diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 53e2bfb4..531e464b 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -56,11 +56,12 @@ build-chart:
 
     if $PUSH_CHART; then
       helm registry login registry.cern.ch -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD
-      helm push ${CHART_NAME}-${CI_COMMIT_TAG}.tgz "oci://${REGISTRY_CHART_PATH}"
+      CHART_VERSION=${CI_COMMIT_TAG#v} # strip version prefix from chart.
+      helm push ${CHART_NAME}-${CHART_VERSION}.tgz "oci://${REGISTRY_CHART_PATH}"
 
       echo -n "${HARBOR_SIGNKEY}" | base64 -d > .sign.key
       cosign login registry.cern.ch -u ${HARBOR_USER} -p ${HARBOR_TOKEN}
-      cosign sign --key .sign.key -y "${REGISTRY_CHART_PATH}/${CHART_NAME}:${CI_COMMIT_TAG}"
+      cosign sign --key .sign.key -y "${REGISTRY_CHART_PATH}/${CHART_NAME}:${CHART_VERSION}"
     fi
   variables:
     REGISTRY_CHART_PATH: registry.cern.ch/kubernetes/charts