diff --git a/analyticshub/lib/Service/DataProcessor.php b/analyticshub/lib/Service/DataProcessor.php
index 7a1a4cb..0ce9524 100644
--- a/analyticshub/lib/Service/DataProcessor.php
+++ b/analyticshub/lib/Service/DataProcessor.php
@@ -5,7 +5,7 @@ declare(strict_types=1);
 namespace OCA\AnalyticsHub\Service;
 
 use OCA\AnalyticsHub\Model\ClientConfig;
-use OCP\Util\Logger;
+use OCP\ILogger;
 
 /**
  * Data Processor Service
@@ -13,7 +13,7 @@ use OCP\Util\Logger;
  */
 class DataProcessor {
 
-    private ?Logger $logger;
+    private ?ILogger $logger;
 
     // Default thresholds
     private const DEFAULT_SIGNIFICANT_CHANGE_PCT = 20;
diff --git a/analyticshub/lib/Service/GoogleAnalyticsService.php b/analyticshub/lib/Service/GoogleAnalyticsService.php
index b5811e0..2cd3284 100644
--- a/analyticshub/lib/Service/GoogleAnalyticsService.php
+++ b/analyticshub/lib/Service/GoogleAnalyticsService.php
@@ -7,8 +7,7 @@ namespace OCA\AnalyticsHub\Service;
 use OCA\AnalyticsHub\Model\ClientConfig;
 use OCA\AnalyticsHub\AppInfo\Application;
 use OCP\IConfig;
-use OCP\Util\Logger;
-use OCP\Util\SimplePDOMapper;
+use OCP\ILogger;
 
 /**
  * Google Analytics Data API v1 Service
@@ -17,7 +16,7 @@ use OCP\Util\SimplePDOMapper;
 class GoogleAnalyticsService {
 
     private IConfig $config;
-    private ?Logger $logger;
+    private ?ILogger $logger;
     private ?DatabaseService $dbService;
 
     // GA4 API endpoints
diff --git a/analyticshub/lib/Service/LLMService.php b/analyticshub/lib/Service/LLMService.php
index 7b3dbf6..3d6eda5 100644
--- a/analyticshub/lib/Service/LLMService.php
+++ b/analyticshub/lib/Service/LLMService.php
@@ -6,7 +6,7 @@ namespace OCA\AnalyticsHub\Service;
 
 use OCA\AnalyticsHub\Model\ClientConfig;
 use OCP\IConfig;
-use OCP\Util\Logger;
+use OCP\ILogger;
 
 /**
  * LLM Service - Anthropic Claude API integration
@@ -15,7 +15,7 @@ use OCP\Util\Logger;
 class LLMService {
 
     private IConfig $config;
-    private ?Logger $logger;
+    private ?ILogger $logger;
 
     // Anthropic API endpoint
     private const ANTHROPIC_API = 'https://api.anthropic.com/v1/messages';