diff --git a/.drone.yml b/.drone.yml
index 127d859..ca90aaa 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -5,32 +5,32 @@ name: build
 
 steps:
   - name: lint
-    image: golangci/golangci-lint:v1.43.0
+    image: code.pztrn.name/containers/mirror/golangci/golangci-lint:v1.46.2
     environment:
       CGO_ENABLED: 0
     commands:
       - golangci-lint run
 
   - name: test
-    image: golang:1.17.3-alpine
+    image: code.pztrn.name/containers/mirror/golang:1.18.3-alpine
     environment:
       CGO_ENABLED: 0
     commands:
       - go test -test.v ./...
 
   - name: test-race
-    image: golang:1.17.3-stretch
+    image: code.pztrn.name/containers/mirror/golang:1.18.3-bullseye
     commands:
       - go test -race -test.v ./...
 
   - name: benchmark
-    image: golang:1.17.3-alpine
+    image: code.pztrn.name/containers/mirror/golang:1.18.3-alpine
     environment:
       CGO_ENABLED: 0
     commands:
       - go test -benchmem -run=^$ go.dev.pztrn.name/valiwork -bench .
 
   - name: benchmark-race
-    image: golang:1.17.3-stretch
+    image: code.pztrn.name/containers/mirror/golang:1.18.3-bullseye
     commands:
       - go test -benchmem -run=^$ go.dev.pztrn.name/valiwork -race -bench .
diff --git a/debug.go b/debug.go
index 7ad1249..e6cc604 100644
--- a/debug.go
+++ b/debug.go
@@ -23,14 +23,11 @@
 package valiwork
 
 import (
-	// stdlib
 	"os"
 	"strconv"
 )
 
-var (
-	DEBUG bool
-)
+var DEBUG bool
 
 // Initializes debug output.
 // nolint
diff --git a/errors.go b/errors.go
index ca9dff9..7ff8af6 100644
--- a/errors.go
+++ b/errors.go
@@ -23,7 +23,6 @@
 package valiwork
 
 import (
-	// stdlib
 	"errors"
 )
 
diff --git a/example/main.go b/example/main.go
index cff3cb8..60bf8c8 100644
--- a/example/main.go
+++ b/example/main.go
@@ -23,12 +23,10 @@
 package main
 
 import (
-	"strings"
-	// stdlib
 	"errors"
 	"log"
+	"strings"
 
-	// other
 	"go.dev.pztrn.name/valiwork"
 )
 
@@ -40,7 +38,7 @@ func main() {
 	log.Println("Starting validation example...")
 	log.Println("WARN: to see additional valiwork output define 'VALIWORK_DEBUG' environment variable and set it to 'true'!")
 
-	//stringToValidate := " I am pretty b@d $tring"
+	// stringToValidate := " I am pretty b@d $tring"
 
 	_ = valiwork.RegisterValidator(stringValidatorName, stringValidator)
 }
@@ -51,6 +49,7 @@ func stringValidator(thing interface{}, optional ...interface{}) []interface{} {
 	stringToValidate, ok := thing.(string)
 	if !ok {
 		errs = append(errs, errors.New("passed value is not a string"))
+
 		return errs
 	}
 
diff --git a/validations.go b/validations.go
index 192041d..0e4aa7c 100644
--- a/validations.go
+++ b/validations.go
@@ -23,16 +23,12 @@
 package valiwork
 
 import (
-	// stdlib
 	"log"
 
-	// local
 	"go.dev.pztrn.name/valiwork/validators"
 )
 
-var (
-	registeredValidators map[string]validators.ValidatorFunc
-)
+var registeredValidators map[string]validators.ValidatorFunc
 
 // nolint
 func init() {
@@ -74,6 +70,7 @@ func Validate(thing interface{}, validatorName string, optional ...interface{})
 
 	if !found {
 		errs = append(errs, ErrValidatorNotRegistered)
+
 		return errs
 	}
 
diff --git a/validations_test.go b/validations_test.go
index 52c7c7a..f8cadd8 100644
--- a/validations_test.go
+++ b/validations_test.go
@@ -23,30 +23,27 @@
 package valiwork
 
 import (
-	// stdlib
 	"errors"
 	"strconv"
 	"strings"
 	"sync"
 	"testing"
 
-	// local
-	"go.dev.pztrn.name/valiwork/validators"
-
-	// other
 	"github.com/stretchr/testify/require"
+	"go.dev.pztrn.name/valiwork/validators"
 )
 
 const (
 	testString = " I am test $tring"
 )
 
+// nolint:paralleltest
 func TestRegisterValidator(t *testing.T) {
 	initializeValidatorsStorage()
 
 	testCases := []struct {
-		ValidatorName string
 		ValidatorFunc validators.ValidatorFunc
+		ValidatorName string
 		ShouldFail    bool
 	}{
 		{
@@ -92,10 +89,10 @@ func BenchmarkRegisterValidator(b *testing.B) {
 func BenchmarkRegisterValidatorAsync(b *testing.B) {
 	initializeValidatorsStorage()
 
