diff --git a/dev/requirements.txt b/dev/requirements.txt
index df0f4024..6f528087 100644
--- a/dev/requirements.txt
+++ b/dev/requirements.txt
@@ -10,8 +10,8 @@ ocifs==1.3.4
 webdav4[fsspec]==0.10.0
 # gfrivefs @ git+https://github.com/fsspec/gdrivefs@master broken ...
 morefs[asynclocalfs]==0.2.2
-dvc==3.65.0
-huggingface_hub==1.2.3
+dvc==3.66.1
+huggingface_hub==1.3.7
 lakefs-spec==0.12.0
 ossfs==2025.5.0
 fsspec-xrootd==0.5.1
diff --git a/upath/_flavour_sources.py b/upath/_flavour_sources.py
index f973de82..324f66aa 100644
--- a/upath/_flavour_sources.py
+++ b/upath/_flavour_sources.py
@@ -341,8 +341,8 @@ class DataFileSystemFlavour(AbstractFileSystemFlavour):
     __orig_version__ = '2025.10.0'
     protocol = ('data',)
     root_marker = ''
-    sep = ""  # type: ignore[assignment]
-    altsep = " "  # type: ignore[assignment]
+    sep = ''  # type: ignore[assignment]
+    altsep = ' '  # type: ignore[assignment]
 
 
 class DatabricksFileSystemFlavour(AbstractFileSystemFlavour):
@@ -630,7 +630,7 @@ def _get_kwargs_from_urls(path):
 
 class HfFileSystemFlavour(AbstractFileSystemFlavour):
     __orig_class__ = 'huggingface_hub.hf_file_system.HfFileSystem'
-    __orig_version__ = '1.2.3'
+    __orig_version__ = '1.3.7'
     protocol = ('hf',)
     root_marker = ''
     sep = '/'
@@ -1027,7 +1027,7 @@ def _strip_protocol(cls, path):
 
 class _DVCFileSystemFlavour(AbstractFileSystemFlavour):
     __orig_class__ = 'dvc.fs.dvc._DVCFileSystem'
-    __orig_version__ = '3.65.0'
+    __orig_version__ = '3.66.1'
     protocol = ('dvc',)
     root_marker = '/'
     sep = '/'