diff --git a/setup.cfg b/setup.cfg
index 0f4c12bd..2fada056 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -3,3 +3,6 @@ ignore =
     *.cfg
     bootstrap.py
     requirements_docs.txt
+
+[zest.releaser]
+python-file-with-version = src/icalendar/__init__.py