diff --git a/.version b/.version
index 8f0916f..53978e5 100644
--- a/.version
+++ b/.version
@@ -1 +1 @@
-0.5.0
+0.5.1-dev
diff --git a/changelog.md b/changelog.md
index c25aaec..5c6d60a 100644
--- a/changelog.md
+++ b/changelog.md
@@ -1,3 +1,5 @@
+up to 0.5.0
+
 # Changes in version 0.5.0