diff --git a/rhodecode/lib/archive_cache/backends/objectstore_cache.py b/rhodecode/lib/archive_cache/backends/objectstore_cache.py
--- a/rhodecode/lib/archive_cache/backends/objectstore_cache.py
+++ b/rhodecode/lib/archive_cache/backends/objectstore_cache.py
@@ -146,7 +146,9 @@ class ObjectStoreCache(BaseCache):
 
         log.debug('Initializing %s archival cache instance', self)
 
-        fs = fsspec.filesystem('s3', anon=False, endpoint_url=endpoint_url, key=key, secret=secret, region=region)
+        fs = fsspec.filesystem(
+            's3', anon=False, endpoint_url=endpoint_url, key=key, secret=secret, client_kwargs={'region_name': region}
+        )
 
         # init main bucket
         if not fs.exists(self._bucket):