diff --git a/setup.cfg b/setup.cfg
index 4204613c..118bf043 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,6 +1,6 @@
 [metadata]
 name = foolbox
-version = 0.3.6
+version = 0.4.0
 url = https://github.com/bethgelab/foolbox
 license = MIT
 author = Jonas Rauber & Wieland Brendel