diff --git a/.github/actions/deploy-keptn-on-cluster/action.yml b/.github/actions/deploy-keptn-on-cluster/action.yml
index 918e59fa9b..90c8a584d8 100644
--- a/.github/actions/deploy-keptn-on-cluster/action.yml
+++ b/.github/actions/deploy-keptn-on-cluster/action.yml
@@ -64,7 +64,7 @@ runs:
       if: inputs.cert-manager-io-enabled == 'cert_manager_io_on'
       env:
         # renovate: datasource=github-releases depName=cert-manager/cert-manager
-        CERT_MANAGER_IO_VERSION: "v1.15.2"
+        CERT_MANAGER_IO_VERSION: "v1.15.3"
       shell: bash
       run: |
         kubectl apply -f https://github.com/cert-manager/cert-manager/releases/download/$CERT_MANAGER_IO_VERSION/cert-manager.yaml