Bump Helm support matrix to v3.21.0 and v4.2.0

.github/copilot-instructions.md

@@ -7,7 +7,7 @@ Chartify is a Go library and CLI tool that converts Kubernetes resource YAMLs, K
 ## Working Effectively
 
 ### Bootstrap and Build
-- **Prerequisites**: Go 1.25.4+, Helm v4.1.0, Kustomize v5.8.0+ are required
+- **Prerequisites**: Go 1.26.0+, Helm v4.2.0, Kustomize v5.8.0+ are required
 - Build the CLI: `go build -o chartify ./cmd/chartify` -- takes 25 seconds. **NEVER CANCEL**. Set timeout to 60+ seconds.
 - Build dependencies: `go mod download` -- takes 15 seconds. **NEVER CANCEL**. Set timeout to 120+ seconds.
 - Alternative build with chart repo server: `go build -o chartreposerver ./cmd/chartreposerver`
@@ -72,7 +72,7 @@ Chartify is a Go library and CLI tool that converts Kubernetes resource YAMLs, K
 - The CLI expects exactly 2 positional arguments: RELEASE_NAME and CHART_PATH, with -o flag for output directory.
 
 ## CI/CD Integration
-- GitHub Actions run on Go 1.25.4+ with Helm v4.0.0 and Kustomize v5.8.0
+- GitHub Actions run on Go 1.26.0+ with Helm v4.2.0 and Kustomize v5.8.0
 - CI runs `CGO_ENABLED=0 go test ./...` after attempting to add helm stable repo
 - Linting workflow uses golangci-lint v2.1.6 but has configuration compatibility issues
 
@@ -102,4 +102,4 @@ testdata/             # Test charts and manifests
 - `patch.go` (208 lines): Strategic merge and JSON patch logic
 - `replace.go` (259 lines): Text replacement functionality
 - `requirements.go` (128 lines): Chart dependency management
-- `runner.go` (122 lines): Command execution utilities
+- `runner.go` (122 lines): Command execution utilities

.github/workflows/go.yml

@@ -11,8 +11,8 @@ jobs:
     strategy:
       matrix:
         helm-version:
-          - v3.20.2
-          - v4.1.4
+          - v3.21.0
+          - v4.2.0
     steps:
       - name: Check out code into the Go module directory
         uses: actions/checkout@v6

.github/workflows/lint.yaml

@@ -24,4 +24,5 @@ jobs:
       - name: Golangci lint
         uses: golangci/golangci-lint-action@v9
         with:
-          version: v2.6.2
+          version: v2.7.1
+          install-mode: goinstall

