diff --git a/setup.py b/setup.py
index <HASH>..<HASH> 100644
--- a/setup.py
+++ b/setup.py
@@ -6,7 +6,7 @@ def readme():
 
 configuration = {
     'name' : 'umap-learn',
-    'version': '0.4.0',
+    'version': '0.4.0.rc1',
     'description' : 'Uniform Manifold Approximation and Projection',
     'long_description' : readme(),
     'classifiers' : [
We have achieved release candidate status. Soon to merge to master.