diff --git a/setup.py b/setup.py
index 0711600a..4e0d771f 100644
--- a/setup.py
+++ b/setup.py
@@ -10,7 +10,7 @@
 
 setup(
     name='ttconv', 
-    version='1.0.3b3',
+    version='1.0.3rc1',
     description='Library for conversion of common timed text formats',
     long_description=long_description,
     long_description_content_type='text/markdown',