diff --git a/HISTORY.rst b/HISTORY.rst
index 9ff2ca95..bf39b370 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -3,6 +3,13 @@
 Release History
 ---------------
 
+4.1.0 (?)
++++++++++
+
+**Bugfixes**
+
+- Use mtime from files.xml if no Last-Modified header is available (e.g. VTT files).
+
 4.0.1 (2024-04-15)
 ++++++++++++++++++
 
diff --git a/internetarchive/__version__.py b/internetarchive/__version__.py
index 1a3bef53..4658fd53 100644
--- a/internetarchive/__version__.py
+++ b/internetarchive/__version__.py
@@ -1 +1 @@
-__version__ = '4.0.1'
+__version__ = '4.1.0.dev1'
diff --git a/internetarchive/files.py b/internetarchive/files.py
index 4981651e..020b9fa9 100644
--- a/internetarchive/files.py
+++ b/internetarchive/files.py
@@ -252,7 +252,7 @@ def download(# noqa: max-complexity=38
                     dt = parsedate_to_datetime(last_mod_header)
                     last_mod_mtime = dt.timestamp()
                 else:
-                    last_mod_mtime = 0
+                    last_mod_mtime = self.mtime
 
                 response.raise_for_status()