-	var w sync.WaitGroup
+	var waiter sync.WaitGroup
 
 	for i := 0; i < b.N; i++ {
-		w.Add(1)
+		waiter.Add(1)
 
 		go func() {
 			_ = RegisterValidator("string_test_validator_"+strconv.Itoa(i),
@@ -104,13 +101,14 @@ func BenchmarkRegisterValidatorAsync(b *testing.B) {
 				},
 			)
 
-			w.Done()
+			waiter.Done()
 		}()
 
-		w.Wait()
+		waiter.Wait()
 	}
 }
 
+// nolint:paralleltest
 func TestValidate(t *testing.T) {
 	initializeValidatorsStorage()
 
@@ -120,6 +118,7 @@ func TestValidate(t *testing.T) {
 		stringToValidate, ok := thing.(string)
 		if !ok {
 			errs = append(errs, errors.New("not a string"))
+
 			return errs
 		}
 
@@ -146,6 +145,7 @@ func BenchmarkValidate(b *testing.B) {
 		stringToValidate, ok := thing.(string)
 		if !ok {
 			errs = append(errs, errors.New("not a string"))
+
 			return errs
 		}
 
@@ -178,6 +178,7 @@ func BenchmarkValidateAsync(b *testing.B) {
 		stringToValidate, ok := thing.(string)
 		if !ok {
 			errs = append(errs, errors.New("not a string"))
+
 			return errs
 		}
 
@@ -194,21 +195,22 @@ func BenchmarkValidateAsync(b *testing.B) {
 
 	b.StartTimer()
 
-	var w sync.WaitGroup
+	var waiter sync.WaitGroup
 
 	for i := 0; i < b.N; i++ {
-		w.Add(1)
+		waiter.Add(1)
 
 		go func() {
 			_ = Validate(testString, "string_test1")
 
-			w.Done()
+			waiter.Done()
 		}()
 
-		w.Wait()
+		waiter.Wait()
 	}
 }
 
+// nolint:paralleltest
 func TestValidateMany(t *testing.T) {
 	initializeValidatorsStorage()
 
@@ -218,6 +220,7 @@ func TestValidateMany(t *testing.T) {
 		stringToValidate, ok := thing.(string)
 		if !ok {
 			errs = append(errs, errors.New("not a string"))
+
 			return errs
 		}
 
@@ -234,6 +237,7 @@ func TestValidateMany(t *testing.T) {
 		stringToValidate, ok := thing.(string)
 		if !ok {
 			errs = append(errs, errors.New("not a string"))
+
 			return errs
 		}
 
@@ -260,6 +264,7 @@ func BenchmarkValidateMany(b *testing.B) {
 		stringToValidate, ok := thing.(string)
 		if !ok {
 			errs = append(errs, errors.New("not a string"))
+
 			return errs
 		}
 
@@ -276,6 +281,7 @@ func BenchmarkValidateMany(b *testing.B) {
 		stringToValidate, ok := thing.(string)
 		if !ok {
 			errs = append(errs, errors.New("not a string"))
+
 			return errs
 		}
 
@@ -304,6 +310,7 @@ func BenchmarkValidateManyAsync(b *testing.B) {
 		stringToValidate, ok := thing.(string)
 		if !ok {
 			errs = append(errs, errors.New("not a string"))
+
 			return errs
 		}
 
@@ -320,6 +327,7 @@ func BenchmarkValidateManyAsync(b *testing.B) {
 		stringToValidate, ok := thing.(string)
 		if !ok {
 			errs = append(errs, errors.New("not a string"))
+
 			return errs
 		}
 
@@ -332,27 +340,28 @@ func BenchmarkValidateManyAsync(b *testing.B) {
 
 	b.StartTimer()
 
-	var w sync.WaitGroup
+	var waiter sync.WaitGroup
 
 	for i := 0; i < b.N; i++ {
-		w.Add(1)
+		waiter.Add(1)
 
 		go func() {
 			_ = ValidateMany(testString, []string{"string_test1", "string_test2"}, nil)
 
-			w.Done()
+			waiter.Done()
 		}()
 
-		w.Wait()
+		waiter.Wait()
 	}
 }
 
+// nolint:paralleltest
 func TestUnregisterValidator(t *testing.T) {
 	initializeValidatorsStorage()
 
 	testCases := []struct {
-		ValidatorName string
 		ValidatorFunc validators.ValidatorFunc
+		ValidatorName string
 	}{
 		{
 			ValidatorName: "string_test_validator",
@@ -371,6 +380,7 @@ func TestUnregisterValidator(t *testing.T) {
 	}
 }
 
+// nolint:paralleltest
 func TestUnregisterValidatorNotRegisteredValidator(t *testing.T) {
 	initializeValidatorsStorage()
 
@@ -411,19 +421,19 @@ func BenchmarkUnregisterValidatorAsync(b *testing.B) {
 		)
 	}
 
-	var w sync.WaitGroup
+	var waiter sync.WaitGroup
 
 	b.StartTimer()
 
 	for i := 0; i < b.N; i++ {
-		w.Add(1)
+		waiter.Add(1)
 
 		go func() {
 			_ = UnregisterValidator("string_test_validator_" + strconv.Itoa(i))
 
-			w.Done()
+			waiter.Done()
 		}()
 
-		w.Wait()
+		waiter.Wait()
 	}
 }