diff --git a/README.md b/README.md
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--- /dev/null
+++ b/README.md
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+Related Github issue: https://github.com/helmfile/helmfile/issues/743
+
+When using a kustomization, `helmfile template` fails with `Error: unknown flag: --load_restrictor]`
+Downgrading `kustomize` to i.e. `4.5.6` fixed it.
+
+Steps to reproduce:
+
+* Install Kustomize >= 5
+
+Then:
+
+    https://github.com/hinricht/helmfile-kustomize5.git
+    cd helmfile-kustomize5
+    helmfile template
+
+With Kustomize>=5 this error will show:
+
+```
+$ helmfile template
+in ./helmfile.yaml: [exit status 1
+
+COMMAND:
+  kustomize -o /tmp/chartify559297089/test/monitoring/test/templates/kustomized.yaml build --load_restrictor=none --enable_alpha_plugins /tmp/chartify559297089/test/monitoring/test
+
+OUTPUT:
+  Error: unknown flag: --load_restrictor]
+```
+
+With Kustomize <5 `helmfile template` works as expected.
diff --git a/helmfile.yaml b/helmfile.yaml
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+++ b/helmfile.yaml
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+helmDefaults:
+  kubeContext: "test"
+
+releases:
+  - name: test
+    namespace: monitoring
+    chart: ./test
diff --git a/test/kustomization.yaml b/test/kustomization.yaml
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--- /dev/null
+++ b/test/kustomization.yaml
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+resources:
+- test.yaml
diff --git a/test/test.yaml b/test/test.yaml
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+++ b/test/test.yaml
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+apiVersion: v1
+kind: Namespace
+metadata:
+  name: monitoring