diff --git a/clusters/base/infra/longhorn/longhorn-system/helmrelease.yaml b/clusters/base/infra/longhorn/longhorn-system/helmrelease.yaml
index 7c459ed..23f0659 100644
--- a/clusters/base/infra/longhorn/longhorn-system/helmrelease.yaml
+++ b/clusters/base/infra/longhorn/longhorn-system/helmrelease.yaml
@@ -24,6 +24,28 @@ spec:
   upgrade:
     remediation:
       retries: 3
+  postRenderers:
+    - kustomize:
+        patches:
+          - target:
+              kind: DaemonSet
+              name: longhorn-manager
+            # chart hardcodes readinessProbe without timeoutSeconds, so it falls back to the
+            # k8s default of 1s; under CPU contention (e.g. busy nodes) that's too tight and
+            # causes spurious "Readiness probe failed ... Client.Timeout exceeded" flapping
+            patch: |
+              apiVersion: apps/v1
+              kind: DaemonSet
+              metadata:
+                name: longhorn-manager
+              spec:
+                template:
+                  spec:
+                    containers:
+                    - name: longhorn-manager
+                      readinessProbe:
+                        timeoutSeconds: 5
+                        failureThreshold: 5
   values:
     defaultSettings:
       defaultReplicaCount: 3            # по числу нод control-plane