diff --git a/HISTORY.rst b/HISTORY.rst
index 84a7eed0..3eec023c 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -3,6 +3,14 @@
 Release History
 ---------------
 
+4.0.0 (2024-04-12)
+++++++++++++++++++
+
+**Features and Improvements**
+
+- Partially downloaded files will now automatically resume where they left off when retried.
+- Use ``Last-Modified`` header to set all mtimes (this includes files.xml now).
+
 3.7.0 (2024-03-19)
 ++++++++++++++++++
 
diff --git a/internetarchive/__version__.py b/internetarchive/__version__.py
index 8c3336cc..c671f80f 100644
--- a/internetarchive/__version__.py
+++ b/internetarchive/__version__.py
@@ -1 +1 @@
-__version__ = '3.7.0'
+__version__ = '4.0.0.dev1'