diff --git a/README.md b/README.md
index 22d9f41..34a81ee 100644
--- a/README.md
+++ b/README.md
@@ -1,8 +1,8 @@
 ctools information
 ==================
-* Version:             1.4.0 (7 June 2017)
+* Version:             1.5.0.dev1 (7 June 2017)
 * Author:              Juergen Knoedlseder (jurgen.knodlseder@irap.omp.eu)
-* GammaLib dependency: 1.4.0
+* GammaLib dependency: 1.5.0.dev1
 
 [![Build Status](https://cta-jenkins.irap.omp.eu/buildStatus/icon?job=ctools-integrate-os)](https://cta-jenkins.irap.omp.eu/job/ctools-integrate-os/)
 
diff --git a/configure.ac b/configure.ac
index 503ae94..ee4482d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -28,7 +28,7 @@
 #############################################################################
 # Initialisation                                                            #
 #############################################################################
-AC_INIT([ctools], [1.4.0], [jurgen.knodlseder@irap.omp.eu], [ctools])
+AC_INIT([ctools], [1.5.0.dev1], [jurgen.knodlseder@irap.omp.eu], [ctools])
 AC_CONFIG_SRCDIR([src/ctselect/ctselect.cpp])
 AC_CONFIG_MACRO_DIR([m4])
 #AM_INIT_AUTOMAKE([gnu no-dependencies foreign])
diff --git a/ctools.pc.in b/ctools.pc.in
index 2a285a3..1e72f2d 100644
--- a/ctools.pc.in
+++ b/ctools.pc.in
@@ -6,9 +6,9 @@ includedir=${prefix}/include
 Name: ctools
 Description: CTA science analysis tools
 URL: http://cta.irap.omp.eu/ctools
-Version: 1.4.0
+Version: 1.5.0.dev1
 Requires: 
-Requires.private: gammalib >= 1.4.0
+Requires.private: gammalib >= 1.5.0.dev1
 Conflicts: 
 Cflags: -I${includedir}/ctools @OPENMP_CXXFLAGS@
 Libs: -L${libdir} -lctools
diff --git a/doc/Doxyfile b/doc/Doxyfile
index 0704682..7b17858 100644
--- a/doc/Doxyfile
+++ b/doc/Doxyfile
@@ -32,7 +32,7 @@ PROJECT_NAME           = ctools
 # This could be handy for archiving the generated documentation or
 # if some version control system is used.
 
-PROJECT_NUMBER         = 1.4.0
+PROJECT_NUMBER         = 1.5.0.dev1
 
 # Using the PROJECT_BRIEF tag one can provide an optional one line description
 # for a project that appears at the top of each page and should give viewer
diff --git a/doc/source/conf.py b/doc/source/conf.py
index 40a8ae1..0f63551 100644
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -66,10 +66,10 @@ copyright = u'2014-2017, ctools developers'
 # built documents.
 #
 # The short X.Y version.
-version = '1.4'
+version = '1.5'
 
 # The full version, including alpha/beta/rc tags.
-release = '1.4.0'
+release = '1.5.0.dev1'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/sonar-project.properties b/sonar-project.properties
index 700ad2a..13d21e0 100644
--- a/sonar-project.properties
+++ b/sonar-project.properties
@@ -1,7 +1,7 @@
 # Required metadata
 sonar.projectKey=ctools
 sonar.projectName=ctools
-sonar.projectVersion=1.4.0
+sonar.projectVersion=1.5.0.dev1
 
 # Description
 sonar.projectDescription="Cherenkov Telescope Array Science Analysis Software"