diff --git a/src/types/misc/notification_subject_type.rs b/src/types/misc/notification_subject_type.rs
index 79a54ce..453823d 100644
--- a/src/types/misc/notification_subject_type.rs
+++ b/src/types/misc/notification_subject_type.rs
@@ -32,28 +32,28 @@ mod tests {
 
     #[test]
     fn deserialize_notify_subject_type_issue() {
-        let json_data = r#""Issue""#;
+        let json_data = r#""issue""#;
         let notify_subject_type: NotifySubjectType = serde_json::from_str(json_data).unwrap();
         assert_eq!(notify_subject_type, NotifySubjectType::Issue);
     }
 
     #[test]
     fn deserialize_notify_subject_type_pull_request() {
-        let json_data = r#""Pull""#;
+        let json_data = r#""pull""#;
         let notify_subject_type: NotifySubjectType = serde_json::from_str(json_data).unwrap();
         assert_eq!(notify_subject_type, NotifySubjectType::Pull);
     }
 
     #[test]
     fn deserialize_notify_subject_type_commit() {
-        let json_data = r#""Commit""#;
+        let json_data = r#""commit""#;
         let notify_subject_type: NotifySubjectType = serde_json::from_str(json_data).unwrap();
         assert_eq!(notify_subject_type, NotifySubjectType::Commit);
     }
 
     #[test]
     fn deserialize_notify_subject_type_repository() {
-        let json_data = r#""Repository""#;
+        let json_data = r#""repository""#;
         let notify_subject_type: NotifySubjectType = serde_json::from_str(json_data).unwrap();
         assert_eq!(notify_subject_type, NotifySubjectType::Repository);
     }
diff --git a/test_data/example_notification_subject.json b/test_data/example_notification_subject.json
index ac2cd26..b5e13ed 100644
--- a/test_data/example_notification_subject.json
+++ b/test_data/example_notification_subject.json
@@ -4,6 +4,6 @@
   "latest_comment_url": "https://api.example.com/issues/123/comments/456",
   "state": "open",
   "title": "Example Issue",
-  "type": "Issue",
+  "type": "issue",
   "url": "https://api.example.com/issues/123"
 }
diff --git a/test_data/example_notification_thread.json b/test_data/example_notification_thread.json
index 997d646..e9497fd 100644
--- a/test_data/example_notification_thread.json
+++ b/test_data/example_notification_thread.json
@@ -89,7 +89,7 @@
     "latest_comment_url": "https://api.example.com/issues/123/comments/456",
     "state": "open",
     "title": "Example Issue",
-    "type": "Issue",
+    "type": "issue",
     "url": "https://api.example.com/issues/123"
   },
   "unread": true,