PostHogConfig.sendFeatureFlagEvents` — use `sendFeatureFlagEvent`
diff --git a/api/posthog_flutter.api.json b/api/posthog_flutter.api.json
index aa0a9fde..459d349e 100644
--- a/api/posthog_flutter.api.json
+++ b/api/posthog_flutter.api.json
@@ -2195,17 +2195,6 @@
                         "relativePath": "lib/src/posthog_config.dart",
                         "typeName": "bool"
                     },
-                    {
-                        "entryPoints": [],
-                        "isDeprecated": true,
-                        "isExperimental": false,
-                        "isReadable": true,
-                        "isStatic": false,
-                        "isWriteable": true,
-                        "name": "sendFeatureFlagEvents",
-                        "relativePath": "lib/src/posthog_config.dart",
-                        "typeName": "bool"
-                    },
                     {
                         "entryPoints": [],
                         "isDeprecated": false,
@@ -4286,30 +4275,6 @@
                         "type": "method",
                         "typeParameterNames": []
                     },
-                    {
-                        "entryPoints": [],
-                        "isDeprecated": true,
-                        "isExperimental": false,
-                        "isStatic": false,
-                        "name": "disable",
-                        "parameters": [],
-                        "relativePath": "lib/src/posthog.dart",
-                        "returnTypeName": "Future<void>",
-                        "type": "method",
-                        "typeParameterNames": []
-                    },
-                    {
-                        "entryPoints": [],
-                        "isDeprecated": true,
-                        "isExperimental": false,
-                        "isStatic": false,
-                        "name": "enable",
-                        "parameters": [],
-                        "relativePath": "lib/src/posthog.dart",
-                        "returnTypeName": "Future<void>",
-                        "type": "method",
-                        "typeParameterNames": []
-                    },
                     {
                         "entryPoints": [],
                         "isDeprecated": false,
diff --git a/posthog_flutter/lib/src/posthog.dart b/posthog_flutter/lib/src/posthog.dart
index e444c4bc..847cbcec 100644
--- a/posthog_flutter/lib/src/posthog.dart
+++ b/posthog_flutter/lib/src/posthog.dart
@@ -398,18 +398,6 @@ class Posthog {
     return _posthog.enable();
   }
 
-  /// Opts the current user out of data collection.
-  @Deprecated(
-    'Use optOut() instead. This will be removed in the next major version.',
-  )
-  Future<void> disable() => optOut();
-
-  /// Opts the current user back in to data collection.
-  @Deprecated(
-    'Use optIn() instead. This will be removed in the next major version.',
-  )
-  Future<void> enable() => optIn();
-
   /// Returns whether the current user has opted out of data collection.
   Future<bool> isOptOut() => _posthog.isOptOut();
 
diff --git a/posthog_flutter/lib/src/posthog_config.dart b/posthog_flutter/lib/src/posthog_config.dart
index 5bd9230b..78b2c2c8 100644
--- a/posthog_flutter/lib/src/posthog_config.dart
+++ b/posthog_flutter/lib/src/posthog_config.dart
@@ -124,17 +124,6 @@ class PostHogConfig {
   /// Defaults to `true`.
   var sendFeatureFlagEvent = true;
 
-  /// Deprecated alias for [sendFeatureFlagEvent].
-  @Deprecated(
-    'Use sendFeatureFlagEvent instead. This will be removed in the next major version.',
-  )
-  bool get sendFeatureFlagEvents => sendFeatureFlagEvent;
-
-  @Deprecated(
-    'Use sendFeatureFlagEvent instead. This will be removed in the next major version.',
-  )
-  set sendFeatureFlagEvents(bool value) => sendFeatureFlagEvent = value;
-
   /// Whether feature flags are loaded when the SDK starts.
   ///
   /// Defaults to `true`, which means every SDK start issues a `/flags` request.
diff --git a/posthog_flutter/test/posthog_test.dart b/posthog_flutter/test/posthog_test.dart
index 7c249234..fcec7dcf 100644
--- a/posthog_flutter/test/posthog_test.dart
+++ b/posthog_flutter/test/posthog_test.dart
@@ -161,16 +161,6 @@ void main() {
   });
 
   group('PostHogConfig', () {
-    test('sendFeatureFlagEvents forwards to sendFeatureFlagEvent', () {
-      final config = PostHogConfig('test_project_token');
-
-      // ignore: deprecated_member_use_from_same_package
-      config.sendFeatureFlagEvents = false;
-
-      expect(config.sendFeatureFlagEvent, isFalse);
-      expect(config.toMap()['sendFeatureFlagEvents'], isFalse);
-    });
-
     test('trims whitespace-sensitive config values in config and toMap', () {
       final config = PostHogConfig(' \n test_project_token\t ');
       config.host = ' \nhttps://eu.i.posthog.com/\t ';