diff --git a/Dockerfile b/Dockerfile
index f01927f..3033650 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -29,6 +29,8 @@ ENV KUBECONFORM_VERSION="${KUBECONFORM_VERSION:-v0.5.0}"
 ENV CALICO_VERSION="${CALICO_VERSION:-v3.25.0}"
 # renovate: datasource=github-releases depName=fluxcd/flux2
 ENV FLUXCD_VERSION="${FLUXCD_VERSION:-v0.38.3}"
+# renovate: datasource=github-releases depName=cert-manager/cert-manager
+ENV CERTMANAGER_VERSION="${CERTMANAGER_VERSION:-v1.11.0}"
 
 RUN apk --update add curl tar bash python3 py3-yaml && \
     curl -SsfL -o /usr/local/bin/kubectl "https://dl.k8s.io/release/${KUBECTL_VERSION}/bin/linux/amd64/kubectl" && \
@@ -50,12 +52,16 @@ RUN apk --update add curl tar bash python3 py3-yaml && \
     chmod 755 /usr/local/bin/openapi2jsonschema && \
     mkdir -p /etc/kube-tools/schemas/flux/master-standalone-strict && \
     mkdir -p /etc/kube-tools/schemas/calico/master-standalone-strict && \
+    mkdir -p /etc/kube-tools/schemas/cert-manager/master-standalone-strict && \
     curl -SsfL "https://github.com/fluxcd/flux2/releases/download/${FLUXCD_VERSION}/crd-schemas.tar.gz" \
         | tar xz -C /etc/kube-tools/schemas/flux/master-standalone-strict && \
     curl -SsfL -o /tmp/calico.crds.yaml "https://raw.githubusercontent.com/projectcalico/calico/${CALICO_VERSION}/manifests/calico.yaml" && \
     cd /etc/kube-tools/schemas/calico/master-standalone-strict && \
     openapi2jsonschema /tmp/calico.crds.yaml && \
     for file in *.json ; do mv $file ${file//_v1/_v3} ; done && \
+    curl -SsfL -o /tmp/cert-manager.crds.yaml "https://github.com/cert-manager/cert-manager/releases/download/${CERTMANAGER_VERSION}/cert-manager.crds.yaml" && \
+    cd /etc/kube-tools/schemas/cert-manager/master-standalone-strict && \
+    openapi2jsonschema /tmp/cert-manager.crds.yaml && \
     rm -rf /var/cache/apk/* && \
     rm -rf /tmp/*
 
diff --git a/overlay/usr/local/bin/flux-validate b/overlay/usr/local/bin/flux-validate
index 2da3520..324b18f 100755
--- a/overlay/usr/local/bin/flux-validate
+++ b/overlay/usr/local/bin/flux-validate
@@ -40,6 +40,7 @@ kubeconform_config=(
     "-schema-location" "default"
     "-schema-location" "/etc/kube-tools/schemas/flux"
     "-schema-location" "/etc/kube-tools/schemas/calico/master-standalone-strict/{{ .ResourceKind }}_{{ .ResourceAPIVersion }}.json"
+    "-schema-location" "/etc/kube-tools/schemas/cert-manager/master-standalone-strict/{{ .ResourceKind }}_{{ .ResourceAPIVersion }}.json"
     "-exit-on-error"
     "-summary"
     "-skip" "Secret,CustomResourceDefinition"
diff --git a/renovate.json b/renovate.json
index 5f0540d..980cc63 100644
--- a/renovate.json
+++ b/renovate.json
@@ -7,7 +7,11 @@
       "extractVersion": "^kustomize\\/(?<version>v\\d+\\.\\d+\\.\\d+)$"
     },
     {
-      "matchPackageNames": ["fluxcd/flux2", "projectcalico/calico"],
+      "matchPackageNames": [
+        "fluxcd/flux2",
+        "projectcalico/calico",
+        "cert-manager/cert-manager"
+      ],
       "automerge": true
     },
     {