diff --git a/qt-creator.spec b/qt-creator.spec
index e409f35..58257cf 100644
--- a/qt-creator.spec
+++ b/qt-creator.spec
@@ -1,14 +1,16 @@
 %define majver %(echo %version | cut -d. -f1-2)
+%define pkgver %(echo %version | tr _ -)
 Name:          qt-creator
-Version:       4.11.1
-Release:       3mamba
+Version:       4.12.0_rc1
+Release:       1mamba
 Summary:       An integrated development environment (IDE) tailored to the needs of Qt developers
 Group:         Development/Tools
 Vendor:        openmamba
 Distribution:  openmamba
 Packager:      Stefano Cotta Ramusino <stefano.cotta@openmamba.org>
 URL:           http://qt.digia.com/Product/Developer-Tools/
-Source:        http://download.qt.io/official_releases/qtcreator/%{majver}/%{version}/qt-creator-opensource-src-%{version}.tar.xz
+Source:        http://download.qt.io/development_releases/qtcreator/4.12/4.12.0-rc1/qt-creator-opensource-src-%{pkgver}.tar.xz
+#Source:        http://download.qt.io/official_releases/qtcreator/%{majver}/%{version}/qt-creator-opensource-src-%{version}.tar.xz
 Source1:       qtcreator.desktop
 Source2:       qtcreator-wrapper
 Patch0:        qt-creator-4.11.1-enable-it-es-translations.patch
@@ -42,7 +44,7 @@ It includes:
 #% debug_package
 
 %prep
-%setup -q -n %{name}-opensource-src-%{version}
+%setup -q -n %{name}-opensource-src-%{pkgver}
 %patch0 -p1
 
 %build
@@ -107,6 +109,9 @@ done
 %doc LICENSE.GPL3-EXCEPT
 
 %changelog
+* Wed Apr 08 2020 Silvan Calarco <silvan.calarco@mambasoft.it> 4.12.0_rc1-1mamba
+- update to 4.12.0_rc1
+
 * Tue Mar 31 2020 Silvan Calarco <silvan.calarco@mambasoft.it> 4.11.1-3mamba
 - translatons patch fixed