diff --git a/CHANGELOG.md b/CHANGELOG.md
index d0a86bf..7a7ec97 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,13 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [1.1.11] - 2026-01-04
+
+### Fixed
+- API client providers now use `keepAlive: true` to prevent Ref invalidation
+  - Fixes "DioException [unknown]: null" error on /security/users and other API pages
+  - AuthInterceptor's stored Ref was becoming invalid when provider auto-disposed
+
 ## [1.1.10] - 2026-01-04
 
 ### Changed
diff --git a/lib/core/api/api_client.dart b/lib/core/api/api_client.dart
index 6ee647f..1c76837 100644
--- a/lib/core/api/api_client.dart
+++ b/lib/core/api/api_client.dart
@@ -9,7 +9,10 @@ import 'api_client_native.dart' if (dart.library.html) 'api_client_web.dart'
 part 'api_client.g.dart';
 
 /// Provides the Dio instance for Core API.
-@riverpod
+///
+/// Uses keepAlive to prevent auto-dispose - the AuthInterceptor stores
+/// a Ref that must remain valid for the lifetime of API requests.
+@Riverpod(keepAlive: true)
 Dio coreApiClient(Ref ref) {
   final options = BaseOptions(
     baseUrl: AppConfig.coreApiUrl,
@@ -33,7 +36,10 @@ Dio coreApiClient(Ref ref) {
 }
 
 /// Provides the Dio instance for Tatlock API.
-@riverpod
+///
+/// Uses keepAlive to prevent auto-dispose - the AuthInterceptor stores
+/// a Ref that must remain valid for the lifetime of API requests.
+@Riverpod(keepAlive: true)
 Dio tatlockApiClient(Ref ref) {
   final options = BaseOptions(
     baseUrl: AppConfig.tatlockApiUrl,
diff --git a/pubspec.yaml b/pubspec.yaml
index 8b414a0..13b19a7 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -16,7 +16,7 @@ publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 # https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
 # In Windows, build-name is used as the major, minor, and patch parts
 # of the product and file versions while build-number is used as the build suffix.
-version: 1.1.10+1
+version: 1.1.11+1
 
 environment:
   sdk: ^3.10.4