diff --git a/docs/user-guide/third-party-addons/opentelemetry.md b/docs/user-guide/third-party-addons/opentelemetry.md
index af7fd2b14..32b17d2ca 100644
--- a/docs/user-guide/third-party-addons/opentelemetry.md
+++ b/docs/user-guide/third-party-addons/opentelemetry.md
@@ -191,7 +191,7 @@ To install the example and collectors run:
     helm repo add grafana https://grafana.github.io/helm-charts
     helm repo update
     # deploy cert-manager needed for OpenTelemetry collector operator
-    kubectl apply -f https://github.com/cert-manager/cert-manager/releases/download/v1.9.1/cert-manager.yaml
+    kubectl apply -f https://github.com/cert-manager/cert-manager/releases/download/v1.15.3/cert-manager.yaml
     # create observability namespace
     kubectl apply -f https://raw.githubusercontent.com/esigo/nginx-example/main/observability/namespace.yaml
     # install OpenTelemetry collector operator
diff --git a/test/e2e/run-chart-test.sh b/test/e2e/run-chart-test.sh
index 95465ee32..d626a2b91 100755
--- a/test/e2e/run-chart-test.sh
+++ b/test/e2e/run-chart-test.sh
@@ -91,16 +91,18 @@ echo "[dev-env] copying docker images to cluster..."
 kind load docker-image --name="${KIND_CLUSTER_NAME}" --nodes=${KIND_WORKERS} ${REGISTRY}/controller:${TAG}
 
 if [ "${SKIP_CERT_MANAGER_CREATION:-false}" = "false" ]; then
-  curl -fsSL -o cmctl.tar.gz https://github.com/cert-manager/cert-manager/releases/download/v1.11.1/cmctl-linux-amd64.tar.gz
-  tar xzf cmctl.tar.gz
-  chmod +x cmctl
- ./cmctl help
-  echo "[dev-env] apply cert-manager ..."
-  kubectl apply --wait -f https://github.com/cert-manager/cert-manager/releases/download/v1.11.0/cert-manager.yaml
-  kubectl wait --timeout=30s --for=condition=available deployment/cert-manager -n cert-manager
-  kubectl get validatingwebhookconfigurations cert-manager-webhook -ojson | jq '.webhooks[].clientConfig'
-  kubectl get endpoints -n cert-manager cert-manager-webhook
-  ./cmctl check api --wait=2m
+  echo "[dev-env] deploying cert-manager..."
+
+  # Get OS & platform for downloading cmctl.
+  os="$(uname -o | tr "[:upper:]" "[:lower:]" | sed "s/gnu\///")"
+  platform="$(uname -m | sed "s/aarch64/arm64/;s/x86_64/amd64/")"
+
+  # Download cmctl. Cannot validate checksum as OS & platform may vary.
+  curl --fail --location "https://github.com/cert-manager/cmctl/releases/download/v2.1.1/cmctl_${os}_${platform}.tar.gz" | tar --extract --gzip cmctl
+
+  # Install cert-manager.
+  ./cmctl x install
+  ./cmctl check api --wait 1m
 fi
 
 echo "[dev-env] running helm chart e2e tests..."