diff --git a/CHANGELOG.md b/CHANGELOG.md
index 610054c..59bcbea 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [1.0.9] - 2026-01-04
+
+### Fixed
+- Fixed OIDC callback Riverpod state modification error
+  - Deferred callback processing to `addPostFrameCallback` to avoid modifying state during widget build
+
 ## [1.0.8] - 2026-01-04
 
 ### Changed
diff --git a/lib/routing/app_router.dart b/lib/routing/app_router.dart
index 0e4c950..eb4a7fa 100644
--- a/lib/routing/app_router.dart
+++ b/lib/routing/app_router.dart
@@ -286,7 +286,10 @@ class _OidcCallbackPageState extends ConsumerState<_OidcCallbackPage> {
   @override
   void initState() {
     super.initState();
-    _processCallback();
+    // Defer callback processing to avoid Riverpod state modification during build
+    WidgetsBinding.instance.addPostFrameCallback((_) {
+      _processCallback();
+    });
   }
 
   Future<void> _processCallback() async {
diff --git a/pubspec.yaml b/pubspec.yaml
index 3e30805..ea11c5b 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: 1.0.8+1
+version: 1.0.9+1
 
 environment:
   sdk: ^3.10.4