diff --git a/mdrsclient/commands/download.py b/mdrsclient/commands/download.py
index f9d7e0d..085d49d 100644
--- a/mdrsclient/commands/download.py
+++ b/mdrsclient/commands/download.py
@@ -98,9 +98,10 @@ class DownloadCommand(BaseCommand):
                     cls.__multiple_download(connection, context)
                     return
                 else:
-                    folder = r_parent_folder.find_sub_folder(r_basename)
-                    if folder is None:
+                    folder_simple = r_parent_folder.find_sub_folder(r_basename)
+                    if folder_simple is None:
                         raise IllegalArgumentException(f"File or folder `{subpath_clean}` not found.")
+                    folder = FoldersApi(connection).retrieve(folder_simple.id)
                     is_folder = True
 
             # For a DOI target the whole folder is the download target.
diff --git a/pyproject.toml b/pyproject.toml
index 13c4c0e..d013f13 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "mdrs-client-python"
-version = "1.3.15"
+version = "1.3.16"
 description = "The mdrs-client-python is python library and a command-line client for up- and downloading files to and from MDRS based repository."
 authors = ["Yoshihiro OKUMURA <yoshihiro.okumura@riken.jp>"]
 license = "MIT"
@@ -24,20 +24,20 @@ packages = [
 
 [tool.poetry.dependencies]
 python = "^3.10"
-requests = "^2.32.3"
+requests = "^2.34.2"
 requests-toolbelt = "^1.0.0"
 python-dotenv = "^1.1.0"
-pydantic = "^2.11.4"
-pydantic-settings = "^2.9.1"
-PyJWT = "^2.10.1"
-validators = "^0.34.0"
+pydantic = "^2.13.4"
+pydantic-settings = "^2.14.1"
+PyJWT = "^2.13.0"
+validators = "^0.35.0"
 
 [tool.poetry.group.dev.dependencies]
-black = "^24.10.0"
+black = "^26.5.1"
 flake8 = "^7.2.0"
 Flake8-pyproject = "^1.2.3"
-isort = "^5.13.2"
-pyright = "^1.1.400"
+isort = "^8.0.1"
+pyright = "^1.1.401"
 
 [tool.poetry.scripts]
 mdrs = 'mdrsclient.__main__:main'