diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index e2d72a2f0529a8dc9d3be78238bfb7f752b53ea6..910d7fecdb5c2164811701b8e101582c8278c9f4 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -138,12 +138,12 @@ test-package-source-builder:
     - test "$(pristine-lfs list | wc -l)" = 2
     - cd ..
     - git clone https://gitlab.apertis.org/infrastructure/test-data/fixture-dash-unmodified
-    - ": Verify we correctly detect when there are no local changes and use the co0 suffix"
+    - ": Verify we correctly detect when there are no local changes and use the apertis0 suffix"
     - cd fixture-dash-unmodified
     - apertis-pkg-merge-updates --package dash --upstream debian/buster --downstream apertis/v2020dev0
     - git log --graph --oneline --decorate
     - git diff debian/buster..
-    - test "$(dpkg-parsechangelog -SVersion)" = 0.5.10.2-5co0
+    - test "$(dpkg-parsechangelog -SVersion)" = 0.5.10.2-5apertis0
     - test "$(dpkg-parsechangelog -SDistribution)" = apertis
     - cd ..
     - rm -rf fixture-dash-unmodified
@@ -162,7 +162,7 @@ test-package-source-builder:
     - apertis-pkg-merge-updates --package dash --upstream debian/buster --downstream apertis/v2020dev0
     - git log --graph --oneline --decorate
     - git diff debian/buster..
-    - test "$(dpkg-parsechangelog -SVersion)" = 0.5.10.2-5co1
+    - test "$(dpkg-parsechangelog -SVersion)" = 0.5.10.2-5apertis1
     - test "$(dpkg-parsechangelog -SDistribution)" = UNRELEASED
     - cd ..
 
diff --git a/package-source-builder/overlay/usr/bin/apertis-pkg-merge-updates b/package-source-builder/overlay/usr/bin/apertis-pkg-merge-updates
index 11302f687837a0fb0b7c188972194443d49e5568..dad4f9bd7cd86c52a57905980b7fffa96e287f8f 100755
--- a/package-source-builder/overlay/usr/bin/apertis-pkg-merge-updates
+++ b/package-source-builder/overlay/usr/bin/apertis-pkg-merge-updates
@@ -94,7 +94,7 @@ def main():
   parser.add_argument('--package', dest='package', type=str, help='the package name (e.g. glib2.0)') # TODO: figure this out from the repo
   parser.add_argument('--downstream', dest='downstream', type=str, help='the downstream branch (e.g. apertis/v2020dev0)')
   parser.add_argument('--upstream', dest='upstream', type=str, required=True, help='the upstream branch (e.g. debian/buster)')
-  parser.add_argument('--local-version-suffix', dest="local_suffix", type=str, default="co", help='the local version suffix to be used in the new changelog entry')
+  parser.add_argument('--local-version-suffix', dest="local_suffix", type=str, default="apertis", help='the local version suffix to be used in the new changelog entry')
   args = parser.parse_args()
   package_name = args.package
 
diff --git a/package-source-builder/overlay/usr/bin/apertis-pkg-merge-upstream-to-downstreams b/package-source-builder/overlay/usr/bin/apertis-pkg-merge-upstream-to-downstreams
index 8d7ade889d8817b49a0bd2c0aa5bbec318c9178c..29eef00932629fad344a7833220258c59089d0d7 100755
--- a/package-source-builder/overlay/usr/bin/apertis-pkg-merge-upstream-to-downstreams
+++ b/package-source-builder/overlay/usr/bin/apertis-pkg-merge-upstream-to-downstreams
@@ -67,7 +67,7 @@ def main():
                       required=True, help='the upstream branch (e.g. debian/buster)')
   parser.add_argument('--downstreams', dest='downstreams', type=str,
                       required=True, help='downstream branches, colon seperate (e.g.  apertis/v2020dev0:apertis/v2019)')
-  parser.add_argument('--local-version-suffix', dest="local_suffix", type=str, default="co", help='the local version suffix to be used in new changelog entries')
+  parser.add_argument('--local-version-suffix', dest="local_suffix", type=str, default="apertis", help='the local version suffix to be used in new changelog entries')
   parser.add_argument('project_url', type=str, help='git project url to push updates to')
   args = parser.parse_args()