diff --git a/rule/enforce_repeated_arg_type_style.go b/rule/enforce_repeated_arg_type_style.go
index d03db6b81..25f9cdf2d 100644
--- a/rule/enforce_repeated_arg_type_style.go
+++ b/rule/enforce_repeated_arg_type_style.go
@@ -73,7 +73,7 @@ func (r *EnforceRepeatedArgTypeStyleRule) configure(arguments lint.Arguments) er
 			case "funcArgStyle":
 				val, ok := v.(string)
 				if !ok {
-					return fmt.Errorf("Invalid map value type for 'enforce-repeated-arg-type-style' rule. Expecting string, got %T", v)
+					return fmt.Errorf("invalid map value type for 'enforce-repeated-arg-type-style' rule. Expecting string, got %T", v)
 				}
 				valstyle, err := repeatedArgTypeStyleFromString(val)
 				if err != nil {
@@ -83,7 +83,7 @@ func (r *EnforceRepeatedArgTypeStyleRule) configure(arguments lint.Arguments) er
 			case "funcRetValStyle":
 				val, ok := v.(string)
 				if !ok {
-					return fmt.Errorf("Invalid map value '%v' for 'enforce-repeated-arg-type-style' rule. Expecting string, got %T", v, v)
+					return fmt.Errorf("invalid map value '%v' for 'enforce-repeated-arg-type-style' rule. Expecting string, got %T", v, v)
 				}
 				argstyle, err := repeatedArgTypeStyleFromString(val)
 				if err != nil {
@@ -91,7 +91,7 @@ func (r *EnforceRepeatedArgTypeStyleRule) configure(arguments lint.Arguments) er
 				}
 				r.funcRetValStyle = argstyle
 			default:
-				return fmt.Errorf("Invalid map key for 'enforce-repeated-arg-type-style' rule. Expecting 'funcArgStyle' or 'funcRetValStyle', got %v", k)
+				return fmt.Errorf("invalid map key for 'enforce-repeated-arg-type-style' rule. Expecting 'funcArgStyle' or 'funcRetValStyle', got %v", k)
 			}
 		}
 	default:
diff --git a/rule/exported.go b/rule/exported.go
index 39929cbec..87bdd4e20 100644
--- a/rule/exported.go
+++ b/rule/exported.go
@@ -96,7 +96,7 @@ func (r *ExportedRule) configure(arguments lint.Arguments) error {
 			case "disableChecksOnVariables":
 				r.disabledChecks.Var = true
 			default:
-				return fmt.Errorf("Unknown configuration flag %s for %s rule", flag, r.Name())
+				return fmt.Errorf("unknown configuration flag %s for %s rule", flag, r.Name())
 			}
 		default:
 			return fmt.Errorf("invalid argument for the %s rule: expecting a string, got %T", r.Name(), flag)
diff --git a/rule/import_alias_naming.go b/rule/import_alias_naming.go
index ab5563cb0..43bf9d545 100644
--- a/rule/import_alias_naming.go
+++ b/rule/import_alias_naming.go
@@ -47,7 +47,7 @@ func (r *ImportAliasNamingRule) configure(arguments lint.Arguments) error {
 				}
 
 			default:
-				return fmt.Errorf("Invalid map key for 'import-alias-naming' rule. Expecting 'allowRegex' or 'denyRegex', got %v", k)
+				return fmt.Errorf("invalid map key for 'import-alias-naming' rule. Expecting 'allowRegex' or 'denyRegex', got %v", k)
 			}
 		}
 	default:
diff --git a/rule/receiver_naming.go b/rule/receiver_naming.go
index 0dd415b72..54eee4eff 100644
--- a/rule/receiver_naming.go
+++ b/rule/receiver_naming.go
@@ -26,7 +26,7 @@ func (r *ReceiverNamingRule) configure(arguments lint.Arguments) error {
 
 	args, ok := arguments[0].(map[string]any)
 	if !ok {
-		return fmt.Errorf("Unable to get arguments for rule %s. Expected object of key-value-pairs", r.Name())
+		return fmt.Errorf("unable to get arguments for rule %s. Expected object of key-value-pairs", r.Name())
 	}
 
 	for k, v := range args {
@@ -34,11 +34,11 @@ func (r *ReceiverNamingRule) configure(arguments lint.Arguments) error {
 		case "maxLength":
 			value, ok := v.(int64)
 			if !ok {
-				return fmt.Errorf("Invalid value %v for argument %s of rule %s, expected integer value got %T", v, k, r.Name(), v)
+				return fmt.Errorf("invalid value %v for argument %s of rule %s, expected integer value got %T", v, k, r.Name(), v)
 			}
 			r.receiverNameMaxLength = int(value)
 		default:
-			return fmt.Errorf("Unknown argument %s for %s rule", k, r.Name())
+			return fmt.Errorf("unknown argument %s for %s rule", k, r.Name())
 		}
 	}
 	return nil
diff --git a/rule/unchecked_type_assertion.go b/rule/unchecked_type_assertion.go
index dc14afc47..2f25a9a95 100644
--- a/rule/unchecked_type_assertion.go
+++ b/rule/unchecked_type_assertion.go
@@ -14,21 +14,21 @@ const (
 	ruleUTAMessageIgnored = "type assertion result ignored"
 )
 
