diff --git a/jollyday-core/pom.xml b/jollyday-core/pom.xml
index cedbfa942..6300408a4 100644
--- a/jollyday-core/pom.xml
+++ b/jollyday-core/pom.xml
@@ -12,7 +12,7 @@
   <parent>
     <groupId>de.focus-shift</groupId>
     <artifactId>jollyday</artifactId>
-    <version>0.27.0</version>
+    <version>0.28.0-SNAPSHOT</version>
     <relativePath>../pom.xml</relativePath>
   </parent>
 
diff --git a/jollyday-jackson/pom.xml b/jollyday-jackson/pom.xml
index 6c294173a..11b8721e9 100644
--- a/jollyday-jackson/pom.xml
+++ b/jollyday-jackson/pom.xml
@@ -10,7 +10,7 @@
   <parent>
     <groupId>de.focus-shift</groupId>
     <artifactId>jollyday</artifactId>
-    <version>0.27.0</version>
+    <version>0.28.0-SNAPSHOT</version>
     <relativePath>../pom.xml</relativePath>
   </parent>
 
diff --git a/jollyday-jaxb/pom.xml b/jollyday-jaxb/pom.xml
index d65c7c49e..58edbf6ae 100644
--- a/jollyday-jaxb/pom.xml
+++ b/jollyday-jaxb/pom.xml
@@ -10,7 +10,7 @@
   <parent>
     <groupId>de.focus-shift</groupId>
     <artifactId>jollyday</artifactId>
-    <version>0.27.0</version>
+    <version>0.28.0-SNAPSHOT</version>
     <relativePath>../pom.xml</relativePath>
   </parent>
 
diff --git a/jollyday-tests/pom.xml b/jollyday-tests/pom.xml
index 185e54191..4aa7ee70a 100644
--- a/jollyday-tests/pom.xml
+++ b/jollyday-tests/pom.xml
@@ -8,7 +8,7 @@
   <parent>
     <groupId>de.focus-shift</groupId>
     <artifactId>jollyday</artifactId>
-    <version>0.27.0</version>
+    <version>0.28.0-SNAPSHOT</version>
     <relativePath>../pom.xml</relativePath>
   </parent>
 
diff --git a/pom.xml b/pom.xml
index 9a226dbe3..09731eb10 100644
--- a/pom.xml
+++ b/pom.xml
@@ -4,7 +4,7 @@
 
   <groupId>de.focus-shift</groupId>
   <artifactId>jollyday</artifactId>
-  <version>0.27.0</version>
+  <version>0.28.0-SNAPSHOT</version>
   <packaging>pom</packaging>
 
   <name>Jollyday</name>