diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 27b4ddb..f6cc403 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -12,7 +12,7 @@ jobs:
           fetch-depth: 1
       - uses: actions/setup-python@v1
         with:
-          python-version: "3.12.8"
+          python-version: "3.12.9"
       - name: install dependencies and test
         run: |
           cd $GITHUB_WORKSPACE
diff --git a/ci/run.py b/ci/run.py
index 579ec25..b385041 100755
--- a/ci/run.py
+++ b/ci/run.py
@@ -54,7 +54,7 @@ def make_build_env():
 
     _env_add('PATH', join(PREFIX, 'bin'))
     if on_github_actions():
-        _env_add('PYTHONPATH', join(os.environ.get('RUNNER_TOOL_CACHE'), 'Python/3.12.8/x64/lib/python3.12/site-packages'))
+        _env_add('PYTHONPATH', join(os.environ.get('RUNNER_TOOL_CACHE'), 'Python/3.12.9/x64/lib/python3.12/site-packages'))
     _env_add('PYTHONPATH', join(PREFIX, 'lib/python3.12/site-packages'))
     _env_add('PKG_CONFIG_PATH', join(PREFIX, 'lib', 'pkgconfig'))
     _env_add('PKG_CONFIG_PATH', join(PREFIX, 'lib64', 'pkgconfig'))
diff --git a/fileserver/option/option.go b/fileserver/option/option.go
index 967a111..356a041 100644
--- a/fileserver/option/option.go
+++ b/fileserver/option/option.go
@@ -28,7 +28,6 @@ var (
 	Host                   string
 	Port                   uint32
 	MaxUploadSize          uint64
-	MaxDownloadDirSize     uint64
 	FsIdListRequestTimeout int64
 	// Block size for indexing uploaded files
 	FixedBlockSize uint64
@@ -73,7 +72,6 @@ var (
 func initDefaultOptions() {
 	Host = "0.0.0.0"
 	Port = 8082
-	MaxDownloadDirSize = 100 * (1 << 20)
 	FixedBlockSize = 1 << 23
 	MaxIndexingThreads = 1
 	WebTokenExpireTime = 7200
@@ -161,7 +159,7 @@ func parseFileServerSection(section *ini.Section) {
 	if key, err := section.GetKey("max_upload_size"); err == nil {
 		size, err := key.Uint()
 		if err == nil {
-			MaxUploadSize = uint64(size) * (1 << 20)
+			MaxUploadSize = uint64(size) * 1000000
 		}
 	}
 	if key, err := section.GetKey("max_indexing_threads"); err == nil {
diff --git a/python/seaserv/service.py b/python/seaserv/service.py
index 733fbcd..085d80d 100644
--- a/python/seaserv/service.py
+++ b/python/seaserv/service.py
@@ -69,15 +69,15 @@ MAX_UPLOAD_FILE_SIZE = None # Defaults to no limit
 try:
     max_upload_size_mb = int(get_fileserver_option('max_upload_size', 0))
     if max_upload_size_mb > 0:
-        MAX_UPLOAD_FILE_SIZE = max_upload_size_mb * (2 ** 20)
+        MAX_UPLOAD_FILE_SIZE = max_upload_size_mb * 1000000
 except ValueError:
     pass
 
-MAX_DOWNLOAD_DIR_SIZE = 100 * (2 ** 20) # Default max size of a downloadable dir
+MAX_DOWNLOAD_DIR_SIZE = 100 * 1000000 # Default max size of a downloadable dir
 try:
     max_download_dir_size_mb = int(get_fileserver_option('max_download_dir_size', 0))
     if max_download_dir_size_mb > 0:
-        MAX_DOWNLOAD_DIR_SIZE = max_download_dir_size_mb * (2 ** 20)
+        MAX_DOWNLOAD_DIR_SIZE = max_download_dir_size_mb * 1000000
 except ValueError:
     pass
 
diff --git a/server/upload-file.c b/server/upload-file.c
index 5316c6e..d7a946e 100755
--- a/server/upload-file.c
+++ b/server/upload-file.c
@@ -241,7 +241,7 @@ check_tmp_file_list (GList *tmp_files, int *error_code)
     max_upload_size = seaf_cfg_manager_get_config_int64 (seaf->cfg_mgr, "fileserver",
                                                          "max_upload_size");
     if (max_upload_size > 0)
-        max_upload_size = max_upload_size * ((gint64)1 << 20);
+        max_upload_size = max_upload_size * 1000000;
     else
         max_upload_size = -1;
     
diff --git a/server/zip-download-mgr.c b/server/zip-download-mgr.c
index f89846f..965fea8 100644
--- a/server/zip-download-mgr.c
+++ b/server/zip-download-mgr.c
@@ -16,7 +16,7 @@
 #define MAX_ZIP_THREAD_NUM 5
 #define SCAN_PROGRESS_INTERVAL 24 * 3600 // 1 day
 #define PROGRESS_TTL 5 * 3600 // 5 hours
-#define DEFAULT_MAX_DOWNLOAD_DIR_SIZE 100 * ((gint64)1 << 20) /* 100MB */
+#define DEFAULT_MAX_DOWNLOAD_DIR_SIZE 100 * 1000000 /* 100MB */
 
 typedef struct ZipDownloadMgrPriv {
     pthread_mutex_t progress_lock;
@@ -471,7 +471,7 @@ validate_download_size (DownloadObj *obj, GError **error)
     max_download_dir_size = seaf_cfg_manager_get_config_int64 (seaf->cfg_mgr, "fileserver",
                                                                "max_download_dir_size");
     if (max_download_dir_size > 0)
-        max_download_dir_size = max_download_dir_size * ((gint64)1 << 20);
+        max_download_dir_size = max_download_dir_size * 1000000;
     else
         max_download_dir_size = DEFAULT_MAX_DOWNLOAD_DIR_SIZE;