diff --git a/redmine_reporter/client.py b/redmine_reporter/client.py
index f3dc8b6..afa22f9 100644
--- a/redmine_reporter/client.py
+++ b/redmine_reporter/client.py
@@ -47,25 +47,22 @@ def _create_redmine() -> Redmine:
         },
     )
 
-    # Монтируем retry-адаптер на сессию для автоматических повторов
+    # Монтируем retry-адаптер на сессию для автоматических повторов.
+    # В python-redmine сессия живёт в engine, а redmine.session — контекстный менеджер.
     retry_adapter = _make_retry_adapter()
-    redmine.session.mount("https://", retry_adapter)
-    redmine.session.mount("http://", retry_adapter)
+    redmine.engine.session.mount("https://", retry_adapter)
+    redmine.engine.session.mount("http://", retry_adapter)
 
     return redmine
 
 
-def _fetch_issues_chunked(
-    redmine: Redmine, issue_ids: List[int]
-) -> List[Issue]:
+def _fetch_issues_chunked(redmine: Redmine, issue_ids: List[int]) -> List[Issue]:
     """Загружает задачи чанками, чтобы не превышать лимит длины URL (#21)."""
     all_issues: List[Issue] = []
     for i in range(0, len(issue_ids), ISSUE_ID_CHUNK_SIZE):
         chunk = issue_ids[i : i + ISSUE_ID_CHUNK_SIZE]
         issue_list_str = ",".join(str(x) for x in chunk)
-        issues = redmine.issue.filter(
-            issue_id=issue_list_str, status_id="*", sort="project:asc"
-        )
+        issues = redmine.issue.filter(issue_id=issue_list_str, status_id="*", sort="project:asc")
         all_issues.extend(issues)
     return all_issues
 
diff --git a/tests/test_client.py b/tests/test_client.py
index 71a94fe..5198a08 100644
--- a/tests/test_client.py
+++ b/tests/test_client.py
@@ -196,16 +196,14 @@ def test_fetch_mounts_retry_adapter(mock_redmine_class):
 
     fetch_issues_with_spent_time("2026-01-01", "2026-01-31")
 
-    # Проверяем, что session.mount был вызван для http:// и https://
-    mount_calls = mock_redmine.session.mount.call_args_list
+    # Проверяем, что engine.session.mount был вызван для http:// и https://
+    mount_calls = mock_redmine.engine.session.mount.call_args_list
     prefixes = [call.args[0] for call in mount_calls]
     assert "https://" in prefixes
     assert "http://" in prefixes
 
     # Проверяем retry-конфигурацию адаптера
-    https_adapter = next(
-        call.args[1] for call in mount_calls if call.args[0] == "https://"
-    )
+    https_adapter = next(call.args[1] for call in mount_calls if call.args[0] == "https://")
     max_retries = https_adapter.max_retries
     assert max_retries.total == 3
     assert 429 in max_retries.status_forcelist