diff --git a/.qube.yml b/.qube.yml
index 600dc22ff..3af1e6cba 100644
--- a/.qube.yml
+++ b/.qube.yml
@@ -4,7 +4,7 @@ email: sven.fillinger@qbic.uni-tuebingen.de
 project_name: data-model-lib
 project_short_description: "Data models. A collection of QBiC's central data models\
   \ and DTOs. "
-version: 2.6.0
+version: 2.6.1
 domain: lib
 language: groovy
 project_slug: data-model-lib
diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 608581fbe..ab647688f 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -5,6 +5,20 @@ Changelog
 This project adheres to `Semantic Versioning <https://semver.org/>`_.
 
 
+2.6.1 (2021-05-12)
+------------------
+
+**Added**
+
+**Fixed**
+
+* add missing leading slash to toString() method in ``life/qbic/datamodel/dtos/projectmanagement/ProjectIdentifier.groovy`` (`#207 <https://github.com/qbicsoftware/data-model-lib/pull/207>`_)
+
+**Dependencies**
+
+**Deprecated**
+
+
 2.6.0 (2021-05-10)
 ------------------
 
diff --git a/docs/conf.py b/docs/conf.py
index 417c56a8e..99361394b 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -55,9 +55,9 @@
 # the built documents.
 #
 # The short X.Y version.
-version = '2.6.0'
+version = '2.6.1'
 # The full version, including alpha/beta/rc tags.
-release = '2.6.0'
+release = '2.6.1'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/pom.xml b/pom.xml
index 8c4c2f6f3..bab589c43 100644
--- a/pom.xml
+++ b/pom.xml
@@ -7,7 +7,7 @@
 
     <groupId>life.qbic</groupId>
 	<artifactId>data-model-lib</artifactId>
-	<version>2.6.0</version> <!-- <<QUBE_FORCE_BUMP>> -->
+	<version>2.6.1</version> <!-- <<QUBE_FORCE_BUMP>> -->
 	<name>data-model-lib</name>
 	<url>http://github.com/qbicsoftware/data-model-lib</url>
 	<description>Data models. A collection of QBiC's central data models and DTOs. </description>
diff --git a/qube.cfg b/qube.cfg
index fa8d6808f..7299f47ec 100644
--- a/qube.cfg
+++ b/qube.cfg
@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 2.6.0
+current_version = 2.6.1
 
 [bumpversion_files_whitelisted]
 dot_qube = .qube.yml
diff --git a/src/main/groovy/life/qbic/datamodel/dtos/projectmanagement/ProjectIdentifier.groovy b/src/main/groovy/life/qbic/datamodel/dtos/projectmanagement/ProjectIdentifier.groovy
index 25333d09e..faf45bd9f 100644
--- a/src/main/groovy/life/qbic/datamodel/dtos/projectmanagement/ProjectIdentifier.groovy
+++ b/src/main/groovy/life/qbic/datamodel/dtos/projectmanagement/ProjectIdentifier.groovy
@@ -31,6 +31,6 @@ class ProjectIdentifier {
 
     @Override
     String toString() {
-        return "${projectSpace.toString()}/${projectCode.toString()}"
+        return "/${projectSpace.toString()}/${projectCode.toString()}"
     }
 }