AGENTS.md

@@ -126,8 +126,8 @@ CGO_ENABLED=0 go test ./...
 ```
 
 ### Prerequisites
-- Go 1.25.4+
-- Helm v4.1.0 (helm command)
+- Go 1.26.0+
+- Helm v4.2.0 (helm command)
 - Kustomize v5.8.0+ (kustomize command)
 
 ### External Dependencies

README.md

@@ -36,8 +36,8 @@ go build -o chartreposerver ./cmd/chartreposerver
 
 ### Prerequisites
 
-- Go 1.25.4+
-- Helm v4.1.0 (helm command)
+- Go 1.26.0+
+- Helm v4.2.0 (helm command)
 - Kustomize v5.8.0+ (kustomize command, optional, for kustomize integration)
 
 ## CLI

go.mod

@@ -1,6 +1,6 @@
 module github.com/helmfile/chartify
 
-go 1.25.4
+go 1.26.0
 
 require (
 	github.com/Masterminds/semver/v3 v3.5.0
@@ -9,14 +9,14 @@ require (
 	github.com/otiai10/copy v1.14.1
 	github.com/stretchr/testify v1.11.1
 	gopkg.in/yaml.v3 v3.0.1
-	helm.sh/helm/v3 v3.20.2
-	helm.sh/helm/v4 v4.1.4
+	helm.sh/helm/v3 v3.21.0
+	helm.sh/helm/v4 v4.2.0
 )
 
 require (
 	github.com/Azure/go-ansiterm v0.0.0-20250102033503-faa5f7b0171c // indirect
 	github.com/MakeNowJust/heredoc v1.0.0 // indirect
-	github.com/ProtonMail/go-crypto v1.3.0 // indirect
+	github.com/ProtonMail/go-crypto v1.4.1 // indirect
 	github.com/blang/semver/v4 v4.0.0 // indirect
 	github.com/chai2010/gettext-go v1.0.2 // indirect
 	github.com/cloudflare/circl v1.6.3 // indirect
@@ -25,12 +25,12 @@ require (
 	github.com/containerd/log v0.1.0 // indirect
 	github.com/containerd/platforms v0.2.1 // indirect
 	github.com/dylibso/observe-sdk/go v0.0.0-20240819160327-2d926c5d788a // indirect
-	github.com/emicklei/go-restful/v3 v3.12.2 // indirect
+	github.com/emicklei/go-restful/v3 v3.13.0 // indirect
 	github.com/evanphx/json-patch v5.9.11+incompatible // indirect
 	github.com/evanphx/json-patch/v5 v5.9.11 // indirect
 	github.com/exponent-io/jsonpath v0.0.0-20210407135951-1de76d718b3f // indirect
 	github.com/extism/go-sdk v1.7.1 // indirect
-	github.com/fluxcd/cli-utils v0.37.2-flux.1 // indirect
+	github.com/fluxcd/cli-utils v1.2.0 // indirect
 	github.com/fxamacker/cbor/v2 v2.9.0 // indirect
 	github.com/go-errors/errors v1.5.1 // indirect
 	github.com/go-logr/logr v1.4.3 // indirect
@@ -49,7 +49,7 @@ require (
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
 	github.com/josharian/intern v1.0.0 // indirect
 	github.com/json-iterator/go v1.1.12 // indirect
-	github.com/klauspost/compress v1.18.0 // indirect
+	github.com/klauspost/compress v1.18.4 // indirect
 	github.com/liggitt/tabwriter v0.0.0-20181228230101-89fcab3d43de // indirect
 	github.com/mailru/easyjson v0.9.0 // indirect
 	github.com/mitchellh/go-wordwrap v1.0.1 // indirect
@@ -65,45 +65,45 @@ require (
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
 	github.com/russross/blackfriday/v2 v2.1.0 // indirect
-	github.com/sirupsen/logrus v1.9.3 // indirect
+	github.com/sirupsen/logrus v1.9.4 // indirect
 	github.com/spf13/cobra v1.10.2 // indirect
 	github.com/spf13/pflag v1.0.10 // indirect
 	github.com/tetratelabs/wabin v0.0.0-20230304001439-f6f874872834 // indirect
 	github.com/tetratelabs/wazero v1.11.0 // indirect
 	github.com/x448/float16 v0.8.4 // indirect
 	github.com/xlab/treeprint v1.2.0 // indirect
-	go.opentelemetry.io/proto/otlp v1.9.0 // indirect
-	go.yaml.in/yaml/v2 v2.4.3 // indirect
+	go.opentelemetry.io/proto/otlp v1.10.0 // indirect
+	go.yaml.in/yaml/v2 v2.4.4 // indirect
 	go.yaml.in/yaml/v3 v3.0.4 // indirect
-	golang.org/x/crypto v0.47.0 // indirect
-	golang.org/x/net v0.49.0 // indirect
-	golang.org/x/oauth2 v0.34.0 // indirect
-	golang.org/x/sync v0.19.0 // indirect
-	golang.org/x/sys v0.40.0 // indirect
-	golang.org/x/term v0.39.0 // indirect
-	golang.org/x/text v0.33.0 // indirect
-	golang.org/x/time v0.12.0 // indirect
-	google.golang.org/genproto/googleapis/rpc v0.0.0-20260128011058-8636f8732409 // indirect
-	google.golang.org/grpc v1.79.3 // indirect
-	google.golang.org/protobuf v1.36.11 // indirect
+	golang.org/x/crypto v0.50.0 // indirect
+	golang.org/x/net v0.52.0 // indirect
+	golang.org/x/oauth2 v0.36.0 // indirect
+	golang.org/x/sync v0.20.0 // indirect
+	golang.org/x/sys v0.43.0 // indirect
+	golang.org/x/term v0.42.0 // indirect
+	golang.org/x/text v0.36.0 // indirect
+	golang.org/x/time v0.15.0 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20260406210006-6f92a3bedf2d // indirect
+	google.golang.org/grpc v1.80.0 // indirect
+	google.golang.org/protobuf v1.36.12-0.20260120151049-f2248ac996af // indirect
 	gopkg.in/evanphx/json-patch.v4 v4.13.0 // indirect
 	gopkg.in/inf.v0 v0.9.1 // indirect
-	k8s.io/api v0.35.1 // indirect
-	k8s.io/apiextensions-apiserver v0.35.1 // indirect
-	k8s.io/apimachinery v0.35.1 // indirect
-	k8s.io/cli-runtime v0.35.1 // indirect
-	k8s.io/client-go v0.35.1 // indirect
-	k8s.io/component-base v0.35.1 // indirect
-	k8s.io/klog/v2 v2.130.1 // indirect
-	k8s.io/kube-openapi v0.0.0-20250910181357-589584f1c912 // indirect
-	k8s.io/kubectl v0.35.1 // indirect
-	k8s.io/utils v0.0.0-20251002143259-bc988d571ff4 // indirect
+	k8s.io/api v0.36.0 // indirect
+	k8s.io/apiextensions-apiserver v0.36.0 // indirect
+	k8s.io/apimachinery v0.36.0 // indirect
+	k8s.io/cli-runtime v0.36.0 // indirect
+	k8s.io/client-go v0.36.0 // indirect
+	k8s.io/component-base v0.36.0 // indirect
+	k8s.io/klog/v2 v2.140.0 // indirect
+	k8s.io/kube-openapi v0.0.0-20260317180543-43fb72c5454a // indirect
+	k8s.io/kubectl v0.36.0 // indirect
+	k8s.io/utils v0.0.0-20260210185600-b8788abfbbc2 // indirect
 	oras.land/oras-go/v2 v2.6.0 // indirect
-	sigs.k8s.io/controller-runtime v0.23.1 // indirect
+	sigs.k8s.io/controller-runtime v0.24.0 // indirect
 	sigs.k8s.io/json v0.0.0-20250730193827-2d320260d730 // indirect
 	sigs.k8s.io/kustomize/api v0.21.1 // indirect
 	sigs.k8s.io/kustomize/kyaml v0.21.1 // indirect
 	sigs.k8s.io/randfill v1.0.0 // indirect
-	sigs.k8s.io/structured-merge-diff/v6 v6.3.2-0.20260122202528-d9cc6641c482 // indirect
+	sigs.k8s.io/structured-merge-diff/v6 v6.3.2 // indirect
 	sigs.k8s.io/yaml v1.6.0 // indirect
 )