diff --git a/HISTORY.rst b/HISTORY.rst
index 517584e..a122e95 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -3,6 +3,12 @@
 Release History
 ===============
 
+1.0.4 (unreleased)
+------------------
+
+- Nothing changed yet.
+
+
 1.0.3 (2019-11-12)
 ------------------
 
diff --git a/setup.py b/setup.py
index 8d6ec4f..fc0008f 100644
--- a/setup.py
+++ b/setup.py
@@ -22,7 +22,7 @@ with open('HISTORY.rst', 'r', encoding='utf-8') as hist_file:
 
 setup(
     name='mega.py',
-    version='1.0.3',
+    version='1.0.4.dev0',
     packages=find_packages('src', exclude=('tests', )),
     package_dir={'': 'src'},
     include_package_data=True,