diff --git a/CHANGELOG.md b/CHANGELOG.md
index cfbc0fab..dfa89c3b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,12 @@
 Changelog for Analysis-Driver
 =============================
 
+0.27 (unreleased)
+-----------------
+
+- Nothing changed yet.
+
+
 0.26.1 (2019-11-18)
 -------------------
 
diff --git a/version.txt b/version.txt
index 30f6cf8d..4feda6fa 100644
--- a/version.txt
+++ b/version.txt
@@ -1 +1 @@
-0.26.1
+0.27.dev0