diff --git a/.gitignore b/.gitignore
index b604c05..cdffad8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,3 +9,4 @@
 /osbuild-9.tar.gz
 /osbuild-10.tar.gz
 /osbuild-11.tar.gz
+/osbuild-12.tar.gz
diff --git a/osbuild.spec b/osbuild.spec
index f2f9f0d..5ed96f1 100644
--- a/osbuild.spec
+++ b/osbuild.spec
@@ -1,6 +1,6 @@
 %global         forgeurl https://github.com/osbuild/osbuild
 
-Version:        11
+Version:        12
 
 %forgemeta
 
@@ -33,7 +33,7 @@ Requires:       systemd
 Requires:       systemd-container
 Requires:       tar
 Requires:       util-linux
-Requires:       python3-%{pypi_name}
+Requires:       python3-%{pypi_name} = %{version}-%{release}
 
 # Turn off dependency generators for assemblers, runners and stages.
 # They run in a container, so there's no reason to generate dependencies
@@ -53,6 +53,16 @@ Summary:        %{summary}
 %description -n python3-%{pypi_name}
 A build system for OS images
 
+%package        ostree
+Summary:        OSTree support
+Requires:       %{name} = %{version}-%{release}
+Requires:       ostree
+Requires:       rpm-ostree
+
+%description ostree
+Contains the necessary stages, assembler and source
+to build OSTree based images.
+
 %prep
 %forgesetup
 
@@ -96,6 +106,11 @@ exit 0
 %{_mandir}/man1/%{name}.1*
 %{_mandir}/man5/%{name}-manifest.5*
 %{pkgdir}
+# the following files are in the ostree sub-package
+%exclude %{pkgdir}/assemblers/org.osbuild.ostree.commit
+%exclude %{pkgdir}/sources/org.osbuild.ostree
+%exclude %{pkgdir}/stages/org.osbuild.ostree
+%exclude %{pkgdir}/stages/org.osbuild.rpm-ostree
 
 %files -n       python3-%{pypi_name}
 %license LICENSE
@@ -103,7 +118,20 @@ exit 0
 %{python3_sitelib}/%{pypi_name}-*.egg-info/
 %{python3_sitelib}/%{pypi_name}/
 
+%files ostree
+%{pkgdir}/assemblers/org.osbuild.ostree.commit
+%{pkgdir}/sources/org.osbuild.ostree
+%{pkgdir}/stages/org.osbuild.ostree
+%{pkgdir}/stages/org.osbuild.rpm-ostree
+
 %changelog
+* Wed Apr 15 2020 Christian Kellner <ckellner@redhat.com> - 12-1
+- new upstream release 12
+- Specify the exact version in the 'python3-osbuild' requirement
+  to avoid the library and the main binary being out of sync.
+- osbuild-ostree sub-package with the necessary bits to create
+  OSTree based images
+
 * Thu Apr  2 2020 Christian Kellner <ckellner@redhat.com> - 11-1
 - new upstream release 11
 - Turn of dependency generator for internal components
diff --git a/sources b/sources
index 85d20a5..d951f8a 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (osbuild-11.tar.gz) = b58b2783ae525a65d5ce78faa62fda22ae912f7750e325b8916fa4e81a42e3eaaeb82a2a7c82665d5731aeb2b83344a950d47557220b4814f50eeb7f9f908ab4
+SHA512 (osbuild-12.tar.gz) = 9dc2a151ac337bd945cbaa2566f2789bc1d019d916c8a47b66bbd21f9e19f4c56276508fe6a7871bc52d40795078336ad4b56de3fd50f63222dd41303e11619d