-// UncheckedTypeAssertionRule lints missing or ignored `ok`-value in dynamic type casts.
-type UncheckedTypeAssertionRule struct {
+// uncheckedTypeAssertionRule lints missing or ignored `ok`-value in dynamic type casts.
+type uncheckedTypeAssertionRule struct {
 	acceptIgnoredAssertionResult bool
 
 	configureOnce sync.Once
 }
 
-func (r *UncheckedTypeAssertionRule) configure(arguments lint.Arguments) error {
+func (r *uncheckedTypeAssertionRule) configure(arguments lint.Arguments) error {
 	if len(arguments) == 0 {
 		return nil
 	}
 
 	args, ok := arguments[0].(map[string]any)
 	if !ok {
-		return errors.New("Unable to get arguments. Expected object of key-value-pairs")
+		return errors.New("unable to get arguments. Expected object of key-value-pairs")
 	}
 
 	for k, v := range args {
@@ -36,17 +36,17 @@ func (r *UncheckedTypeAssertionRule) configure(arguments lint.Arguments) error {
 		case "acceptIgnoredAssertionResult":
 			r.acceptIgnoredAssertionResult, ok = v.(bool)
 			if !ok {
-				return fmt.Errorf("Unable to parse argument '%s'. Expected boolean", k)
+				return fmt.Errorf("unable to parse argument '%s'. Expected boolean", k)
 			}
 		default:
-			return fmt.Errorf("Unknown argument: %s", k)
+			return fmt.Errorf("unknown argument: %s", k)
 		}
 	}
 	return nil
 }
 
 // Apply applies the rule to given file.
-func (r *UncheckedTypeAssertionRule) Apply(file *lint.File, arguments lint.Arguments) []lint.Failure {
+func (r *uncheckedTypeAssertionRule) Apply(file *lint.File, arguments lint.Arguments) []lint.Failure {
 	var configureErr error
 	r.configureOnce.Do(func() { configureErr = r.configure(arguments) })
 
@@ -56,7 +56,7 @@ func (r *UncheckedTypeAssertionRule) Apply(file *lint.File, arguments lint.Argum
 
 	var failures []lint.Failure
 
-	walker := &lintUncheckedTypeAssertion{
+	walker := &lintuncheckedTypeAssertion{
 		onFailure: func(failure lint.Failure) {
 			failures = append(failures, failure)
 		},
@@ -69,11 +69,11 @@ func (r *UncheckedTypeAssertionRule) Apply(file *lint.File, arguments lint.Argum
 }
 
 // Name returns the rule name.
-func (*UncheckedTypeAssertionRule) Name() string {
+func (*uncheckedTypeAssertionRule) Name() string {
 	return "unchecked-type-assertion"
 }
 
-type lintUncheckedTypeAssertion struct {
+type lintuncheckedTypeAssertion struct {
 	onFailure                        func(lint.Failure)
 	acceptIgnoredTypeAssertionResult bool
 }
@@ -91,14 +91,14 @@ func isTypeSwitch(e *ast.TypeAssertExpr) bool {
 	return e.Type == nil
 }
 
-func (w *lintUncheckedTypeAssertion) requireNoTypeAssert(expr ast.Expr) {
+func (w *lintuncheckedTypeAssertion) requireNoTypeAssert(expr ast.Expr) {
 	e, ok := expr.(*ast.TypeAssertExpr)
 	if ok && !isTypeSwitch(e) {
 		w.addFailure(e, ruleUTAMessagePanic)
 	}
 }
 
-func (w *lintUncheckedTypeAssertion) handleIfStmt(n *ast.IfStmt) {
+func (w *lintuncheckedTypeAssertion) handleIfStmt(n *ast.IfStmt) {
 	ifCondition, ok := n.Cond.(*ast.BinaryExpr)
 	if ok {
 		w.requireNoTypeAssert(ifCondition.X)
@@ -106,7 +106,7 @@ func (w *lintUncheckedTypeAssertion) handleIfStmt(n *ast.IfStmt) {
 	}
 }
 
-func (w *lintUncheckedTypeAssertion) requireBinaryExpressionWithoutTypeAssertion(expr ast.Expr) {
+func (w *lintuncheckedTypeAssertion) requireBinaryExpressionWithoutTypeAssertion(expr ast.Expr) {
 	binaryExpr, ok := expr.(*ast.BinaryExpr)
 	if ok {
 		w.requireNoTypeAssert(binaryExpr.X)
@@ -114,19 +114,19 @@ func (w *lintUncheckedTypeAssertion) requireBinaryExpressionWithoutTypeAssertion
 	}
 }
 
