diff --git a/tuf/ngclient/_internal/requests_fetcher.py b/tuf/ngclient/_internal/requests_fetcher.py
index c39c1fb2..0923e5ce 100644
--- a/tuf/ngclient/_internal/requests_fetcher.py
+++ b/tuf/ngclient/_internal/requests_fetcher.py
@@ -94,7 +94,7 @@ def _fetch(self, url: str) -> Iterator[bytes]:
         except requests.HTTPError as e:
             response.close()
             status = e.response.status_code
-            raise exceptions.DownloadHTTPError(str(e), status)
+            raise exceptions.DownloadHTTPError(str(e), status) from e
 
         return self._chunks(response)
 
diff --git a/tuf/ngclient/updater.py b/tuf/ngclient/updater.py
index 2cfccc66..faee9d2c 100644
--- a/tuf/ngclient/updater.py
+++ b/tuf/ngclient/updater.py
@@ -397,7 +397,7 @@ def _load_targets(self, role: str, parent_role: str) -> Targets:
             if metainfo is None:
                 raise exceptions.RepositoryError(
                     f"Role {role} was delegated but is not part of snapshot"
-                )
+                ) from None
 
             length = metainfo.length or self.config.targets_max_length
             version = None