diff --git a/.github/workflows/golang.yml b/.github/workflows/golang.yml
index eea3175..71c7911 100644
--- a/.github/workflows/golang.yml
+++ b/.github/workflows/golang.yml
@@ -9,7 +9,7 @@ jobs:
       - name: Setup Go for use with actions
         uses: actions/setup-go@v2
         with:
-          go-version: 1.15
+          go-version: 1.21
       - uses: actions/checkout@v2
       - uses: actions/cache@v2
         with:
diff --git a/.github/workflows/golangci.yml b/.github/workflows/golangci.yml
index ebfbe9a..717c287 100644
--- a/.github/workflows/golangci.yml
+++ b/.github/workflows/golangci.yml
@@ -10,4 +10,4 @@ jobs:
       - name: golangci-lint
         uses: golangci/golangci-lint-action@v2
         with:
-          version: v1.41.1
+          version: v1.54.2
diff --git a/.golangci.yml b/.golangci.yml
index 27ad51a..5f97dfc 100644
--- a/.golangci.yml
+++ b/.golangci.yml
@@ -18,80 +18,6 @@ linters-settings:
     extra-rules: true
 
 linters:
-  disable-all: true
-  enable:
-    - bodyclose
-    - deadcode
-    - depguard
-    - dogsled
-    - dupl
-    - errcheck
-    - gochecknoglobals
-    - gochecknoinits
-    - gocognit
-    - goconst
-    - gocritic
-    - gocyclo
-    - godot
-    - gofmt
-    - goimports
-    - gomnd
-    - gomodguard
-    - goprintffuncname
-    - gosec
-    - gosimple
-    - govet
-    - ineffassign
-    - lll
-    - misspell
-    - nakedret
-    - nestif
-    - prealloc
-    - rowserrcheck
-    - staticcheck
-    - structcheck
-    - stylecheck
-    - typecheck
-    - unconvert
-    - unparam
-    - unused
-    - varcheck
-    - whitespace
-    - wsl
-    - asciicheck
-    - godox
-    - nolintlint
-    - goerr113
-    - exhaustive
-    - exportloopref
-    - gofumpt
-    - goheader
-    - noctx
-    - sqlclosecheck
-    - nlreturn
-    - errorlint
-    - exhaustivestruct
-    - paralleltest
-    - tparallel
-    - wrapcheck
-    - forbidigo
-    - makezero
-    - predeclared
-    - thelper
-    - cyclop
-    - durationcheck
-    - forcetypeassert
-    - gci
-    - gomoddirectives
-    - importas
-    - nilerr
-    - promlinter
-    - revive
-    - tagliatelle
-    - testpackage
-    - wastedassign
-    - ifshort
-    # - interfacer # Deprecated
-    # - golint # Deprecated
-    # - maligned # Deprecated
-    # - scopelint # Deprecated
\ No newline at end of file
+  enable-all: true
+  disable:
+    - depguard
\ No newline at end of file
diff --git a/README.md b/README.md
index 6991f0c..bdbcfde 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,5 @@
 ![GolangCI](https://github.com/lawzava/go-postal/workflows/golangci/badge.svg?branch=main)
-[![Version](https://img.shields.io/badge/version-v1.1.1-green.svg)](https://github.com/lawzava/go-postal/releases)
+[![Version](https://img.shields.io/badge/version-v1.2.0-green.svg)](https://github.com/lawzava/go-postal/releases)
 [![Go Report Card](https://goreportcard.com/badge/github.com/lawzava/go-postal)](https://goreportcard.com/report/github.com/lawzava/go-postal)
 [![Coverage Status](https://coveralls.io/repos/github/lawzava/go-postal/badge.svg?branch=main)](https://coveralls.io/github/lawzava/go-postal?branch=main)
 [![Go Reference](https://pkg.go.dev/badge/github.com/lawzava/go-postal.svg)](https://pkg.go.dev/github.com/lawzava/go-postal)
diff --git a/go.mod b/go.mod
index 9a8b393..8e83b1b 100644
--- a/go.mod
+++ b/go.mod
@@ -1,10 +1,13 @@
 module github.com/lawzava/go-postal
 
-go 1.15
+go 1.21
+
+require github.com/stretchr/testify v1.7.0
 
 require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e // indirect
-	github.com/stretchr/testify v1.7.0
+	github.com/pmezard/go-difflib v1.0.0 // indirect
 	gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f // indirect
+	gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c // indirect
 )
diff --git a/states.go b/states.go
index 9d28bf5..6b7a065 100644
--- a/states.go
+++ b/states.go
@@ -184,7 +184,8 @@ func (s State) Is(state State) bool {
 }
 
 // Name returns full state name from state code.
-// nolint:gocyclo,cyclop // allow higher complexity
+//
+//nolint:gocyclo,cyclop,funlen // allow higher complexity
 func (s State) Name() StateName {
 	switch s {
 	case Alaska:
@@ -302,7 +303,7 @@ func FindState(postal string) (State, error) {
 		return "", fmt.Errorf("invalid code '%s': %w", postal, ErrInvalidCode)
 	}
 
-	code, err := strconv.ParseInt(postal, 10, 64) // nolint:gomnd // allow fixed integer size
+	code, err := strconv.ParseInt(postal, 10, 64)
 	if err != nil {
 		return "", fmt.Errorf("code is not a valid number: %w", ErrInvalidCode)
 	}
@@ -319,7 +320,7 @@ func FindState(postal string) (State, error) {
 	return state, nil
 }
 
-// nolint:gocyclo,gomnd,cyclop // allow higher complexity & zip codes as integers
+//nolint:gocyclo,gomnd,cyclop,funlen // allow higher complexity & zip codes as integers
 func getStateFromCode(code int64) State {
 	switch {
 	case rng(code, 99500, 99999):
diff --git a/validate.go b/validate.go
index f77146b..d2832f7 100644
--- a/validate.go
+++ b/validate.go
@@ -6,5 +6,5 @@ const codeChecker = "^\\d{5}(?:[-\\s]\\d{4})?$"
 
 // IsValid checks whether the supplied request is valid postal code.
 func IsValid(code string) bool {
-	return regexp.MustCompile(codeChecker).Match([]byte(code))
+	return regexp.MustCompile(codeChecker).MatchString(code)
 }