-func (w *lintUncheckedTypeAssertion) handleCaseClause(n *ast.CaseClause) {
+func (w *lintuncheckedTypeAssertion) handleCaseClause(n *ast.CaseClause) {
 	for _, expr := range n.List {
 		w.requireNoTypeAssert(expr)
 		w.requireBinaryExpressionWithoutTypeAssertion(expr)
 	}
 }
 
-func (w *lintUncheckedTypeAssertion) handleSwitch(n *ast.SwitchStmt) {
+func (w *lintuncheckedTypeAssertion) handleSwitch(n *ast.SwitchStmt) {
 	w.requireNoTypeAssert(n.Tag)
 	w.requireBinaryExpressionWithoutTypeAssertion(n.Tag)
 }
 
-func (w *lintUncheckedTypeAssertion) handleAssignment(n *ast.AssignStmt) {
+func (w *lintuncheckedTypeAssertion) handleAssignment(n *ast.AssignStmt) {
 	if len(n.Rhs) == 0 {
 		return
 	}
@@ -150,21 +150,21 @@ func (w *lintUncheckedTypeAssertion) handleAssignment(n *ast.AssignStmt) {
 }
 
 // handles "return foo(.*bar)" - one of them is enough to fail as golang does not forward the type cast tuples in return statements
-func (w *lintUncheckedTypeAssertion) handleReturn(n *ast.ReturnStmt) {
+func (w *lintuncheckedTypeAssertion) handleReturn(n *ast.ReturnStmt) {
 	for _, r := range n.Results {
 		w.requireNoTypeAssert(r)
 	}
 }
 
-func (w *lintUncheckedTypeAssertion) handleRange(n *ast.RangeStmt) {
+func (w *lintuncheckedTypeAssertion) handleRange(n *ast.RangeStmt) {
 	w.requireNoTypeAssert(n.X)
 }
 
-func (w *lintUncheckedTypeAssertion) handleChannelSend(n *ast.SendStmt) {
+func (w *lintuncheckedTypeAssertion) handleChannelSend(n *ast.SendStmt) {
 	w.requireNoTypeAssert(n.Value)
 }
 
-func (w *lintUncheckedTypeAssertion) Visit(node ast.Node) ast.Visitor {
+func (w *lintuncheckedTypeAssertion) Visit(node ast.Node) ast.Visitor {
 	switch n := node.(type) {
 	case *ast.RangeStmt:
 		w.handleRange(n)
@@ -185,7 +185,7 @@ func (w *lintUncheckedTypeAssertion) Visit(node ast.Node) ast.Visitor {
 	return w
 }
 
-func (w *lintUncheckedTypeAssertion) addFailure(n *ast.TypeAssertExpr, why string) {
+func (w *lintuncheckedTypeAssertion) addFailure(n *ast.TypeAssertExpr, why string) {
 	s := fmt.Sprintf("type cast result is unchecked in %v - %s", gofmt(n), why)
 	w.onFailure(lint.Failure{
 		Category:   "bad practice",
diff --git a/rule/var_naming.go b/rule/var_naming.go
index a8e15756c..5d3bf1ad7 100644
--- a/rule/var_naming.go
+++ b/rule/var_naming.go
@@ -55,14 +55,14 @@ func (r *VarNamingRule) configure(arguments lint.Arguments) error {
 		thirdArgument := arguments[2]
 		asSlice, ok := thirdArgument.([]any)
 		if !ok {
-			return fmt.Errorf("Invalid third argument to the var-naming rule. Expecting a %s of type slice, got %T", "options", arguments[2])
+			return fmt.Errorf("invalid third argument to the var-naming rule. Expecting a %s of type slice, got %T", "options", arguments[2])
 		}
 		if len(asSlice) != 1 {
-			return fmt.Errorf("Invalid third argument to the var-naming rule. Expecting a %s of type slice, of len==1, but %d", "options", len(asSlice))
+			return fmt.Errorf("invalid third argument to the var-naming rule. Expecting a %s of type slice, of len==1, but %d", "options", len(asSlice))
 		}
 		args, ok := asSlice[0].(map[string]any)
 		if !ok {
-			return fmt.Errorf("Invalid third argument to the var-naming rule. Expecting a %s of type slice, of len==1, with map, but %T", "options", asSlice[0])
+			return fmt.Errorf("invalid third argument to the var-naming rule. Expecting a %s of type slice, of len==1, with map, but %T", "options", asSlice[0])
 		}
 		r.allowUpperCaseConst = fmt.Sprint(args["upperCaseConst"]) == "true"
 		r.skipPackageNameChecks = fmt.Sprint(args["skipPackageNameChecks"]) == "true"
@@ -286,7 +286,7 @@ func getList(arg any, argName string) ([]string, error) {
 	for _, v := range args {
 		val, ok := v.(string)
 		if !ok {
-			return nil, fmt.Errorf("Invalid %s values of the var-naming rule. Expecting slice of strings but got element of type %T", val, arg)
+			return nil, fmt.Errorf("invalid %s values of the var-naming rule. Expecting slice of strings but got element of type %T", val, arg)
 		}
 		list = append(list, val)
 	}