diff --git a/CHANGES.rst b/CHANGES.rst
index 3618ed0..1a5151f 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,8 +1,8 @@
 Changelog
 =========
 
-1.0.0 (unreleased)
-------------------
+1.0.0rc1 (unreleased)
+---------------------
 
 - Made compliant with Plone 4, Plone 5, Plone 6
   [boulch, laulaz, sgeulette]
diff --git a/setup.py b/setup.py
index e07ea86..623a2bd 100644
--- a/setup.py
+++ b/setup.py
@@ -10,7 +10,7 @@
 
 setup(
     name='imio.helpers',
-    version='1.0.0.dev0',
+    version='1.0.0rc1.dev0',
     description="Various helper methods for development.",
     long_description=long_description,
     # Get more from http://pypi.python.org/pypi?%3Aaction=list_classifiers